Abstract: The key problems of exploration and development are the thin reservoir thickness, rapid lateral variation and spatial distribution of reservoir and cap rock,in the lower Cretaceous continental clastic rock of Jinshan gas field.Based on the three-dimensional high-resolution seismic data of Longshan and the first member of Shahezi Formation as the main research stratum, this paper predicts the distribution of favorable reservoirs and cap rock by petrophysical analysis, curve smoothing filtering, fault constraint modeling and post-stack stochastic inversion, which combines with the structure and fracture to implement the favorable structural-lithologic traps. It has achieved good application results.