西藏措勤盆地中生界石油地质条件分析

根据野外石油地质调查、室内分析研究和前人的资料及研究成果,对西藏措勤盆地的烃源岩、储集岩、盖层等石油地质条件进行了分析,认为措勤盆地中生界发育烃源岩主要有3套:郎山组—捷嘎组灰岩和泥灰岩、多尼组川巴段泥岩和接奴群泥晶灰岩;储集岩主要为郎山组和多尼组灰岩(礁灰岩)、白云岩和砂岩;盖层有多尼组泥质岩和郎山组泥灰岩。野外调查中发现了大量地表油气显示,并在包裹体中发现了沥青质,表明盆地经历了油气生成、运移、聚集和散失的过程,具有油气生成的物质基础和油气成藏的石油地质条件,显示出措勤盆地良好的油气远景。

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.