Dolomite in the Jia2 Member of the Tongnanba area is mainly doloarenite,where growth many types of dissolved pore,cavern and fracture.The drilled wells show favorable gas-oil prospect,but the member is so old,deep and has bad reservoir conditions that make reservoir prediction and hydrocarbon detection is difficult.In this paper,the target dolomite stratum is lucubrated by stress-strain analyze,volume coherence technique,multi-azimuth prediction of fracture,frequency attenuation gradient analyse based on the 3D seismic data of the area.The fracture and cave has been predicted.The fluid distribution has been forecasted.