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根据物理化学原理,建立了完全封闭条件下构造抬升剥蚀后地层流体压力的定量计算公式。公式显示,在完全封闭条件下构造抬升后的地层压力取决于抬升前的地层压力、地层流体的压缩系数、地层流体的膨胀系数、岩石孔隙体积的压缩系数、抬升前后地层温度的变化和剥蚀厚度。根据流体的压缩系数和膨胀系数及岩石孔隙体积压缩系数的特点,经分析认为对于水层砂岩岩体,构造抬升剥蚀趋向于形成异常低压;对于气层,构造抬升剥蚀趋向于形成异常高压。
According to physico - chemical principle, a quantitative formula of formation fluid pressure after tectonic uplifting and denudation under completely closed condition is established. The formula shows that the formation pressure after complete uplift depends on the formation pressure before uplift, the compression coefficient of formation fluid, the expansion coefficient of formation fluid, the compressibility coefficient of rock pore volume, the change of formation temperature before and after the lift and the erosion thickness . According to the characteristics of fluid compressibility and expansion coefficient and rock pore volume compressibility, it is considered that tectonic uplifting and denudation tend to form abnormally low pressure for the aquifer sandstone, and tectonic uplifting and denudation tend to form abnormally high pressure for the gas layer.