鄂尔多斯盆地上三叠统延长组深层油气聚集规律  

Oil accumulation rules in deep zones of Upper Triassic Yanchang Formation in Ordos Basin

作　　者：屈红军[1] 杨县超[2] 曹金舟[2] 范玉海[1] 关利群[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069 [2]延长油田股份有限公司,陕西延安716000

出　　处：《石油学报》2011年第2期243-248,共6页Acta Petrolei Sinica

基　　金：国家科技重大专项(2008ZX05025-006);国家重点基础研究发展规划(973)项目(2009CB219400)联合资助

摘　　要：最近几年鄂尔多斯盆地西部及中南部延长组深层的油气勘探取得了重大突破,探明石油地质储量数亿吨,研究鄂尔多斯盆地延长组深层油气聚集规律具有重要现实意义。通过鄂尔多斯盆地延长组深层源、储、运聚与油藏关系的系统分析,揭示了延长组深层油气聚集规律。研究结果表明,鄂尔多斯盆地延长组深层油藏主体为"上生下储"型岩性油气藏,油气聚集具有"源控区、相控带、压力差控位"的规律,具体为:延长组深层油区分布于近烃源岩区,已知油藏基本分布于三角洲前缘水下分流河道叠合连片区带,大多数长8油藏分布在长7油层组与长8油层组异常压力差低值背景下的相对高值区。A great breakthrough has been made in oil exploration activities in deep zones of the Yanchang Formation in the western and southern-centeral Ordos Basin in recent years,where several hundred millions geological oil reserves have been confirmed.Therefore,it is of great practical value to study oil accumulations in deep zones of the Yanchang Formation in the Ordos Basin.The present paper revealed oil accumulation rules in deep zones of the Yanchang Formation by systematically investigating interrelationships between source and reservoir rocks,oil migration and accumulation,etc.The study showed that accumulations in deep zones of the Yanchang Formation were dominated by lithologic reservoirs with source rocks above,the oil accumulation was characterized by ＂provinces controlled by source rocks,plays controlled by sedimentary facies,and positions controlled by pressure difference of reservoirs＂,specifically,deep provinces of the Yanchang Formation occurred in areas adjacent to source rocks,plays mainly occurred in superimposed linked areas of delta front subfluvial distributary channels,and most of reservoirs in the Member Chang 8 occurred in areas with relatively high abnormal pressure under the background of low abnormal pressure difference between the Member Chang 7 and Member Chang 8.

关 键 词：鄂尔多斯盆地 延长组 深层 源控区 相控带 压力差控位 

分 类 号：TE122[石油与天然气工程—油气勘探]