Seismic Response Characteristics of Coal Goaf Based on Forward Modeling

Since the goaf of the upper coal group has an important influence on the imaging and safe mining of the lower coal group, it is necessary to study the accurate imaging technology of the goaf of the upper coal group in the mining area. For the prediction of the seismic response characteristics of the actual goaf and its subgroups of coal, the establishment of a forward model consistent with the actual geological conditions is the basis. In this paper, based on the logging data collected in the mining area, relevant data of modeling are obtained, and a geological model is established which is close to the geological situation of the mining area. Through the forward modeling, the horizontal superposition section and the migration section are analyzed. The characteristics of the wave field in the goaf are time delay, amplitude change, frequency reduction and significant influence on the lower reflected wave. Besides, the time difference in the dry goaf is greater than that in the water-bearing goaf. Through the extraction and analysis of different seismic attributes, it is found that the seismic attributes of the goaf are obviously different from those of the normal coal seam, and the seismic attributes of the dry goaf are more different from those of the normal coal seam.