被动源地震干涉成像技术在煤田采空区探测中的应用研究

Study on the application of passive seismic interferometric imaging technology in the detection of goaf in coalfield

地震干涉方法能够从背景或环境噪声中提取有效信息并应用于地下地质构造成像。通过对煤田采空区产生的被动源地震信号进行干涉成像可以定位出采空区的范围。笔者等基于被动源干涉成像原理,采用被动源地震干涉方法进行震源定位研究。通过对不同界面数值模型进行被动源干涉成像测试,验证了方法的准确性,而且测试结果表明被动源干涉成像横向分辨率高于纵向分辨率,不同的偏移速度对纵向位置影响较大,但对横向位置定位几乎没有影响。最后将其应用于实际煤田的采空区定位,成像结果与实际情况相符,验证了笔者等提出的被动源地震干涉成像方法的有效性以及在实际煤田采空区探测应用中实用性。

Seismic interference method can extract effective information from background or environmental noise and be applied to subsurface geological structure imaging.The scope of goaf can be located by interferometric imaging of passive source seismic signals generated in coalfield.Based on the principle of passive source interference imaging,this paper adopts passive source seismic interference method to study the source location.Through the passive source interference imaging test of different interface numerical models,the accuracy of the method is verified.In addition,the results show that the lateral resolution of passive source interference imaging is higher than the longitudinal resolution.Different migration velocities have a great influence on the longitudinal position,but have little influence on the lateral position.Finally,it is applied to the location of goaf in actual coalfield,and the imaging results are consistent with the actual situation,which verifies the effectiveness of passive source seismic interference imaging method in this paper and its practicability in the detection application of goaf in actual coalfield.