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南八仙构造整体为一被断层复杂化的背斜构造,在该构造带内形成的南八仙油气田其油气聚集、运移、成藏都受断层控制。通过断层封闭性机理及影响因素分析,利用南八仙构造解释成果以及钻井砂、泥岩厚度资料,采用断移地层的砂地比、泥岩涂抹系数和断层的活动性等三种方法对南八仙构造中的仙北断裂和与其同期形成的(8)、(14)、(21)、(25)、(26)、(27)、(28)、(41)号断层的封闭性进行了评价。
The structure of Nanbaxian is an anticlinal structure complicated by faults, and the accumulation, migration and accumulation of hydrocarbons in the Nanbaxian oil and gas field formed in the structural belt are controlled by faults. Based on the analysis of mechanism and influencing factors of fault sealing, three methods were used to interpret the results of Nanbaxian tectonic interpretation, drilling sand and shale thickness data, and using the ratio of sand to ground in the faulted strata, mudstone smearing coefficient and fault mobility, The seismograms of the faults of Xianbei fault and the faults (8), (14), (21), (25), (26), (27), (28) and (41) formed in the same period were evaluated.