High density 3D seismic data-driven comprehensive interpretation method of magmatic intrusion zones in coal seams and its application

Magmatic rock intrusion is present in most of the main coal seams in Huaibei mining area, is characterized by multi-layer intrusion, wide spatial distribution and complex intrusion modes, etc. Conventional seismic exploration can't guarantee the interpretation accuracy. Focused on the problem, the seismic response characteristics of different magmatic intrusive modes are compared and analyzed based on the high density 3D seismic exploration. The seismic multi-attributes analysis technology based on rock physical property difference, the seismic facies analysis technology based on waveform difference and the log constrained impedance inversion technology based on impedance difference are comprehensively utilized to identify and interpret the magmatic intrusive area, and the spatial distribution are carved in detail. The results show that the log constrained impedance inversion has high precision in thin layered magmatic intrusive area, and the prediction of thick layered magmatic intrusive area can rely on seismic attribute analysis and seismic facie analysis. Therefore, according to the coal seam distribution and the characteristics of intrusive magmatic rock, the seismic attribute technology, seismic facies technology and seismic impedance inversion technology can be used comprehensively to effectively depict the distribution of magmatic rock in coal seam.