The tubular cave system resulted from erosion in Dongwu stage are the main reservoir space of Lower Permian limestone reservoirs in Sichuan Basin.The cave system were burried first

then filled up and eroded and finally reformed by Himalayan tectonic fractures.The geological model of the reservoirs could be described as a combination of tubular caves system of Dongwu stage and Himalaya tectonic fracture network.It is proposed that the place where Dongwua stage cave system developed and the place where unicline and syncling developed should be taken as furthur exploration areas.