1.Geodetection and Information Technology Institute, China University of Geosciences，Beijing 100083, China；2.Shanxi Shandi Geophy-Tech Co. Ltd.，Jinzhong 030600, China；3.Resources and Information Technology Institute, China University of Petroleum, Beijing 102249,China
The study area is in a high mine-gas coalfield, and the detection of the development of deflection and collapse columns is an urgent task. In view of the facts that it is difficult for the poststack time migration method to achieve accurate structure-oriented imaging of deflection and that this method has multiplicity of solutions in coalfield seismic exploration, this paper, from the applied advantage of Kirchhoff prestack migration technology, used 3D seismic data of the Yangquan coalfield, followed the amplitude-preserving principle, conducted the careful prestack noise attenuation and fine static correction, and eventually completed the prestack time migration processing through fine velocity analysis and migration parameters selection. The application results show that, in comparison with poststack migration, prestack time migration processing has obtained deflection imaging with high accuracy, high interpretation reliability, and low multiplicity of solutions. In addition, It improves the amplitude response of collapse columns by amplitudepreserving processing, and raises the discrimination ratio. Hence prestack time migration of amplitudepreserving is an effective method for high accuracy 3D structureoriented seismic exploration in complex mining areas.
