Many experiments show that: when a well produces oil from a reservoir,the porosity and permeability will decrease,as fluid pressure drops,especially for reservoirs with abnormal high pressure.

• 大量实验表明:当油藏生产原油时,随着地层中流体压力的降低,油层的孔隙度和渗透率下降,特别是在异常高压油藏中尤为显著。