An evaluation system of hydrocarbon-bearing availability of fault traps was established based on the comprehensive analysis of fault segment growth history, fine reservoir anatomy and geochemistry tracing, with the Qikou sag in the Bohai Bay Basin as target area. The displacement/separation transform and displacement gradient method were used to prove the interpretation reliability of fault traps. The method of maximum throw subtraction was used to recover the history of fault growth and determine the availability of the forming period of fault traps. Based on the quantitative relationship between shale gouge ratio and cross-fault pressure difference of known reservoirs in southern Qikou sag, the critical shale gouge ratio of fault lateral sealing was calculated at 20%, and the quantitative evaluation chart based on the relationship of “fault throw–sand-formation ratio and hydrocarbon column height” was constructed. Based on the results of reservoir fine anatomy and quantitative fluorescence tracing test shale smear factor method is suitable for evaluating the vertical sealing of faults in the caprock of the middle submember of first member of Paleogene Shahejie Formation, and the shale smear factor critical value is 3.5. The juxtaposition thickness method is suitable for evaluating vertical sealing of faults in the caprock of the second member of Paleogene Dongying Formation, and the critical juxtaposition thickness of fault is 70–80 m. By combining four factors, the availability of fault trap interpretation, the availability of the forming period of fault trap, the availability of fault lateral sealing and the availability of fault vertical sealing, the comprehensive evaluation chart on hydrocarbon-bearing availability of fault traps in Qikou sag has been established, which provides a reasonable basis for risk assessment of fault traps.

以渤海湾盆地七口凹陷为目标区，基于断层发育历史、精细储层解剖和地球化学示踪等综合分析，建立了断层圈闭含油气性评价体系。采用位移/分离变换和位移梯度法验证断层圈闭解释的可靠性。采用最大投减法恢复断层生长历史，确定断层圈闭形成期的有效性。根据七口凹陷南部已知储集层泥页岩泥比与断层间压差的定量关系，计算出断层侧向封闭临界泥岩泥比为20%，并构建了基于“断层-成砂比与烃柱高度”关系的定量评价图。基于储层精细解剖和定量荧光示踪试验结果，页岩涂抹因子法适用于评价古近系沙河街组中段中亚段盖层断层的垂向封闭性，页岩涂抹因子临界值为3.5 . 并列厚度法适用于评价古近系东营组二段盖层断层的垂向封闭性，断层临界并列厚度为70～80 m。综合四个因素，断层圈闭解释的可用性、断层圈闭形成期的可用性、