Application of P-wave anisotropy detection in detecting the conducting fracture zone

In order to study the development of water flowing fractured zone in working face,a 3D seismic exploration with wide azimuth,small facet and high coverage was carried out in a coal mine in northern Shaanxi. Limited by the accuracy of seismic exploration,it is difficult to describe the development of fractures in traditional way. A P-wave ani- sotropy detection technology was introduced to study the hydraulic fractured zone in this study. Firstly,the seismic data of different azimuth angles was stacked and offset processed. And then,an ant-tracking was conducted at different azi- muthal offset data,and an anisotropic detection was performed with ant trace data. The anisotropy test which indicates that the fracture development intensity is inversely proportional to the distance from the roof,and the maximum height of fracture is 118 m. With the analysis of anisotropy data and seismic amplitude data,the authors can draw a conclu- sion that the water flowing fractures in the study area have not yet developed to the weathered bedrock surface,and not connected to the aquifer of the Sarawusu Formation. In practice,it shows that the P-wave azimuth anisotropic fracture detection method can accurately predict the distribution characteristics and development height of fractures in hydrau- lic fractured zone.