辽东湾JZS油气田西侧边界断层输导性能分析

JZS油气田位于辽东湾辽西低凸起中北段，其西侧边界辽西1号、辽西2号断层输导性能的优劣直接决定辽西凹陷的油气能否运移到辽西低凸起，这对认识该区油气成藏及勘探决策具有重要意义。根据JZS构造的单井和三维地震资料，在断层活动性分析的基础上，采用泥岩涂抹因子和断面正压力分析方法，对辽西1号、辽西2号断层在JZS油气田成藏期的侧向和垂向封闭性进行半定量分析。结果表明，JZS油气田成藏期即东一段沉积末期, 辽西1号、辽西2号断层在沙河街组三段侧向开启，在1 800 m以上垂向开启，断层具备良好的输导性能，能够将辽西凹陷的油气垂向运移到辽西低凸起。 

The Carrying Capability of Western Margin Faults of JZS Oilfield and Their Controls on Hydrocarbon Accumulation in Liaodong Bay

JZS oilfield,which is located in the middle-northern part of Liaoxi lower uplift,is bounded by Liaoxi No.1 and Liaoxi No.2 faults in the west.Whether hydrocarbons generated in Liaoxi depression could migrate to Liaoxi lower uplift was directly determined by the carrying capabilities of the two margin faults.So,research on the carrying capabilities of the margin faults is of magnitude significance for understanding hydrocarbon accumulations and making wise decisions for exploration in the region.In this paper,based on the well and 3D seismic data of JZS structure,the history of faulting movement,transversal and vertical sealing abilities during the period of JZS hydrocarbon accumulation of the two margin faults were studied by employing technologies such as tectonic evolution sections,mudstone smearing factors and pressure analysis on fault plane.Research results showed that,during the period of JZS hydrocarbon accumulation which was the final stage of the 1st member of Dongying Formation,Liaoxi No.1 and Liaoxi No.2 faults were active,opened traversely in the 3rd member of Shahejie Formation and vertically above 1,800 m,so they served as a migration conduit system for hydrocarbons generated in Liaoxi depression and migrating to Liaoxi lower uplift.