Reservoir pressure can be divided into normal pressure, abnormal high pressure and abnormal low pressure in terms of the ratio between formation pressure and hydrostatic pressure.
根据地层压力与静水压力的比值大小，可将地层压力分为异常高压、异常低压和正常压力三种压力状态。
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。
Abnormal high pressure can prevent underground water, oxygen and bacteria from destroying oil (gas) reservoir.
异常高压可以阻止地下水活动、氧和细菌对油气藏的破坏作用。
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