鄂尔多斯盆地姬塬大油田多层系复合成藏机理及勘探意义  

Multi-layer composite accumulation mechanism and exploration significance of Jiyuan Oilfield, Ordos Basin

作　　者：付金华[1,2] 李士祥[1,2] 刘显阳[1,2] 杨时雨[1,2] 罗安湘[1,2] 惠潇[1,2] 

机构地区：[1]中国石油长庆油田公司,陕西省西安市710018 [2]低渗透油气田勘探开发国家工程实验室,陕西省西安市710018

出　　处：《中国石油勘探》2013年第5期1-9,共9页China Petroleum Exploration

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05044;2011ZX05001-004)

摘　　要：姬塬地区侏罗系直罗组、延安组、富县组和三叠系延长组均已发现了油藏,发现了储量规模超10×108t级的姬塬大油田。姬塬地区发生了多期湖平面的上升和下降的过程,湖平面的变化形成了三角洲平原分流河道、三角洲前缘水下分流河道、三角洲前缘河口坝和滨浅湖砂质滩坝等多种类型的砂体。姬塬地区烃源岩厚度大,具有强大的生排烃能力,生烃增压产生的过剩压力为石油运移的主要动力,生成的油气在异常高压的驱动下沿着裂缝型、裂缝—砂体型、裂缝—不整合面型、裂缝—砂体—不整合面型和砂体型等多种输导体系运移成藏,形成了多层系复合成藏的含油局面。储层致密与油气成藏基本同步进行,具有边成藏边致密的特征。研究认为姬塬地区具有"生烃增压、双向主动排烃、近源运聚、多种输导、差异聚集"的成藏特征,姬塬大油田的发现得益于地质理论的创新、勘探技术的进步和不断的勘探实践。Oil reservoirs have been found in Triassic Yanchang Formation and Jurassic Zhiluo Formation, Yan＇an Formation, Fuxian Formation, and one-billion-tonnage Jiyuan Oilfield has been discovered. Multi-stage lake rise and fall occurred. Distributary channels in deltaic plain, subaqueous distributary channels, mouth bars in delta front and sandy dam of shore lakes, and other types of sand body were well developed during the process. Source rocks are thick with strong hydrocarbon generation and expulsion ability, which generates hydrocarbon pressurization and becomes the main driving force of oil migration along the fracture, fracture-sand, fracture-unconformity, fracture-sand -unconformity, and other conduit system. This kind of migration and accumulation forms multi-layer composite accumulation mechanism. Reservoir tightening and hydrocarbon accumulation is synchronous. Jiyuan Oilfield features in hydrocarbon generation pressurization, bilateral expulsion, near-source accumulation, multiple conduit, and differential accumulation. Geological theory innovation, exploration technological advances and constant exploration practice favor the discovery of Jiyuan Oilfield.

关 键 词：鄂尔多斯盆地 姬塬大油田 成藏机理 多层系 勘探意义 

分 类 号：TE122[石油与天然气工程—油气勘探]