降雨能使火烧迹地的土壤密度和分散系数升高、孔隙度下降。
Rainfall makes the soil density and disperse coefficient increased and porosity decreased.
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。
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.
试验结果表明该类岩心的孔隙度和渗透率随压力增大呈近指数规律下降。
It is concluded that porosity and permeability of the core are declined with the increase of pressure.
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