Abstract:It is an important issue for coal seismic survey to detect lithologic distribution,to verify the existence and distribution characteristics of aquifuge in the upper portion of Ordovician system indirectly,and to solve water inrush problem on coal bottom for mining safety by utilizing 3D seismic results. Seismic inversion is one of important techniques in lithologic seismic survey. It combines both logging data with high vertical resolution and seismic data that are collected continually,improving both vertical and horizontal resolutions of 3D seismic data,and it can improve the study level of underground conditions. 3D seismic data in the test area are inversed by seismic inversion;and spacing distribution and thickness variation of both aquifer and aquifuge in the upper portion of Ordovician system are also determined. Researching results show that there is a aquifuge in the upper portion of Ordovician system,and the achieved results can lay a solid foundation for the water quantity forecasting model in mining water inrush.