延长油田郭旗西区长6储集条件及油气成藏控制因素分析
Oil and gas pool formation control factors and reservoir conditions of Chang-6 reservoir in west area of Guoqi, Yanchang oil field
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摘要: 通过对延长油田郭旗西区长6油层组储层的沉积微相、储层的岩石学特征、成岩作用、孔隙结构特征和物性条件研究,探讨了影响储集条件和油气成藏的主要因素。延长油田郭旗西区三叠系延长组长6早期沉积微相以三角洲前缘水下分流河道为主,长6晚期以三角洲平原分流河道沉积为主,储集层发育。受成岩后生作用影响,形成了低孔隙度、特低—超低渗透率的储集层。油藏分布主要受沉积微相和储层物性控制,为典型的岩性油藏。Abstract: The authors question the main factors of influence reservoir conditions and oil-gas pool formation, by studying sedimentary microfacies,petrodistinction, diagensis, porous structural character and physical quality conditions.The main sedimentary microfacies of Triassic system Yanchang Formation incipient Chang-6 reservoir horizons in west area of Guoqi,Yanchang oil field is delta front subaqueous distributary channel deposits, and later Chang-6 mainly is distributary channel. Reservoir horizons are development,this area form reservoir horizons of low porosity and extra low permeability for diagensis influence,oil pool is the typical litho-petrolifertous-pool,distribution of oil pool is controlled by sediment ary micro facies and reservoir physical quality.
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