• 应用地球物理学Ⅰ •

### 砂岩储层压实过程中孔隙度演化的定量分析

1. 1. 延长油田股份有限公司志丹采油厂, 陕西延安 717500;
2. 西安石油大学石油工程学院, 西安 710065
• 收稿日期:2017-04-04 修回日期:2017-09-24 出版日期:2017-12-20 发布日期:2017-12-20
• 通讯作者: 罗然昊,男,1972年生,湖北钟祥人,硕士,高级工程师,现从事开发地质和精细注水研究工作.(E-mail:1419592269@qq.com) E-mail:1419592269@qq.com
• 作者简介:张创,男,1981年生,陕西渭南人,博士,高级工程师,现从事储层评价与油田开发研究工作.(E-mail:zhangchuang530@126.com)
• 基金资助:

自然科学基金项目（41102081）资助.

### Quantitative analysis of porosity evolution in compacting process of sandstone reservoirs

ZHANG Chuang1, LUO Ran-hao1, GAO Hui2, ZHOU Xue1, WANG Cheng-long1

1. 1. Zhidan oil Production Plant, Yanchang Oil Field Company Limited, Shanxi Yan'an 717500, China;
2. College of Petroleum Engineering, Xi'an Petroleum Institute, Xi'an 710065, China
• Received:2017-04-04 Revised:2017-09-24 Online:2017-12-20 Published:2017-12-20

Abstract:

The characteristics of porosity evolution in compacting process of sandstone reservoirs, are main research contents of diagenesis numerical simulation and reservoir quality predicting. By analyzing and identifying the parameters of porosity and compaction intensity, I studied the rule of varying porosity in the process of compaction and established equations in three types of sandstone reservoir. The results show that, the method that considering IGV as porosity characteristic parameters in the process of compaction and considering the maximum effective stress of skeleton particle as compaction strength characteristic parameters in the process of burial is more reasonable. IGV (Intergranular volume, which is the sum of intergranular pore space, intergranular cement, and depositional matrix) and maximum effective stress are chosen to establishing function. There are two phases of porosity decrease in compacting process, which are quick decrease in shallow burial depth and slow decrease or constant in deep burial depth, and the two phases can be expressed in a unified equation. IGVf can be obtained through thin section analysis. IGVo can be obtained by beard's artificial core experimental results based on the known sandstone structure. The effective stress of skeleton particle can be identified by overburden pressure and formation pressure based on burial history reconstruction. The constant β in the equation, is controlled by content and ductility of ductile grains in sandstones, being 0.058 MPa-1 in rigid-grain sandstone,and 0.146 MPa-1 in sandstone with 75% extremely ductile grains. The application of the equation in three reservoirs with different sandstone classifications, is satisfactory with 3.1% absolute error and 13.8% relative error. The optimum selection of compaction parameter, the establishment of compaction equations and the determination of various parameters in equation are based on the previous research results. The maximum effective stress influenced by multiple factors in the process of compaction, although we obtained satisfactory results from the three different types reservoir examples. This article discusses relationship between effective stress and porosity evolution,Only under ideal conditions that the formation is not obvious overpressure or low-pressure, with vertical effective stress decided by overburden pressure are assumed to be the maximum stress.