渤海海域潜山油气运移模式与运聚能力定量评价

Oil and gas migration models and quantitative evaluation on migration and accumulation capacity of buried hills in Bohai sea area

潜山是渤海海域近期增储上产的重点领域,油气运移条件是控制潜山成藏的关键因素。本文以大量已探明潜山油气藏解剖为基础,对渤海海域潜山进行了系统分类,总结了不同类型潜山油气藏运移模式及主控因素,探讨了运聚能力定量评价方法。研究表明:①根据潜山与生烃灶关系,渤海海域潜山可划分为源内、源边和源外型。②源内型潜山发育“源内—断压双控覆盖式”近源运聚模式,潜山储集物性及圈闭规模是控制运聚量的关键;源边型潜山发育“源边—断压双控侧供式”近源运聚模式,源外型潜山发育“源外—断裂—潜山顶面不整合”及“源外—潜山内幕不整合”两类运聚模式,源边和源外型潜山油气运聚能力受圈闭大小、储集物性、运移距离、供烃量、不整合输导性能、供烃动力等多种因素控制。③在三类潜山油气藏运聚主控因素分析基础上,基于专家打分和加权平均原理,分别建立了“源内型”“源边型”和“源外型”潜山油气运聚能力定量评价模型,指出锦州14-A、渤中8-A等源内型潜山、龙口7-A源边型潜山是未来持续突破的重点方向,旅大25-A等源外型潜山具有一定勘探潜力。

Buried hill is a key field for increasing reserves and production in Bohai sea area in the near future,and hydrocarbon migration conditions are key factors controlling the hydrocarbon accumulation in buried hills.Based on the anatomy of a large number of proved buried hill reservoirs,this paper systematically classified the buried hills in Bohai sea area,summarized the migration models and main controlling factors of different types of buried hill reservoirs,and discussed the quantitative evaluation method of migration and accumulation capacities.The results show that①According to the relationship between buried hills and hydrocarbon kitchen,the buried hills in Bohai sea area can be clarified into three types,i.e.intra—source,source—edge and extra-source types.②The near—source migration and accumulation pattern of“intra—source and fault—pressure double-controlled overlaying”is developed in intra-source buried-hills,and the physical properties of buried hill reservoir and trap scale are the key to control migration and accumulation.The near-source migration and accumulation pattern of“source-edge and fault-pressure double-controlled lateral supply”is developed in source-edge buried hills,while two migration and accumulation patterns of“extra-source-fault-top unconformity of buried hills”and“extra-source-inside unconformity of buried hills”are developed in extra-source buried hills.The hydrocarbon migration and accumulation capacities in source-edge and extra-source buried hills are controlled by many factors,such as trap size,reservoir physical properties,migration distance,hydrocarbon supply amount,transport properties of unconformities,hydrocarbon supply power and etc.③Based upon the analysis of main factors controlling the migration and accumulation of these three types of buried hill reservoirs,experts scoring and weighted average principles,the quantitative prediction models of hydrocarbon migration and accumulation abilities of“intra-source”“source-edge”and“extra-source”buried hills are established respectively,pointing out that the“intra-source”buried hills of JZ14-A and BZ 8-A,“source-edge”buried hill of LK7-A are favorable traps for future exploration,and“extra-source”buried hill of LD25-A has certain exploration potential.