库车坳陷南缘油气成藏主控因素及勘探前景  

Key controlling factors for hydrocarbon accumulation on the southern margin of the Kuqa depression and prospects for hydrocarbon exploration

作　　者：张忠民[1] 李铁军[1] 赵洪文[1] 孙冬胜[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《中国地质》2006年第6期1321-1327,共7页Geology in China

基　　金：中石化科技项目(P00002);国家"973"重点基础研究项目(G1999043300)资助

摘　　要：库车坳陷南缘油气资源丰富,发育多套生储盖组合,勘探潜力巨大。圈闭形成、生烃史、有机包裹体研究表明,库车坳陷南缘油气充注为两期,第一期成熟油、气充注为库车末期(5～2 Ma),第二期高熟油充注为第四纪—现今(2～0Ma)。控制油气成藏的最主要因素为油源断层的沟通作用、优质的储盖组合、圈闭的有效性及其与油气成藏期的匹配关系,其次为古隆起的构造演化背景、多期成藏—晚期为主的成藏特征及良好的保存条件等因素,油气成藏模式主要为早期油气藏—晚期聚凝析气藏型。近期的油气勘探应以中新生界构造圈闭为主,构造变形程度相对强烈的东秋里塔格构造、亚肯平缓斜坡构造带的背斜、断背斜以及阳霞凹陷的阳北构造带等是油气勘探的有利区带。The southern margin of the Kuqa depression with abundant petroleum resources and multiple reservoir-seal assemblages has great potential for petroleum exploration. Studies of trap formation, hydrocarbon generation history and organic inclusions show that there are two hydrocarbon-generating stages on the southern margin of the Kuqa depression. The first discharge of mature petroleum occurred at the end of the deposition of the Kuqa Formation （at 5 to 2 Ma BP）, and the second discharge of high-maturity oil occurred from the Quaternary to present （at 2 to 0 Ma）. The key factors for controlling petroleum accumulation are connection of sources by faults, good reservoir-seal assemblages, effective traps and their matching relation with hydrocarbon accumulation periods. Other factors are the tectonic evolution setting of a paleo-uplift, characteristics of formation of petroleum accumulations in multiple stages conditions. The petroleum accumulation-forming model is stage and condensate gas accumulations in the late should focus on Meso-Cenozoic structural traps （mainly in the late stage） and favorable preservation the formation of petroleum accumulations in the early stage. The authors propose that recent petroleum exploration such as the eastern Qiulitag structure with relatively intense structural deformation, anticline and fault-anticline of the Yaken gentle slope structural zone and Yangbei structural zone of the Yangxia subbasin.

关 键 词：油气成藏模式 主控因素 勘探前景 库车坳陷南缘 

分 类 号：P618.130.2[天文地球—矿床学]