PETROLEUM GEOLOGY CONDITION ANALYSIS ON THE MESOZOIC OF THE CUOQIN BASIN IN TIBET

According to the petroleum geologic research of outcrop,the test analysis of the rock samples,and the datum or results of the predecessors,this paper had researched the petroleum geological conditions of Cuoqin Basin integratively,such as the hydrocarbon rock,reservoir rock and cap rock.The result suggest that the Cuoqin Basin in Mesozoic have three units source rocks(limestone and marlstone of Langshan Formation-Jiega Formation,mudstone of Chuanba section of Duoni Formation,marlstone of Jienu Group),three kinds of reservoir rocks(reef-limestone,dolostone and sandrock of Langshan Formation and Duoni Formation),two units cap rocks(mudstone of Duoni Formation and limestone of Langshan Formation).Furthermore,the discovery of oil exposure and the bituminous of fluid inclusions showed that the Cuoqin Basin had underwent the process of oil and gas generated,migrated,gathered and lost,possesses the material foundation of oil and gas generation and the petroleum geologic conditions of hydrocarbon accumulation.All the evidences indicate that the Cuoqin Basin has good prospect of oil and gas exploration.