活动断层探测中断层气真、假异常判别方法

摘要

In the process of active faults detection, outliers may relate to the contaminated point, or may be due to the fault gas produced in the fault activity, and thus there is true and false anomaly. The paper determines the target fault by analyzing the seismic data and the geophysical data, and uses a grid wiring detection methods along the perpendicular direction to the faults. The paper firstly draws the content curve of each measuring line to determine the location of anomalies, and then draws the isoline graph of content to judge the distribution trends of outliers. If there existed the abnormal belt, and the abnormal belt strike is consistent with fault strike, then the anomaly is caused by fault gas. The paper does the interpretation by combining the content graph and isoline map, which provides a new method for fault anomaly explaining.%活断层探测过程中，异常值可能与探测点载体受污染有关，也有可能因为断层活动产生的断层气所致，也就有了“假异常”和“真异常”。通过分析地震地质资料、地球物理解译资料等，确定目标断层；采取垂直断层走向，网格化布线探测方式。先绘制各测线含量曲线图，确定异常值分布位置；再绘制各测线含量等值线图，判断异常值的分布趋势；若各测线含量曲线图中异常值在含量等值线图中形成了一条异常带，且与断层走向一致，则可判定这些异常值是断层气异常。含量曲线图与含量等值线图相结合解释，为断层气真假异常判别提供了一种新方法。