Method to locate igneous rock intrusion of coal bed using P-wave data

Combined with impendence inversion method, seismic facies analysis and spectral decomposition technique, we can locate the intrusion area of igneous rock using P-wave data and well logging data. When magmatic rock directly intruded into coal bed, it is not very hard to locate the intrusion area by impendence inversion because of the existing of big impendence difference between coal bed and magmatic rock. Regarding coked coal region. How to map it has not been solved properly because of the small impendence difference between coal bed and cokeite. In this paper, we put forward an effective method to map the intrusion region by comprehensive contrasting of spectral decomposition technique, seismic facies analysis and impendence inversion technique. Then, this method was used to predict the intrusion area of igneous rock on Xuzhuang coal mine, and the predicted outcomes accord very well with validating drills.