Characteristics of fluid substitution in porous rocks

作     者：Li Shengjie Li Shengjie School of Resource and Information Technology,China University of Petroleum,Beijing 102249,China State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China Key Laboratory of CNPC Geophysical Exploration,China University of Petroleum,Beijing 102249,China

作者机构：School of Resource and Information Technology China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of CNPC Geophysical Exploration China University of Petroleum Beijing 102249 China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2009年第6卷第2期

页      面：139-145页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 080104[工学-工程力学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Basic Research Program of China (Grant No.2007CB209601) 

主　　题：Fluid substitution velocity bulk modulus porosity saturation 

摘      要：Analysis of the effect of changes in fluid properties of rocks on the compressional-wave velocity VP and shear-wave velocity Vs is very important for understanding the rock physical properties, especially in oilfield exploration and development. The fluid substitution process was analyzed by using ultrasonic measurement and theoretical calculations. The results showed that the effect of fluid substitution on the rock elastic modulus was mainly controlled by fluid properties, saturation, and confining pressure. For a rock with specific properties and porosity, the result of theoretical prediction for fluid substitution accorded with the experimental result under high confining pressure （higher than 60 MPa for our experimental data）, but failed to describe the trend of experimental result under low confining pressure and VP predicted by Gassmann＇s equation was higher than that measured by experiment. A higher porosity resulted in stronger sensitivity of the bulk modulus of saturated rocks to the change of fluid properties.