辽河坳陷大洼构造带油气来源与充注模式研究  

Hydrocarbon Source and Charging Pattern in the Dawa Structural Zone of Liaohe Depression

作　　者：曹宇森 Cao Yusen(PetroChina Liaohe Oilfield Company, Paryin, Liaoning 124010, China)

机构地区：[1]中国石油辽河油田分公司

出　　处：《特种油气藏》2019年第3期43-48,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006-005)

摘　　要：针对大洼构造带油气来源认识不清、油气输导体系和充注模式研究不清的问题,运用地球化学分析手段,结合区域地质条件分析,明确了大洼构造带油气来源和输导体系,建立了大洼构造带油气充注模式。研究结果表明:大洼构造带油气来源于清水洼陷沙一段和沙三段烃源岩;油气主要输导途径为断层,以垂向运移为主、侧向运移为辅。大洼构造带西部具有断层-裂缝、断层-不整合面和断层-砂体三重输导体系,东部具有断层-裂缝、断层-不整合面双重输导体系;大洼构造带西部具有双源三重输导体系近源充注模式,东部具有单源双重输导体系远源充注模式;不同的充注模式控制了大洼构造带油气分布特征,具有近油源断层处油气富集成藏的规律,大洼构造带东部中生界和太古界近油源断层处仍具有较大的勘探潜力。该研究对确定下步勘探方向具有一定的借鉴意义。In view of the unclear hydrocarbon source, hydrocarbon migration system and charging pattern in Dawa structural zone, geochemical analysis was used to identify the hydrocarbon source and migration system and estab lish the corresponding charging pattern by combining with regional geology. Result indicates that the hydrocarbon in Dawa structural zone migrated from the Shahejie-1 and Shahejie-3 members in Qingshui Depression. Fault is con sidered as the major migration system which is dominated by longitudinal migration and assisted by lateral migration. The migration system in the west of Dawa structural zone is characterized by a triple migration system with fault - fracture, fault-unconformity and fault-sandbody. The migration system in the east of Dawa structural is considered as a dual migration system with fault-fracture and fault - unconformity. It is concluded as a near-source charging pattern with dual-source and triple migration system in the west and a distal-source charging pattern with single- source and dual migration system. The hydrocarbon distribution is greatly dependent on the hydrocarbon charging patterns and is characterized by a favorable near-source accumulation around the fault. The Mesozoic and Archean near-source faults in the eastern Dawa structural zone still show relatively great exploration potential. The analysis of hydrocarbon source and charging pattern could provide certain guidance for the further hydrocarbon exploration in this area.

关 键 词：油源对比 输导体系 充注模式 大洼构造带 辽河坳陷 

分 类 号：TEI22[石油与天然气工程]