铲式正断层几何形态定量预测与应用——以南黄海盆地南部拗陷为例

Quantitative prediction of listric normal fault geometry and its application——taking southern depression of southern Yellow Sea basin for example

受众多因素的影响,南黄海盆地南部拗陷中深部地震资料品质较差,对于主控断层深部几何形态及其滑脱深度认识不清,从而导致对上盘深部地层产状、内部构造缺乏正确的认识.为了确定主控正断层在深部的几何形态,以研究区内2条典型的主控正断层为例,综合利用断层浅部资料、上盘当中对比标准层资料及倾斜剪切角,采用倾斜剪切法对断层深部的几何形态进行预测.结果表明:倾斜剪切法模拟的主控断层深部几何形态与现实情况符合度高,具有较好的应用效果.将该方法推广到南黄海盆地南部拗陷的地震解释中,可以提高解释准确度,加深对该地区构造特征的认识.

Affected by many factors,the deep seismic data is poor in the southern depression of southern Yellow Sea basin.Due to the reason above,geometry and slipping depth of the master fault in the deep are not understood clearly,which result in the misunderstanding of the stratum attitude and internal structure of hanging wall in the deep.In order to determine the deep geometry of the master fault,we predicted the geometry of two typical master faults in the deep by using inclined shear method based on the comprehensive utilization of geophysical data,geometry of shallow strata,the reference layer in the hanging wall and inclined shear angle in the study area.The results show that the geometry of master fault in the deep modeled by inclined shear method is consistent with the reality and the inclined shear method has a good application effect.If we popularize this method to the seismic interpretation of southern depression of southern Yellow Sea basin,improvements can be made in the exploration accuracy and better understanding of the tectonic features in the study area can be achieved.