摘要
After the paleo-pressure build-up by means of measured pressure,mudstone sonic log interval and fluid inclusions,the pressure evolution model of the fourth member of the Shahejie Formation is analyzed in Minfeng area,Dongying Depression.The results show that,different periods of reservoir formation correspond to different pressure system in Es4 reservoir,Minfeng area.The hydrocarbon accumulation of Sha2-last stage of Dongying was accomplished in a higher pressure system.The hydrocarbon accumulation environment of the last stage of Ng was normal pressure.And after the middle and late period of Nm the cracking gas in the central area of sub sag was formed in a high pressure system.