Abstract: Based on regional geologic information and core analysis data in Suqiao, Wenan area in center Hebei province, this paper discussed the rock types, percolation features and pore structures of clastic rocks in Carboniferous and Permian, and analyzed factors affected the percolation features.It is considered that sandstone reservoir in Carboniferous and Permian are poor in petrophysical property, but are still better reservoirs for accumulating hydrocarbons. The petrophysical property of reservoir may become better if there is weathering denudation in sedimentary discontinuity and developed structural fractures in some area.

Key words: Northern China area, Carboniferous, Permian, Strata, Clastic rock, Reservoir, Characteristic