地面渗透率与地下渗透率的关系

The Relationship Between Surface and Subsurface Rock Permeability

岩石的地面渗透率是在常压、常温下测量的。地层中的压力和温度都比地面高,岩石在地层中因为压力升高而压缩,致使渗透率有所降低;因为温度升高而膨胀,致使渗透率增大。通过研究,给出了通过地面渗透率计算地下渗透率的公式。计算公式综合考虑了压力和温度的影响。计算结果表明,地下渗透率与地面条件下的渗透率相差甚微。

The permeability of rock is usually measured at common pressure and temperature on surface. However, the pressure and the temperature underground are much higher than that on surface condition. The permeability of rock decreases due to compression at higher pressure, and increases due to thermal expansion at higher temperature. A theoretical formula is proposed in this paper to calculate the permeability of rock underground from the permeability measured on surface condition. The formula takes account of the influences of pressure and temperature on the rock permeability. The calculations by the formula show that the permeability of rock underground is not much different from that measured on surface condition.