Analysis of Litho-stratigraphic Reservoirs Distribution in High-resolution Sequence Stratigraphic at the Lower Jurassic Sangonghe Formation in Baijiahai Area
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摘要: 下侏罗统三工河组为白家海地区油气勘探重要层系之一，层序地层格架存在争议，层内岩性油气藏的分布研究较少，阻碍侏罗系油气进一步勘探开发。在高分辨层序地层学理论指导下，通过对露头、岩心、地震及钻测井等资料分析，明确岩性油气藏在研究区时空分布特征。结果表明，三工河组划分为1个长期旋回，3个中期旋回及9个短期旋回；所建立的高分辨层序地层格架在区内等时对比应用较好。岩性油气藏发育受控于中期基准面旋回的演化，不同中期基准面旋回内储集砂体发育范围和叠置方式存在明显差异，造成岩性油气藏类型时空分布发生变化。其中，MSC1和MSC3有利于岩性油气藏的分布，推测靠近阜康凹陷附近，MSC2有利于形成大面积油气藏。Abstract: The Sangonghe formation of low Jurassic in Baijiahai area is one of the main hydrocarbon-bearing strata, where sequence stratigraphic framework has not reach agreement, and litho-stratigraphic reservoirs analysis has thin research base, all of which are the key reasons for hindering deeper exploration and development. The result shows according to the theory of the high-resolution sequence stratigraphic, combined with outcrops, cores, seismic, drilling and logging data analysis, Sangonghe formation has been divided into one long-term base level cycle,three mid-term base level cycles and nine short-term base level cycles, and sequence framework has a favorable application effect in study area. Litho-stratigraphic reservoirs are controlled by mid-term base level cycle, and reserve sands have different development region and superimposed type in different mid-term base level cycle, which causes litho-stratigraphic reservoirs has unequal distribution. MSC1 and MSC3 are helpful for development of litho-stratigraphic reservoirs, and MSC3 are helpful for development of oil reservoir near Fukang sag.
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