有效应力对低渗低孔介质孔渗参数的影响

随着油田开发，地层内孔隙压力逐步降低，岩石骨架所受到的有效应力随之增大，岩石的物性参数也随之改变，主要表现为渗透率降低，孔隙度减小。本文主要研究了低渗透多孔介质的孔隙度、渗透率和孔隙体积压缩系数与作用在岩石上的有效应力的关系实结果表明有效应力对渗透率的影响较大，产生不可逆伤害，而对孔隙度的影响较小，孔隙压缩系数仅仅是有效应力的函数。

The Effect of Effective Stress on the parameter of the low Permeability Porous Medium

During the development of the oil field, the pressure of the formation decreases with production, and the effective stress on grain increases. The parameters of the core, the rermeability, porosity and compressibility vary with the effective stress. In this paper the research on the relationship between effective stress and permeability, porosity and compressiblility is carried out .The results indicate that the permeability varies sensitively with effective stress, and it is not reversible. The porosity varies little with effective stress and it is reversible. The compressibility of the core is just the function of the effective stress.