Analyzing the mid-low porosity sandstone dry frame in central Sichuan based on effective medium theory

作     者：晏信飞 姚逢昌 曹宏 巴晶 胡莲莲 杨志芳 

作者机构：中国石油勘探开发研究院物探技术研究所北京100083 中国石油天然气股份有限公司地球物理重点实验室北京100083 中国地质大学(北京)北京100083 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2011年第8卷第3期

页      面：163-170,239页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Foundation of China (No. 41104066) the Basic Research Programs of CNPC during the 12th Five-Year Plan Period (No. 2011A-3601) the Major State Basic Research Development Program of China (No. 2007CB209505) RIPED Young Innovation Foundation (No. 2010-A-26-01) 

主　　题：tight sandstone dry frame Mori-Tanaka model pore aspect ratio inclusion 

摘      要：Tight gas sandstone reservoirs in Guang＇an are characterized by wide distribution and low abundance. Sandstone samples from this area usually have low porosity and poor connectivity. We analyze the observed velocity data of tight sandstone samples with the Mori- Tanaka model, and give the sandstone framework physical model in this area based on theory and experiment analysis. The matrix modulus was obtained by an empirical relationship and then the experiment data were compared with the values predicted by the Mori-Tanaka model with different pore shapes. The results revealed that the experiment data were close to the model with low pore aspect ratio. Considering the matrix modulus and pore shape variation, we find that, under the condition of small mineral composition change, the effective pore aspect ratio of these samples increased with porosity evidently.