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通过对周口拗陷石炭—二叠系分布、烃源岩特征、生烃史、生储盖组合类型、储集特征、油气输导体系及充注史、圈闭类型及其形成演化以及典型油气藏剖析等综合研究,评价了该区石炭—二叠系油气资源及其成藏条件。结果表明:煤是石炭—二叠系最主要的烃源岩,分布广,厚度大,类型好,生烃潜力高;印支期和喜山期是石炭—二叠系最主要的生烃期;石炭—二叠系油气存在自生自储、下生上储和古潜山3种生储盖组合类型,其中,下生上储型是最重要的生储盖组合类型;石炭—二叠系油气发育有砂岩输导层、不整合面输导层及断裂系统3种输导体系;石炭—二叠系油气主要有印支和喜山两期油气运聚及充注事件;区内发育多种复合构造圈闭、下古生界风化壳岩溶地貌圈闭及上古生界地层—岩性圈闭;喜山期晚期是区内石炭—二叠系最主要油气生成和运聚期,并且圈闭定型期与油气运聚期配置良好;南12井油藏是区内石炭—二叠系油气资源的重大发现。总之,该区石炭—二叠系油气资源潜力较大,成藏条件有利,有望获得油气勘探的突破。
Based on the distribution of Carboniferous Permian in Zhoukou Depression, hydrocarbon source rocks, hydrocarbon generation history, reservoir-cap assemblage types, reservoir characteristics, hydrocarbon transport systems and filling history, trap types, formation and evolution, Reservoir analysis and other comprehensive studies, evaluation of the area Carboniferous - Permian hydrocarbon resources and hydrocarbon accumulation conditions. The results show that coal is the most important hydrocarbon source rock of Carboniferous Permian, with wide distribution, large thickness, good type and high potential for hydrocarbon generation. Indosinian and Himalayan are the most important hydrocarbon generation periods of Carboniferous Permian The Permo-Carboniferous-Permian hydrocarbons have three kinds of genesis-reservoir-cap assemblages, ie, genesis-self-storage, subsurface-supragenesis and buried hill. There are three types of oil and gas transport systems, sandstone, unconformity and fracture system. Carboniferous-Permian hydrocarbons mainly include the migration and accumulation of oil and gas during the Indosinian and Xishan Periods; Sedimentary complex traps, Lower Paleozoic weathering crust karst landforms and Upper Paleozoic stratigraphic-lithologic traps; the late Himalayan period is the most important hydrocarbon generation and migration period of Carboniferous-Permian in the area, The closed-set period and the hydrocarbon migration and accumulation period are well-arranged. Well No.12 in the well is a major discovery of the Carboniferous-Permian hydrocarbon resources in the area. In conclusion, the potential of Carboniferous-Permian oil and gas resources in this area is relatively large with favorable reservoir forming conditions and is expected to achieve a breakthrough in oil and gas exploration.