在用地震波速度数据来反演油藏孔隙压力的时候,岩石的有效压力是一个非常重要的概念。很多情况下,有效压力ΔP被定义为上覆岩层的压力Pc与孔隙压力Pp之间的差值。然后,这并不能十分真实的描述岩石的实际有效压力,需要将岩石骨架的可压缩性和孔隙的模量考虑进去。在实际的超压地层中,由于不同地层压力的加载历史,岩石有效压力系数的值会不同。因此,我们基于实验室超声波速度-有效压力数据来分析有效压力系数。 The effective pressure of rock is a very important concept when using seismic velocity data to retrieve reservoir pore pressure. In many cases, the effective pressure ΔP is defined as the difference between the pressure Pc of the overburden and the pore pressure Pp. However, this does not give a very realistic description of the actual effective pressure of the rock. It is necessary to take into account the compressibility of the rock skeleton and the modulus of the pores. In actual overpressured formations, the effective pressure coefficient of rock will vary in value due to the loading history of different formation pressures. Therefore, we analyzed the effective pressure coefficient based on laboratory ultrasound velocity-effective pressure data.