We sum up the reservoir space types and characteristics of clastic rock reservoir ShiWu fault depression rift layer study area, through core observation, microscope, scanning electron microscope and mercury injection methods, and discuss the development characteristics and formation mechanism of pore and fracture. A large number of core analysis, drill results and test mining research has confirmed that the study area is constructed by the strong force, the micro-cracks are well developed, it is not only important reservoir space, but also the flow of oil and gas wells to obtain high yield important seepage paths, is to obtain yield the necessary conditions.