【摘要】 酒西坳陷下白垩统赤金堡组和下沟组属湖相碳酸盐岩沉积,主要发育一套纹层状泥质白云岩和白云质泥岩,泥质白云岩中有机纹层(藻纹层)结构发育,但非均质性很强。烃源岩中有机质纹层分布与其生烃潜量正相关,显示出其间的成生联系。油源对比研究表明:在母源先质、生源环境、水体介质和热成熟作用等方面,均反映出酒西坳陷下白垩统下沟组藻纹层泥质白云岩与该区已发现的“主体原油”之间的亲缘关系,藻纹层泥质白云岩是其主要烃源岩。富含有机质纹层的烃源岩不仅是优质烃源岩,由于其生烃物质的层状富集,在生、排烃过程中,更有利于微裂缝的形成和排烃。图7表2参11更多还原

【Abstract】 Lower Cretaceous Chijinpu and Xiagou Formations in the Jiuxi Depression mainly consist of laminated argillaceous dolomites and dolomitic mudstones deposited in lacustrine environments.The argillaceous dolomite contains highly heterogeneous organic laminas(algal-lamina).The distribution of organic laminas in source rocks is positively related with hydrocarbon genetic potential,which shows a genetic relationship between them.During oil-source correlation,the biological markers showed that the oil in this area is predominantly originated from the algal-laminated argillaceous dolomites of the Lower Cretaceous Xiagou Formation with evidences from parental materials,sedimental environments and thermal maturation,etc.The rocks rich in organic laminas can not only work as good source rocks,but also enhance the formation of micro-fractures between gaps and help the hydrocarbon expulsion during the hydrocarbon generation and expulsion processes thanks to the laminated distribution of organic materials.更多还原