PETROLEUM ACCUMULATION SYSTEMS OF C SAE IN WEIXINAN DEPRESSION OF BEIBUWAN BASIN
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摘要: 以油气成藏体系理论为指导,综合地质、地球物理、地球化学等资料,系统分析了涠西南凹陷C洼油气成藏体系的基本地质条件与特征,并建立了C洼油气成藏体系的成藏模式。结果表明,C洼油气成藏体系以流沙港组流二段中深湖相泥岩为主力烃源岩;输导体系由断层、不整合面与渗透层联合构成,并以断层的垂向输导和不整合面的侧向输导为主;发育多种类型的构造圈闭,其形成及演化与油气生、排、运、聚有良好的匹配关系;该成藏体系的有利勘探目标为紧邻C洼生烃灶、有断层垂向沟通烃源岩与储集层的圈闭,以及涠西南低凸起上发育的圈闭,不整合与相互连通的渗透性砂岩层构成有效输导体系。Abstract: Under the guidance of petroleum accumulation system (PAS) theory and combined with the data of geology, geophysics and geochemistry, the basic geological conditions and characteristics of the PAS in C sag within the Weixinan depression have been analyzed systematically, and its model for hydrocarbon accumulation has also been set up in this paper. The results show that the mid-deep lacustrine mudstone of the second member of the Liushagang formation is the primary source rock in the PAS. Faults, unconformitis and permeable sandstone layers constitute the hydrocarbon conduit system, in which vertical connectivities of faults and lateral permeabilities of unconformities are more important. Many kinds of structural traps, which match well with generation,expulsion,migration and accumulation of hydrocarbon are developed in this PAS. The favorable exploration objects in this PAS include traps (near C sag) accompanying with faults that connect source rocks with reservoirs and traps located in the Weixinan lower uplift with unconformities and connective permeable sandstone layers as effective conduit systems.
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