基于重力水平总梯度倾斜角的加强处理方法在断裂识别中的应用

Application of Enhanced Processing Method Based on Gravity Horizontal Total Gradient Tilt Angle in Fracture Identifi cation

断裂两侧因密度差异而产生重力异常带,对水平总梯度方法处理的重力异常,通过极值点的追踪,进行断裂识别。对于埋深较大的深大断裂和中等埋深的次一级断裂,要在重力水平总梯度基础上,利用倾斜角的概念,对重力水平总梯度异常进行“倾斜角”加强处理,实现对弱异常的增强提取,进而识别出更多断裂信息。利用重力水平总梯度倾斜角的加强处理方法,在博格达山前复杂构造带米泉地区预测了区域性深大断裂及次一级断裂的发育特征,综合电法预测成果,研究区发育逆冲或逆掩断层,断裂识别结果对断裂发育模式的认识具有重要的辅助作用。

Gravity anomaly zones are generated on both sides of the rupture due to the density difference,and the gravity anomalies processed by the horizontal total gradient method are traced by the extreme value points for rupture identification.For the deep and large fractures with large burial depths and secondary fractures with medium burial depths,the concept of tilt angle is used to enhance the processing of the gravity total gradient anomalies based on the gravity total gradient,so as to realize the enhanced extraction of weak anomalies and then identify more fracture information.Using the enhanced processing method of the tilt angle of the total gravity gradient,the development characteristics of regional deep and large fractures and secondary fractures are predicted in the Miquan area of the complex tectonic zone in front of the Bogda Mountains.The results of the integrated electric method prediction show that the study area has developed reverse thrust or reverse mask faults,and the fracture identification results play an important role in recognizing the fracture development mode.