塔里木盆地塔西南与库车山前带油气成藏差异性研究及勘探建议

近年来塔里木盆地库车山前带勘探获得巨大成功，推动塔西南山前带勘探掀起新的高潮。实际上，这2个山前带的油气来源、输导模式及控藏关键因素等具有一定差异，塔西南山前带深化勘探要充分重视本身的成藏特点。库车山前带以侏罗系煤系烃源岩供烃为主，三叠系为辅，早期大断裂直接沟通源储，以“斜T”型模式输导为主，高陡逆冲构造紧密叠合,整体控制油气分布，局部构造控制成藏。而塔西南山前带以石炭系-二叠系海相烃源岩供烃为主，侏罗系煤系烃源岩为辅，早期隐伏弯褶大断裂为输导通道，以“仰F”型模式输导为主，双向对冲弯褶构造独立控藏。总体上，塔西南山前带石炭系-二叠系烃源岩、早期隐伏大断裂及完整的弯褶构造圈闭发育区是有利的勘探方向。

Differences of Hydrocarbon Reservoir Forming between Southwestern Tarim Basin and Kuche Mountain Front

The exploration of Kuche mountain front has made a great success in the past few years,which greatly promoted the exploration of southwestern Tarim basin mountain front.In fact,differences exist in the hydrocarbon resource,transforming patterns and key reservoir-controlling factors of the two mountain fronts.Therefore full attention should be paid to the reservoir forming characteristics of southwestern Tarim mountain front.The source rock in Kuche mountain front is mainly coal bed of Jurassic,followed that of Triassic.The early big fault penetrates source rock and reservoir directly,the main transforming pattern is “direct connect slanting T”.The closely folding and high steep imbricate arrangements control the distribution of hydrocarbon,and local structures control reservoir forming.But the source rock in southwestern Tarim basin is mainly Carboniferous-Permian marine faces source rock,followed Jurassic coal beds.The relationship between the early forming buried slide big fault and reservoir is very complicated,and “replace upward F” is the main transforming pattern.Two direction compress high steep imbricate arrangements control the reservoir solely.Totally speaking,the area with Carboniferous-Permian marine faces source rocks,early forming buried slide big faults and integrate slide anticline traps is the favorable exploration direction.