油气藏岩石的应力和应变状态研究

岩石沉积过程中的应变状态为一维应变,而应力状态为三维应力;岩石在油气开采过程中的应变状态为三维应变,应力状态亦为三维应力;实验室测定的岩石压缩系数为三维应变状态下的数值,不需转换就可以直接应用于油藏工程研究;把压缩系数从三维应变状态向一维应变状态进行转换的传统作法是不妥当的,这使得油气藏岩石的弹性能量严重被低估。

Study of Stress and Strain State in Reservoir Rocks

The strain state is assumed to be one dimension strain,while the st ress state appears3D one in process of rock sedimentation.However,during oil-gas production in reservoir rocks,it is shown that both the strain state and the stress one are of3D features.Therefore,the rock compressibility coefficie nts measured in core labs represent the values under the3D strain state,and c an be directly applied to study of related reservoir engineering without necess ary to be converted.It is invalid for traditional practice to convert rock comp ressibility coeffi-cient from3-D strain state to a dimensional one,which ma y allow the elastic energy in an oil-gas reservoir rock to be underestimated ba dly.