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塔里木板块轮南井区三叠系为典型的克拉通内凹陷盆地型陆相碎屑岩,主要由湖泊和三角洲沉积体系构成产油层系。层序单元的划分对比是岩性油气藏圈定的核心技术,以测井和三维地震资料为依据建立井震合一的层序地层格架,所划分的3个层序8个体系域控制了三套区域性和多套局部性储盖组合。区域性储盖组合以层序为单元,层序下部的低位体系域和湖侵体系域砂岩组成区域性储层,上部高位体系域的湖相和三角洲相泥岩为区域性盖层,以构造圈闭为主;局部性储盖组合以体系域为单元,由同一体系域的砂岩和邻近泥岩组成,以岩性圈闭为主。结合地震储层预测技术可划定新的岩性地层圈闭,高位体系域期和湖侵体系域中发育的局部性储盖组合是岩性地层圈闭勘探的重点。
The Triassic of Lunanjing area in Tarim plate is a typical cratonic inlaid basin-type terrestrial clastic rock, which is mainly composed of lacustrine and delta sedimentary system. Sequence stratigraphic division is the core of delineation of lithologic reservoirs. Based on well logging and 3D seismic data, a wellbore-seismic sequence stratigraphic framework is established. The three sequences and 8 system domains are controlled Three sets of regional and multiple sets of local storage and cover combination. The regional reservoir-caprock assemblage is composed of sequence stratigraphic units. The lower system tract in the lower part of the sequence and the sandstone in the lacustrine system tract consist of regional reservoirs. The lacustrine and delta mudstone in the upper highstand system tract are regional cap rocks. The main reservoirs and reservoirs are mainly composed of sandstones and adjacent mudstones of the same system tract, which are mainly composed of lithologic traps. The combination of seismic reservoir prediction technology can delineate new lithologic stratigraphic traps. The local reservoir-cap combination developed in the highstand system tract and the lacustrine system is the focus of trapping exploration in lithologic stratum.