Buried Structure 3D Seismic Interpretation of Coal Mining District and Its Safety Influence on Coal Mine

In order to ascertain the buried structure distribution, the structural forms and faulted structure of major coal seams in the mining area has been obtained through full 3D horizon tracking and multi seismic attribute fault identification. A total of 817 faults in the whole area are interpreted, the faulted structures have a dominant NW-NWW strike and secondary NE strike, reverse faults are developed and those faults grow up to the surface and dip into coal seam floor. Based on the 3D seismic interpretation result as well as collapse depth and fractured extent, the buried structure zones are divided into normal zone, influence zone and fault depression zone. The buried structure zones have a broom-like distribution in map view, while in profile, they have large fault displacement in shallow formations and small fault displacement in deep formations, which has fault depression characteristics. Faults within the buried structure zones can connect through all aquifers from upper unconsolidated formations to lower karst fissure bearing limestone formations, each aquifer may have relation with one another, therefore, the buried structure zones lead to water bursting risks. As mining depth goes deeper and mining impact increases, water bursting risks of buried structure zones also increase.