Study on Distribution Characteristics of Coal Reservoir Pressure near NormalFault in Central Shizhuang South Block of Qinshui Basin

To find out the distribution characteristics of coal reservoir pressure near the fault can provide an important basis for the CBM well layoutt. In this paper the typical normal faults in the central Shizhuang south block of Qinshui Basin were taken as the research object, the CBM drainage dynamic liquid level was used to calculate the reservoir pressure, and the distribution characteristics of the reservoir pressure near the normal fault was thus obtained. Through the logging and permeability-displacement pressure test in the lab, analysis was carried out on the influence of the sealing property of the surrounding rock near the fault and the coal seam structure upon the change of the reservoir pressure. The results showed that the coal reservoir pressure in the 700 m range near the normal fault increased exponentially with the increase of the fault distance; over the 700 m range, the reservoir pressure was less affected by the fault. In the influence range of the fault, the main controlling factors for the change of the reservoir pressure were the great change of the coal bodies in different distance to the fault. The research results can provide reference for the CBM well layout near the normal fault.