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In order to improve and increase oil recovery by EOR CO2 injection, CO2 MMP is an important key parameter whereas the CO2 injection must be conducted at or above MMP. The aim of this study is to determined CO2 MMP by using one-dimensional CMG simulation model and proposed the CO2MMP correlations. on L reservoir. To be able to make an accurate simulation model and to choose the best correlation , it is necessary to validation by comparing the obtained CO2 MMP with experiments in the laboratory on 8 type oil from various field. The result showed that Zhang-s correlation is the best correlation which have -6.9% average percentage of errors while using the CMG simulation model shows the average percentage errors approximately -6.5 %. Using Zhang-s correlation we calculated that CO2 MMP on L reservoir about 3388 psia and from CMG simulation we have obtained CO2 MMP equal as 3428 psia.