Indonesia Conference Directory

Corresponding Author
Tedy Agung Cahyadi

Institutions
Lecturer of Mining Engineering of Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia Jalan SWK 104, Sleman, 55283, Indonesia

Student of Bachelor Mining Engineering of Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia Jalan SWK 104, Sleman, 55283, Indonesia

Mine Plan Engineer, PT Bumi Suksesindo, Banyuwangi, Indonesia

Abstract
Indonesia is a country rich in natural resources, especially gold resources. Gold mining in Indonesia is commonly using open pit and underground mining system. Although underground mining is not directly connected with weather and rainfall, that does not make an underground mining free of mine dewatering system-s problem. The problems that may be occurred in the working front area of an underground mine are the high of the total head that has to be lifted by a pump, dimension of the mine channel and sump that small due to limited space of the tunnel, and flood. Flooding in a tunnel commonly caused by groundwater on the tunnel-s surroundings. An accurate calculation of groundwater inflow into the tunnel is important to design the underground mine dewatering system. Measurement of actual groundwater inflow had been done to prove the accuracy of groundwater inflow-s calculation using an analytical solution by El Tani method. This paper presents the alternative of the groundwaters seepage calculation those flows into the tunnel. The result of this research is the groundwater inflow can be predicted using an analytical solution accurately so that the design of the underground mine dewatering system can be held precisely

Keywords
Mine Dewatering, Pump Network, Seepage, Total Head, Working Front Area

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/Mx9zj43KYfhU

Corresponding Author
Wrego Seno

Institutions
Geophysical Engineering Departement, Faculty of Mineral Technology, UPN “Veteran” Yogyakarta

Abstract
Karangsambung regions is located in Kebumen District of Central Java Province which morphologically is composed of sloping montains and hills, therefore Karangsambung region has landslide hazard potentials.Ground Penetrating Radar (GPR) methods has conducted in these research to delineating slip plane of landslides potential areas as the base of landslide potential assesments. GPR measurements consists of four lines which has a length of 170 - 550 meters than the field data has processed to produce the radargram section. The radargram section has interpreted to delineating slip plane of landslides, and as the results slip plane has detected in the depth between 5 - 20 meters from surface and has potential of landslides occur.

Keywords
Landslides, Slip Plane, GPR Methods

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/n2Kvd6ExNrMm

Corresponding Author
Rizqi Prastowo

Institutions
(a) Institut Teknologi Naisonal Yogyakarta, Jalan Babarsari, Caturtunggal, Depok, Sleman, Yogyakarta
(b) Institut Teknologi Sumatera, Ryacudu Bypass, Way Hui, Jati Agung, South Lampung, Indonesia
*vico.luthfi[at]fi.itera.ac.id
(c) Kwansei Gakuin University, japan

Abstract
Jati Agung District is an area planned by the Lampung government to become a new city of the central government in Lampung. Aspects of city planning include aesthetics and safety. The geophysical study is conducted as disaster mitigation efforts to make the city have a good level of safety. The purpose of this study is to measure earthquake activities in the research areas that could be developed as data in disaster mitigation. The geophysical study was conducted by measuring the microtremor at 15 points. The microtremor signal is processed by the HVSR method to obtain information on natural frequency and amplitude. Natural frequencies and amplifications were analyzed to obtain the Peak Ground Acceleration (PGA) and Ground Shear Strain values. The results of PGA values and Ground Shear Strains indicate indications of soil fracture-prone areas. The results showed that the PGA value was 12.34638 gal to 22.18974 gal, while the Ground Shear Strain value was 53.34322x10-6 to 729.6847x10-6.

Keywords
Earthquake; geophysics; PGA; Ground Shear Strain; microtremor

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/ENADMBLJga3Q

Corresponding Author
BIMA PRABAWA DEWA GEDE

Institutions
(a) Institut Teknologi Naisonal Yogyakarta, Jalan Babarsari, Caturtunggal, Depok, Sleman, Yogyakarta (b) Institut Teknologi Sumatera, Ryacudu Bypass, Way Hui, Jati Agung, South Lampung, Indonesia (c) Kwansei Gakuin University, japan
*vico.luthfi[at]fi.itera.ac.id

Abstract
Jati Agung District is an area planned by the Lampung government to become a new city of the central government in Lampung. Aspects of city planning include aesthetics and safety. The geophysical study is conducted as disaster mitigation efforts to make the city have a good level of safety. The purpose of this study is to measure earthquake activities in the research areas that could be developed as data in disaster mitigation. The geophysical study was conducted by measuring the microtremor at 15 points. The microtremor signal is processed by the HVSR method to obtain information on natural frequency and amplitude. Natural frequencies and amplifications were analyzed to obtain the Peak Ground Acceleration (PGA) and Ground Shear Strain values. The results of PGA values and Ground Shear Strains indicate indications of soil fracture-prone areas. The results showed that the PGA value was 12.34638 gal to 22.18974 gal, while the Ground Shear Strain value was 53.34322x10-6 to 729.6847x10-6.

Keywords
Earthquake; geophysics; PGA; Ground Shear Strain; microtremor

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/UtTp4bGEx9YK

Corresponding Author
Riza Fahmi

Institutions
1Research Group of Earth Resource Exploration, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology (ITB), Indonesia, Ganesha 10, Bandung, Indonesia
2Research Group of Petrology, Volcanology, and Geochemistry, Faculty of Earth Sciences and Technology, Bandung Institute of Technology (ITB), Indonesia, Ganesha 10, Bandung, Indonesia
Corresponding author*: rizafahmi90[at]gmail.com

Abstract
Alteration is the key aspect in exploration, after alteration model in one prospect area has been determined. It could be reference to us how to find information for the next analysis to find any prospect area for mining. The important aspect for determining alteration zone was mineral associations in the rock samples. It was a challenge for the explorer to determine the alteration not only based on the theory, but also how the laboratory testing was managed properly. In this paper, we demontrated a process how the alteration in selected area could be interpreted from field investigation and delineated alteration zone based on mineral association. The petrography and XRD analyses were performed to confirm field investigation. The analyses were used to determine the information about alteration intensity, primary, and secondary mineral. Each petrography and XRD sample testing result was interpreted to identify the alteration zone. Following the Petrography and XRD analyses, we classified the mineral association to five areas, Lawe Sikap, Lawe Pinish, Salim Pinim, Nembak Alas, and Lawe Sigala.The alteration zones in the five areas were dominated by Skarn, Prophylitic, Advance Argillic, and Phylic.

Keywords
Alteration, Exploration, Petrography, XRD, Interpretation

Topic
Geology

Link: https://ifory.id/abstract/Jk3ATrbxvDyX

Corresponding Author
sofyan rahman

Institutions
university of trisakti

Abstract
Abstract In the tunnel construction process, good planning is needed regarding the support system that matches the rock class in the tunnel. One of the support systems is shotcrete. Shotcrete is a mortar that is sprayed with high strength towards a surface. However, to get the thickness of the required shotcrete, the rock class in the tunnel must be obtained. To find out this, an empirical method is needed that approaches the rock mass classification. Based on the analysis that has been done, there is 1 type of lithology that is traversed in the tunnel, namely metamorphic rock in the form of schist with RMR ranging from 39-50 and high debris load of 4.27-3.5 meters.

Keywords
tunnel, support system , RMR, high debris load

Topic
Geology

Link: https://ifory.id/abstract/c9qkdA4FvLng

Corresponding Author
Panca Suci Widiantoro

Institutions
(a)Program Studi Teknik Perminyakan , Akademi MIGAS Balongan, Indramayu.
(b)Program Studi Teknik Perminyakan, Fakultas Teknologi Mineral, UPN “Veteran” Yogyakarta.

Abstract
Gas Well PCA was produced in February 1994. This well is produced commingle of 2 reservoirs A and B. DST result shows both two reservoirs have contrast deliverability. The last production test shows gas rate 7.28 MMSCFD. This well purposed to further workover program to obtained optimum recovery. Integrated production modelling is essential for well performance analysis, enhancement of the production system. Gas well performance cannot be analyzed without considering the reservoir, the flowline and the processing facility, as each of these components affect the operation of the entire production network. This study will take into account the effect of comingle of 2 layers with contrast deliverability by building integrated production model. The Inflow Performance Relationship (IPR) Curve will be analyzed each reservoir to know each production performance. History matching analyses also performed to check the reliability of model in dynamic condition. To achieve the accurate history matching results, the simulation model was run based on the available historical production data. Based on this study, current recovery of A reservoir was 55%, B reservoir was 75% and reservoir B already water out. It is recommended to do workover on this well by isolate reservoir B then re-perforate reservoir A and produce gas only from reservoir A to get optimum recovery.

Keywords
Commingle Gas Well, Integrated production modeling, Workover

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/pafzkJGuh8yW

Corresponding Author
Waterman Sulistyana Bargawa

Institutions
1Master of Mining Engineering, UPN Veteran Yogyakarta, Jl. SWK 104 Yogyakarta Indonesia
2Department of Mining Engineering, UPN Veteran Yogyakarta, Jl. SWK 104 Yogyakarta Indonesia

Abstract
Modeling and estimation of ore grade are very essential in geostatistical ore resources estimation. Resource modeling is generally carried out on gold, copper, nickel and bauxite ores. This study applies the geostatistical method for modeling and estimation of iron ore grade. The objective of the study is to apply estimation techniques (OK, ordinary kriging; IDW, inverse distance weighting, and NNP, nearest neighbor polygon) and evaluate the accuracy of these techniques in iron ore resources. This study uses detailed exploration, which are 68 drill holes with 170 iron ore grade composite data. In the iron ore resources estimation, block modeling method is applied. The results showed RMSE (root mean square error) values of various estimation techniques. Based on statistical analysis, visualization of comparisons between borehole data and models, and probability plots, the accuracy of each iron ore resource estimation technique in the study area can be determined. All estimation techniques have the same accuracy on low CV (coefficient of variance) values. The relative kriging standard deviation values determine the classification of measured iron ore resources.

Keywords
iron ore, resource, modeling, geostatistics, kriging

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/J6tU4GRxzmgC

Corresponding Author
Arip Munawir

Institutions
UPN Veteran Yogyakarta - Master Program in Management Disaster

Abstract
Karawang Regency in Regional Regulation (Perda) No.2 of 2013 concerning Regional Spatial Planning (RTRW) 2011-2031 in Article 54 mandates the development of industrial strategic areas in Telukjambe (Kec. Telukjambe Barat, Timur and Ciampel). Karawang in January 2014 experienced flooding at several points resulting from the overflow of the Cibeet River and the Citarum River. Distribution of this flood occurred in the district Telukjambe West, East, Ciampel, Karawang West and East. Underground river systems and cave networks in the Jatiluhur Formation have the potential to reduce the discharge load from existing surface rivers. Cave systems and underground rivers in the Kuta Tandingan Hills can reduce surface runoff by up to 80%. The porosity of the Kuta Tandingan Hills can reduce surface flow by 21%. The peak load of the Citalahab River occurs at the beginning of the river where the channel is narrow, but the additional load from the surface flow is so large.

Keywords
Karawang, Regional Spatial Planning, Industrial Area, Jatiluhur Formation, Kuta Tandingan Hills, Underground River, Cave, Porosity, Run Off, River, Peak Load.

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/rC7azkweH24N

Corresponding Author
Bayu Satiyawira

Institutions
Universitas Trisakti

Abstract
Drilling mud is the most important part in drilling activity. Drilling could work fluently, save, and economical on fluence by system and condition of drilling mud. It means the mud system and the physical properties of the slurry conform to the required specifications. There are some kind of drilling mud that can be use on oil and gas drilling operation, such as water base mud and oil base mud. In terms of economical, water base mud is usually use in drilling process. The purpose of this study is to find conducted laboratory research of the effect of differences temperature for characteristic mud system of low solid mud with adding biopolimer and bentonite extender. This research used roller oven method as a medium for simulation to condition the mud as if to be in the well to see the change of physical properties of sludge at differences temperature. The result is found that the higher the temperature, the drilling mud physical properties like density, viscosity, plastic viscosity, yield point, dial reading 600 RPM, dial reading 300 RPM, and gel strenght decrease. But not all the physical properties decreased.

Keywords
LABORATORY STUDY OF THE EFFECT OF VARIOUS TEMPERATURES ON THE PHYSICAL PROPERTIES OF LOW SOLID MUD SYSTEMS

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/EgvrAMW63FY4

Corresponding Author
Andry Prima

Institutions
Universitas Trisakti
Faculty of Earth Technology and Energy
Petroleum Department,

Abstract
Drilling mud is the most important part in drilling activity. Drilling could work fluently, safely, and economically on fluency by system and condition of drilling mud. It means the mud system and the physical properties of the slurry conform to the required specifications. There are some kinds of drilling mud that can be used in oil and gas drilling operation, such as water base mud and oil base mud. In terms of economical objective, water base mud is usually used in drilling process. The purpose of this study is to conduct laboratory research of the effect of various temperatures on the characteristic of mud system of low solid mud by adding biopolymer and bentonite extender. This research uses roller oven method as a medium for simulation to condition the mud as close as possible to the condition in wellbore to see the change of physical properties of sludge at various temperatures. The result found is that the higher the temperature, the lower the drilling mud physical properties such as density, viscosity, plastic viscosity, yield point, dial reading 600 RPM, dial reading 300 RPM, and gel strength. However, it is found that not all the physical properties decrease.

Keywords
drillig mud, bentonite, extender, mud cake, polymer, pH, laboratory study

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/gamcL439YGFA

Corresponding Author
Afiat Anugrahadi

Institutions
a) Geological Engineering Department, FTKE Universitas Trisakti, Jakarta, Indonesia
*afiat[at]trisakti.ac.id
b) Mining Engineering Department, FTKE Universitas Trisakti, Jakarta, Indonesia

Abstract
The Palu earthquake on 28 October 2018 not only destroyed the facilities and infrastructure of human life in the Palu area and its surroundings, but also geological aspect. The earthquake geologically not only caused land and rock movements, tsunamis, and geological damage such as the formation of new faults and fractures, but liquefaction also occurred. The geological survey was carried out five days after the earthquake, the data and information obtained were used to analyze geological impacts of the earthquake. Visually, it is clear the movement of land and rocks on the surface of the earths earth around Palu with the collapse and collapse of houses, hotels and various human settlements. Activation of faults and fractures has caused a shift in the road lane in Palu - Donggala. Subsidence was caused by active faults, especially Palu-Koro fault, as an impact of the Palu tectonic earthquake between 0.5 - 2.5 meters.

Keywords
Earthquake; Palu; Fault; Subsidence.

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/3ZGnN4uP9LDA

Corresponding Author
Gracio Haggai

Institutions
1
Program Studi Teknik Pertambangan, Fakultas Teknologi Kebumian dan Energi,
Universitas Trisakti, Jalan Kyai Tapa No.1, Tomang, Grogol Petamburan,
Jakarta Barat, Daerah Khusus Ibukota Jakarta 11440

2.
Dosen Program Studi Teknik Pertambangan, Fakultas Teknologi Kebumian dan Energi,
Universitas Trisakti, Jalan Kyai Tapa No.1, Tomang, Grogol Petamburan,
Jakarta Barat, Daerah Khusus Ibukota Jakarta 11440

Abstract
According to Landslide Threat Map 2016 prepared by BPBD-s Keumen, all districts in Kebumen is a high-potential areas of landslides. Therefore, we need more detailed mapping area regarding the area prone to landslide. In this study, Anbaagan method (1992) is used to analyze landslide zoning prone. Anbalagan method calculates six factors causing landslides, such as slope degre, wetness, vegetation density, structure, rocks, and relatif relief. Kedungwaru is a villagelocated in District Karangsambung, Kebumen, Central Java and geographically S 7 ° 35 557 , E 109 ° 40 011.The research result in Kedungwaru village tells there are two zones prone to landslides. First, the 48,5% low hazard prone zone in Kerajan, Rawajmambe, Kaliwadas and Gayam village. Second, the 51,5% medium hazard prone zone in Tegalsari village.

Keywords
Landslide, Photogrametry,GIS

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/VMCeFAGbwpWd

Corresponding Author
Herlando Bubala

Institutions
UPN "Veteran" Yogyakarta

Abstract
The settling pond is a reservoir of water from the mining area which carries it heavy metal particles to be sedimentation first before its flowing out of the area mining. so that it does not cause pollution. The problem in this research area is Dimensions of the setting pond could not accommodate incoming water discharge when rainfall is high, and it makes the water overflows and directly enter the coastal waters so it is indicated to arise heavy metal pollution. The purposes of this research are to examine the dimensions of the settling pond, determine erosion hazard level and countermeasures carried out. In accordance with the rainfall data, it can calculation of the mine drainage system is carried out, namely (1) The planned rainfall using the Gumbel method obtained at 156,046 mm/day. (2) The intensity of rainfall was obtained at 28,731 mm/hour. (3) The catchment area is DTH I with an area of 0,43 km2, DTH II with an area of 0,11 km2, DTH III covering an area of 0,43 km2, (4) runoff discharge obtained by DTH I of 2,36 m3/sec, DTH II of 0,79 m3/sec, and DTH III of 2,66 m3/sec . (5) The total discharge of runoff water from 3 DTH so that it was obtained at 5,82 m3/sec. According to the discharger and settling speed of 0.000997 m/sec, the settling area is obtained the pond is 5839,46 m2 and the settling pond volume is 23.520 m3 with 4 m inside the volume is greater than the actual volume in the field. Another cause is erosion so that runoff water flows directly into the pond settling without going through open channels which causes fast water, this is evidenced by the calculation of erosion hazard levels with the USLE equation the average erosion rate (A) is 540,5646 tons/ha/year so that it is included in class V with erosion hazard level in very heavy category (B). Then the countermeasures are carried out by revegetation on the slope so that if revegetation has been carried out then the average value erosion rate (A) is 172,98 tons/ha/year so the erosion hazard level is reduced to class III with medium category (S).

Keywords
rainfall, settling pond, erosion, revegetation

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/mYJTvueL96wC

Corresponding Author
Purbudi Wahyuni

Institutions
a) Faculty of Economics and Business, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta 55283, Indonesia
*purbudiwahyuni11[at]gmail.com
b) Disaster Management, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. Babarsari 2 Yogyakarta 55281 (Campus Unit II), Indonesia

Abstract
Floods and landslides pose a danger in the Sungai Gajah Wong regions, Yogyakarta where the area is situated at densely populated area with narrow road access. The disaster can lead to several casualties, causing the destruction of public and private infrastructure, as well as hitting thousands of households. By using SWOT analysis, this paper identifies the local wisdom called Mundur Munggah Madhep Kali (M3K) by conducting in-depth interviews involving stakeholders and affected communities. There has even been a MoU between the government and affected communities accompanied by Gajah Wong FORSIDAS. The target of affected communities is about more than a thousand households where they live on state land. At present, there were 247 households that are aware and willing to comply with government policies and implement the Mundur Munggah Madhep Kali. Resultantly, this action is to protect households, economic facilities, and transport infrastructure, as well as help the stakeholders and decision makers in order disaster mitigation effort through a policy planning and action.

Keywords
Reconstruction Management, Disaster Mitigation, SWOT Analysis, Local Wisdom, Mundur Munggah Madhep Kali, Gajah Wong River

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/wnYzc7yedqF9

Corresponding Author
Reza Aryanto

Institutions
1
Program Studi Teknik Pertambangan, Fakultas Teknologi Kebumian dan Energi,
Universitas Trisakti, Jalan Kyai Tapa No.1, Tomang, Grogol Petamburan,
Jakarta Barat, Daerah Khusus Ibukota Jakarta 11440

2
Dosen Program Studi Teknik Pertambangan, Fakultas Teknologi Kebumian dan Energi,
Universitas Trisakti, Jalan Kyai Tapa No.1, Tomang, Grogol Petamburan,
Jakarta Barat, Daerah Khusus Ibukota Jakarta 11440

Abstract
Indonesia is a country that has a tropical climate. Countries that have a tropical climate only have two seasons namely the rainy season and the dry season. During the rainy season, most of the water falling in the village of Kedungwaru goes to the drainage channel which is wasted into the river, and some of the rainwater is absorbed by the soil in an area called infiltration. Rainfall when in the field is quite high, and this greatly affects the infiltration of land in the area. If the soil ability to absorb water is not in accordance with the rainfall, the soil will not be able to seep into the water and the water will pool. This is due to the constant infiltration rate of the percolation rate through the soil. Because of this phenomenon, this area is a difficult challenge, flood, landslide. Therefore the mapping of infiltration rate in Kedungwaru village is used to determine the rate of infiltration and can be used to measure and control the conditions so that the extreme negative can be prevented.

Keywords
infiltration, water, rain

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/KZRpgP8VyELJ

Corresponding Author
Ajimas Pascaning Setiahadiwibowo

Institutions
1Departement of Geophysical Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia
Jl. SWK No. 104, Ngropoh, Condongcatur, Depok Subdistrict, Sleman Regency, Special Region of Yogyakarta 55283
2Meteorology Climatology and Geophysics Agency Yogyakarta, Indonesia
Jl. Wates KM 8 Jitengan Balecatur, Gamping Subdistrict,, Sleman Regency, Special Region of Yogyakarta 55295

Abstract
Yogyakarta is one of the earthquake-prone areas because it lies near subduction area, the last recorded occurrence of large intensity earthquake activity on 2006, May 27th had a magnitude of 5.9 SR (Richter Scale) and suffered considerable damage. The Department of Social Affairs said that 6,234 people died, 36,299 people were injured and about 1.5 million people were displaced by the earthquake. The earthquake also caused damage to 616,458 residential building units in Yogyakarta and Central Java. Under the USGS, the epicenter of the earthquake is about 25 km southeast of Yogyakarta with a depth of 17.1 km below sea level. Microtremor data with HVSR (Horizontal to Vertical Spectral Ratio) method can be used to determine the value of the predominant frequency spectrum (fo) and amplification factor (A) which describes the dynamic characteristics of the soil. The HVSR analysis method was developed to calculate the ratio of the Fourier spectrum of the microtremor signal to the horizontal component against its vertical component. Calculations regarding the value of soil vulnerability and analysis of subsurface structures are intended to determine the level of vulnerability of an area to earthquake hazards. In the Piyungan sub-district the thickness of the sediment layer (H) ranges from 5 meters to 75 meters below the surface. The northern part of Piyungan sub-district tends to have a thick layer of sediment which is quite thick reaching 45 meters to 75 meters. While the value of the soil vulnerability index in most of the northern part of the study area has a land vulnerability index value that tends to be greater than 40 x 10-6 s2/cm with a maximum value of 78.62 x 10-6 s2/cm. Most of the study areas have soft soil types (Vs < 175 m/s), medium soils (175 m/s < Vs ≤ 350 m/s) and very dense soils and soft rocks (350 m/s < Vs ≤ 750 m/s).

Keywords
Microsroseismic, Horizontal to Vertical Spectral Ratio,Ellipticity Curve, Sediment Layer Thickness.

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/kD7raBteNHng

Corresponding Author
Sutarto Sutarto

Institutions
1)Universitas Pembangunan Nasional “Veteran” Yogyakarta
2)Universitas Gadjah Mada Yogyakarta
3)RWTH Aachen University Germany

Abstract
The Randu Kuning Porphyry Cu-Au prospect area is situated at Selogiri district, Wonogiri regency, Central Java, Indonesia, approximately 70 km east of Yogyakarta city. The area is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation and many dioritic intrusive rocks of the Late Eocene-Early Miocene magmatism. Porphyry Cu-Au and intermediate sulphidation epithermal Au-base metals mineralisation at Randu Kuning have strong genetic correlation with the magmatism-volcanism processes. The mineralized dioritic intrusive rocks at the area, are distributed at the centre of the depression of an ancient volcanic crater. There are many intermediate sulphidation epithermal prospect area sourrounding the Randu Kuning porphyry Cu-Au. Most mineralizations both porphyry and epithermal environments are associated with the present of quartz- sulphides veins, but not all porphyry vein types contribute in copper and gold mineralization. The early quartz-magnetite veins (particularly A and M vein types) generally not contain Cu-Au or barren, while the later sulphide bearing veins such as quartz-sulphides (AB type) veins, chalcopyrite-pyrite (C type) veins, quartz-sulphides-carbonate (D type) veins are mineralized. Mineralization contain copper and gold deposits in range at about 0.66-5.7 g/t Au and 0.04-1.24 % Cu. Whereas the epithermal level, mineralization mostly related with the present of pyrite+sphalerite+chalcopyrite+quartz+carbonate veins and hydrothermal breccias. The epithermal veins and breccia lead to the occurences of silver, zinc and lead mineralization, it commonly contain around 0.4-1.53 g/t Au, 0.8-8.5 g/t Ag, 0.17-0.39% Cu, 0.003-0.37% Zn, 00089-0.14% Pb. In porphyry environment, copper and gold are likely transported together as chloride complexes (CuCl0 and AuCl2-) in magnetite stability field. The chlorite complexes then react with existing magnetite to produce free gold and chalcopyrite. On the other hand, the epithermal environment, gold and copper usually are transported in a different ion complexes. Au is transported as the thio complexe [Au(HS)2-; Au2(HS)2-S2- and HAu(HS)2-] in phyrite stability field, while Cu is preferably transported as chloride complex in the hematite stability field.

Keywords
Mineralization style, Porphyry, Epithermal, vein, hydrothermal breccia

Topic
Geology

Link: https://ifory.id/abstract/DTzjMKedrLxV

Corresponding Author
sutarto sutarto

Institutions
1)Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia
2)Universitas Gadjah Mada Yogyakarta, Indonesia
3)RWTH Aachen University Germany

Abstract
Abstract. The Randu Kuning Porphyry Cu-Au prospect area is situated at Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the south-east from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation and many dioritic intrusive rocks as part of the Late Eocene-Early Miocene magmatism. Porphyry Cu-Au and intermediate sulphidation epithermal Au mineralisation at Randu Kuning Prospect have strong genetic correlation with the magmatism-volcanism processes. The mineralized dioritic intrusive rocks at the Randu Kuning Prospect, are distributed at the centre of a half-circular depression are thought to be a feeder of an ancient volcanic crater. There are many intermediate sulphidation epithermal mineralization Au-base metals prospect area sourrounding the Randu Kuning porphyry Cu-Au. Most mineralizations both porphyry and epithermal environments are associated with the present of quartz- sulphides veins, but not all porphyry vein types contribute in copper and gold mineralization. The early quartz-magnetite veins (particularly A and M vein types) generally not contain Cu-Au or barren, while the later sulphide bearing veins such as quartz-sulphides (AB type) veins, chalcopyrite-pyrite (C type) veins, quartz-sulphides-carbonate (D type) veins, and lack of disseminated of sulphides. Mineralization contain copper and gold deposits in range at about 0.66-5.7 g/t Au and 0.04-1.24 % Cu. Whereas the epithermal level, mineralization mostly related with the present of pyrite+sphalerite+chalcopyrite+quartz+carbonate veins and hydrothermal breccias. The epithermal veins and breccia lead to the occurences of silver, zinc and lead mineralization, it commonly contain around 0.4-1.53 g/t Au, 0.8-8.5 g/t Ag, 0.17-0.39% Cu, 0.003-0.37% Zn, 00089-0.14% Pb. In porphyry environment, copper and are likely transported together as chloride complexes (CuCl0 and AuCl2-) in magnetite stability field. The chlorite complexes then react with existing magnetite to produce free gold and chalcopyrite. On the other hand, the epithermal environment, gold and copper usually are transported in a different ion complexes. Au is transported as the thio complexe [Au(HS)2-; Au2(HS)2-S2- and HAu(HS)2-] in phyrite stability field, while Cu is preferably transported as chloride complex in the hematite stability field.

Keywords
Mineralization style, Porphyry, Epithermal, Vein, Hydrothermal breccia

Topic
Geology

Link: https://ifory.id/abstract/3ZUgKQAhmWtr

Corresponding Author
Siti Umiyatun Choiriah

Institutions
1Department of Geology Engineering, Pertamina University, Jakarta
2Department of Geology Engineering, UPN Veteran Yogyakarta

Abstract
Nannofossil analyses of Miocene to Pleistocene, section of Nglebur river, Jiken, Blora of Central Java included of Rembang Zone, North East Java Basin. This research have been performed on 70 samples collected from this section. The result of this analysis consist of 18 genera were obtained with 57 species of nannoplankton. The research method used of field study (measure section) and quantitative analysis. The samples from taken include fine-grained rock (marl, shale) and carbonaceous. The river section that have been selected consist of a continuous sediment sequence from Miocene (Wonocolo, Ledok and Mundu Formation) to Pleistocene (Lidah Formation). The sample preparation has been carried out using smears slide method and nannotex determination. The biostratigraphy consist of 11 zones, there are consist of 2 Partial Zones and 9 Hose Zones. These Zona are Discoaster hamatus and Discoaster neorectus Partial zone / NN9, Hoze Zone of Discoaster hamatus- Discoaster neorectus with Discoaster quinqueramus/ NN10, Zone of Discoaster quinqueramus - Ceratolithus armatus/ NN11, Zone of Ceratolithus armatus - Ceratolithus rugosus/ NN12, Zone of Ceratolithus rugosus-Discoaster asymmetricus/ NN12, Zona of Discoaster asymmetricus - Oolithotus fragilis and Pseudoemiliania lacunosa/ NN14, Zona of Oolithotus fragilis - Pseudoemiliania lacunosa with Discoaster pansus-Reticulofenestra pseudoumbilicus/ NN15, Zona of Discoaster pansus-Reticulofenestra pseudoumbilicus with Discoaster surculus/ NN16, Zona of Discoaster surculus - Discoaster asymmetricus/ NN17, Zona of Discoaster asymmetricus- Discoaster brouweri/ NN18, Partial Zone Discoaster brouweri and Gephyrocapsa oceanica/ NN19.

Keywords
Biostratigraphy, Nannofossil, Rembang zone

Topic
Geology

Link: https://ifory.id/abstract/MgDhvX8CLHp9

Corresponding Author
Adelia Irna Santika

Institutions
a) Department of Geophysical Engineering, UPN “Veteran” Yogyakarta
*corresponding author: adeliairnasantika[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Surface Related Multiple Elimination (SRME) technique is known to have ineffectiveness to attenuate shallow water multiples, primarily because the water-bottom reflection required by SRME for predicting the multiples is not recorded due to lack of near offset data. The conventional technique using predictive deconvolution in either x-t or tau-p domain is often used to suppress these multiples, however, it also attenuates primary events that have a periodicity close to that of water layer. These limitations cause unrealistic seismic images in final output. In this paper, we propose an enhanced technique by modelling the water-bottom reflection and then adding it to the recorded seismic data. The modified data can then be used to predict first order multiple. We present multi stages processing workflow for removing water-bottom multiples in shallow water situations. Firstly, we use a multi-channel prediction filter estimated from the multiples for attenuating short-period water-layer related multiples. Secondly, we apply F-K filter for isolating signals from noise in frequency-wavenumber (f-k) domain. Lastly, SRME technique for suppressing other long-period surface multiples generated by sub-surfaces underneath the water-bottom. Through real-data examples from Nias Waters, North Sumatra, we demonstrate that our workflow provides an optimal multiple attenuation solution in shallow water environment in comparison with conventional methods such as predictive deconvolution or SRME alone. Tests result show that the multi stages technique can produce better result than using predictive deconvolution or SRME alone. Furthermore, we also show SRME approach can give optimum seismic migration images after we combined these stages. We successfully applied these techniques in 2D seismic data of Nias Waters.

Keywords
shallow water; multiple; predictive deconvolution; F-K filter; SRME

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/Fh3G6axNwEDu

Corresponding Author
MiaFerian Helmy

Institutions
1). Dosen Prodi Teknik Perminyakan
2). Mahasiswa Prodi Teknik Perminyakan

Abstract
AST-04 well is a production well located in Riau, this well currently has two production Layers (SD_04 has oil reserve and SD_05 has gas reserve). Using commingle completion the oil production in this well is below expectation. This problem caused by SD_05 gas production with high pressure which through SD_04 perforation hamper the oil flow. Re-completion design using multiple completion become a solution to improve oil production. Oil from SD_04 will be flowed using short string, while gas from SD_05 using long string. By Vogel Equation, the redesign results production increase to 290 BOPD with natural flow using tubing size 2 7/8 inch. To utilize SD_05 gas production and increase SD_04 oil production, natural gas lift selected to assist oil lifting. Gas produce from SD_05 will be injected to short string (SD_04 perforation area) through orifice. This method expected can increase oil production SD_04 layer to 406 BOPD with injection rate 1,367 MMSCFD. Using Craft, Holdden, & Graves equation, the orifice size 16/64 needed to flow the gas with injection rate desired.

Keywords
Multiple Completion, Natural Gas Lift, Production Optimization

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/zA7PB6aKFWcg

Corresponding Author
Muhammad Gazali Rachman

Institutions
Department of Geological Engineering, UPN "Veteran" Yogyakarta

Abstract
Physiographically, Pohijo Village, Sampung District, Ponorogo Regency is located in Solo Depression Zone East Java which is near with Lawu active volcano. Administratively, Pohijo village is near from Pacitan Regency where Grindulu Active Fault is located. Girindulu fault is NE-SW oriented which continuity is not yet known until now. This research was started with desk study by learning seismicity history of the area where the research is conducted. Then, a detail observation by doing field mapping was done. Based on the field data, it was found that there is evidence which are then identified as active fault named Pohijo fault. That evidence is divided into three areas which are North area (Kruwe village, Magetan regency), Central area (Pohijo village, Ponorogo regency), and South area (Bakalan village, Wonogiri regency). In Kruwe village, an evidence in the form of abrupt terrace and landslide were found. It is predicted that those are caused by the fault of strike slip which cuts lithology in the forms of unconsolidated materials and is N 010o E oriented. In the central area, Pohijo village, landslide, road shifting, and some broken society-s houses were found. The cut lithology are in the forms of unconsolidated materials and N 035o E oriented. In South area which is located in Bakalan village, Wonogiri regency, Central Java province, there are five damaged houses, landslide, and cracked ground. The lithology which is passed by the fault is bedded clastic carbonates. Based on the evidence of the active faults found in the field, it is concluded that Girindulu fault is continuous up to the North area passing by Wonogiri regency, Ponorogo regency, and Magetan regency. Thus, mitigation disaster plan of Girindulu fault should be re-observed so that the disaster risk effect can be minimalized

Keywords
Active fault, Ponorogo, Grindulu, Earthquake mitigation

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/6ZEUv8PuCq2e

Corresponding Author
Lloyd Thomas White

Institutions
1.GeoQuEST Research Centre, School of Earth, Atmospheric and Life Sciences, Northfields Avenue, University of Wollongong, Australia, 2522.

2. Southeast Asia Research Group, Royal Holloway University of London, Egham, Surrey, UK, TW20 0EX.

3. CGG Robertson, Tynycoed, Llanrhos, Llandudno, UK,

4. Institut Teknologi, Bandung, Jalan Ganesha 10 Bandung, Indonesia.

Abstract
Our understanding of the geological evolution of West Papua (or the Bird-s Head Peninsula and Bird-s Neck) predominantly stems from a systematic mapping campaign conducted by Indonesian and Australian geologists during the 1970-s and 80-s, together with the findings of mineral and hydrocarbon exploration by Dutch geologists in the early 1900-s. Most of the research that has been conducted since these initial, but comprehensive studies have been associated with continued exploration for hydrocarbons (e.g., around the Salawati and Bintuni Basins) and precious metals (e.g., associated with Grasberg–Ertsburg). Here we present an overview of research conducted over the past five years that was largely funded by several oil exploration companies. Our research did not focus on oil exploration, but instead attempted to update our understanding of the age of magmatic, metamorphic and deformation events, and to improve our knowledge of the regional stratigraphy of West Papua. These new data have been used to develop new tectonic models and paleogeographic maps that provide a framework for future studies in the region to build upon.

Keywords
Irian Jaya; Birds Head; Geology; Tectonics; Geochronology; Indonesia; New Guinea

Topic
Geology

Link: https://ifory.id/abstract/GhUTVZnFj3ce

Corresponding Author
Listiana Satiawati

Institutions
Program Studi Tenik Perminyakan, Fakultas Teknologi Kebumian dan Energi, Universitas Trisakti.
Jl. Kyai Tapa no. 1 Grogol Jakarta Barat 11440

Abstract
Proper and careful planning on the calculation of discharge in pipes in a system of three or more reservoirs are very important for the oil or the drinking water industry, as a collecting channel or as a fluid distribution. The discharge of fluid entering the pipe and coming out of the pipe can be calculated assuming the discharge flow is close to zero at the branching of the piping system. The debit calculation in this system can be done analytically and numerically, the numerical calculation will be faster than the analytical method. There are a number of analytical and numerical calculations that have been carried out by previous researchers, in this paper we do calculations by coding using other languages, namely Fortran. Calculations use data including elevation, length, diameter, roughness and friction factor from the pipe as well as Reynolds number data. Also uses the Moody Diagram, and the equations used are Bernoulli Equations, Continuity Equations, and Darcy-Weishbach Equations. In this paper numerical calculations using the Fortran program have been performed by displaying flow chart, coding, and the results of numerical calculations. The results obtained are quite in accordance with the results that have been calculated first, namely using the analytical method and linear interpolation by Streeter and numerical calculations that use Hardy Cross Method by Potter and Douglas. Deviation between our calculations with previous calculations, both analytically and numerically around 1%. So we conclude that our coding can be used for the calculation of debit in the three reservoir system planning. We present the numerical calculation results in the form of partial data while the complete data is presented in graphical form. This research can be continued to calculate a system of more than three reservoirs.

Keywords
Discharge, Reynolds Numbers, Moody Diagram, Bernoulli Equations, Continuity Equation, Darcy-Weishbach equation, Three Reservoir System

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/HcYQBqpbFtVR

Corresponding Author
Steven Chandra

Institutions
Petroleum Engineering Department
Institut Teknologi Bandung

Abstract
Despite the slow growth of EOR development in Indonesia, CO2 EOR has recently gained its momentum due to its versatility to diverse reservoir systems in Indonesia. Optimizing CO2 Injection in EOR activity is a must, since no incentive or tax holiday is given in Indonesia for this activity, contrary to the majority of policies around the globe. This study offers an innovative approach of CO2 flooding injection rate determination using closed loop optimization in project economic evaluation. Particle Swarm Optimization (PSO) algorithm was implemented as a method of optimizing the injection rate of CO2. These novel algorithms are known and proven to be able to work with massive number of datasets, as well as identifying and separating bad dataset(s). The result is optimum injection rate that brings maximum economical value to the project. Utilization of this method increases the NPV of the project by 10.4% and 12% increase in RF.

Keywords
CO2 EOR; Closed Loop; Particle Swarm Optimization

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/wNVn49rBfRhv

Corresponding Author
Melisa Tabi Padang

Institutions
Environmental Engineering UPN "Veteran" Yogyakarta

Abstract
Oil spill is one of the pollution which has a serious impact on the water and land area. Marine pollution has an impact on changing the marine environment. The purpose of this study is: (1) analyzing intensity potentials of oil spills, (2) Analyzing the direction of the spread of oil spills, (3) Formulate environmental sensitivity to oil spills based on ESI, (4) Determine strategies for handling oil spills. The initial stage of the research is literature study and survey of observation locations. The research observation point is based on consideration of tentative maps. The ESI parameters (Vulnerability Index, Ecological Index and Social Index) that have been obtained are then calculated to obtain the sensitivity level of the research area. The magnitude of the sensitivity value of the coastal environment is known based on the results of interpretation, digitization, direct observation in the field and calculations. Natural factors that are more dominant influence on coastal conditions obtained from the results of the analysis are then described. The value of coastal ESI is used as the basis for determining direction and management techniques for handling oil spills in Pari Island, Kepulauan Seribu Regency.The results showed that the level of environmental sensitivity was divided into 2 categories. These two categories are sensitive levels (ESI II zones) and quite sensitive (ESI III zones). The intensity of the potential for an oil spill is quite high, supported by the presence of 200 vessel owned by residents which almost every day operates. The direction of the spread of the oil spill tends towards the northeast and northwest. Appropriate handling techniques use technical approaches, socio-economic approaches and institutional approaches.

Keywords
environmental sensitivity index, oil spill, zone of mangrove, oil boom, oil absorbent, oil skimmer, APO.

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/ewb9aNxrV8JF

Corresponding Author
Feby Zulkarnain

Institutions
Study Program Magister Of Petroleum Engineering
Pembangunan Nasional University Of Veteran Yogyakarta

Abstract
PT. Pertamina Hulu Energi Ogan Komering (PHE OK) Water injection began in 1998, by injecting excess water in abandoned wells in Central ASD and continued in October 2000 and January 2002, and since May 2006 the injection rate was increased above 30,000 BWPD. From the analysis carried out, one of the obstacles in the injection water process at PHE OK is the main pipe capacity of the injection water which is getting smaller and the pressure drop along the pipe is very big. The pressure drop occurs due to the solid / deposition pile on the inside of the pipe, causing obstacles in the process of transferring injection water from the Block Station to the injection wells. From the laboratory analysis, the solid deposits inside the pipe wall is consist of more than 50% organic and hydrocarbon matters (paraffin, oils, and light asphaltene) often called as “Schmoo” deposit. Some pigging activities can not be done due to pipe size, pipe geometry that does not support, pipe construction that is not designed for pigging activities. To overcome the solid deposit problem, PHE OK carried out a field trial of Schmoo Remover Chemical to clean the pipe without using pipe pig. From the field trial result, the removal of the schmoo solid deposit resulted in a significant increase in water injection rates and decrease pipe pressure drop.

Keywords
Schmoo, cleaner, solid deposit, surfactant, water injection

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/RrLJ9CkVjdE2

Corresponding Author
Agus Sutiono

Institutions
Geological Engineering, University of Pembangunan Nasional “Veteran” Yogyakarta
Center for Volcanology and Geological Hazard Mitigation, Geological Agency of Indonesia

Abstract
The Opak Fault is famous as known as active fault in the South of Java which particularly is importance because accordingly historical noted, its fault has been experienced 3 times large earthquake events that claimed many victims and is being straddled Bantul regency of Yogyakarta. Usually producing uplifts only a few tens cm at a time, the cumulative effect has been to create in Gunung Kidul mountains range over the last million years. It coincides with producing Bantul basin faults fill including their confinements. The location is a site of intense deformation associated with convergence between plates Australia and Eurasia. However, Opak Fault strike-slip strain tend to be obscured due to draping by young active Volcanic Merapi sediments. In this place is hard to encountering outcrop of quasi-continuous fault segment at approximately 30 km of length that is capable to produce M. 6.3 as such earthquake occurring on May 27, 2006. Since this event, Based on conclusions from the experts, fault-s position and dipping role has being disputed; either fault dipping towards Southwest or Northwest, and fault zone along a ruptures are located toward the East in the vicinity of Gunung Kidul 5 or 10 km from Opak River. On the other hand, indicating from sediments typically accommodate within strike-slip fault system show strands where is suggested to traverse from Parangtritis Bantul Regency towards South Merapi Mountain slope. This Merapi sediments basin fill beneath Bantul regency, is considered to evaluate and drawing of important active fault lines in order to present seismic risk of all faults map in this area. Further, the convenient method was resorted to taking comprehensive features for understanding principle of slope surface motions. It may also is located in the vicinity of Bantul basin fill towards Merapi. This study has identified en echelon areas of curving slope shape by using slope propagation shifting analysis from satellite imagery. The aim of this paper is intended to present result of research in which delineates corridor of Opak Fault zone, where could be bounded by confinements within both of sidewall faults and cross-basin faults system identified. After in the last first stage study of the a comparative Opak Fault review presented before, this is second stage result from total four stages of the entire over all studies, which is important in order to get area for much more focus in highlighting any fractures in between its boundaries of Opak Fault system, where underlying and traverse the thick young Merapi sediments beneath Bantul region in Southwest, striking toward Merapi volcano in Northeast. The research will be continuing into other next 2 stages presented later of morphotectonic properties identification and field mapping to get much more comprehensive overview in the ultimate result of research. The indication keys of strike slip fault properties were identified during this second stage by the following: (1) South

Keywords
Opak fault delineations, fault damage zones, Bantul basin fill, Side wall faults and Merapi slope shifted.

Topic
Geology

Link: https://ifory.id/abstract/aKfDuZwXTmjE

Corresponding Author
Joko Soesilo

Institutions
Faculty of Mineral Technology, UPN Veteran Yogyakarta

Abstract
The sub aerial geological cross section of Jurassic magmatic rocks starts from the eastern slope of the Meratus Mountains near Batu Licin Town, through Laut island to the east towards Sebuku Island showing fragmented ophiolite set. Deformed basalt, diabase dyke and plagiogranite with, in some localities chert and red claystone tightened in the sepentinized basalt, some of which still show remnant of the pillows lava such as cropped out north of Batu Licin Town and in the western shoreline of Laut Island are indicative to upper part of Ophiolite. While in the eastern Sebuku Island may be found cromite layer in dunite, layer cromite and bulk.

Keywords
Jurassic magmatic rock, Eastern Meratus, ophiolite

Topic
Geology

Link: https://ifory.id/abstract/QuEDXGqvTJAw