GENESIS ANALYSIS OF THE OVERPRESSURE CAUSED BY FLUIDS CHARGE IN KUCHE DEPRESSION
库车坳陷异常高压流体充注成因分析与预测

After the necessary conditions for pressure increase by fluids charge were considered, it was proved that the Mesozoic reservoir in Kuche depression have the necessary conditions to increase its pressure by fluids charging. These necessary conditions are the collocation of gas generation and fluid compartment sealed in period, the collocations of the source rock and reservoir layers in space, the drainage system connecting the source and reservoir and the dynamics of charge. Through the comparison of the mole density-pressure curves of Van der Waals, Redlich-Kwong and ideal gas thermodynamics state equation, a practical equation for pressure increasing was established. Use this equation to estimate the mole amount of the charged fluids in Kela 2 department, the result suggested that fluids charge has made a great contribution for the overpressure of the Mesozoic reservoir. The conclusion was that the fluids charge is one of the main factors for pressure increasing of the Mesozoic reservoir in Kuche depression.