• 应用地球物理学Ⅰ •

### 砂泥岩干岩石模量估计

1. 中国石油大学(华东)地球科学与技术学院, 青岛 266580
• 收稿日期:2015-12-12 修回日期:2016-03-03 出版日期:2016-06-20 发布日期:2016-06-02
• 作者简介:魏冰涛,男,1990年生,硕士在读研究生,主要从事岩石物理研究.(E-mail:13156050650@163.com)
• 基金资助:

国家重点基础研究发展计划(973)课题(2014CB239006,2011CB202402)和国家自然科学基金(41104069,41274124)联合资助.

### Estimation of the dry rock modulus for shaly sandsone

WEI Bing-tao, YANG Guo-quan, LI Zhen-chun

1. School of Geosciences of China University of Petroleum (east China), Qingdao 266580, China
• Received:2015-12-12 Revised:2016-03-03 Online:2016-06-20 Published:2016-06-02

Abstract:

Fluid substitution is a effective physical tool with which we can understand and predict the variation of seismic wave velocity and its impedance due to the change of pore-fluid. There are two main problems in fluid substitution, such as too many parameters and a great deal of uncertainties. For example, the modulus of dry rocks is the key parameter for the relation of saturated rock and fluid, therefore it is the foundation of Gassmann equation. However, it is pretty difficult to calculate dry rock modulus. Many researchers have made many efforts to estimate dry rock modulus. As a result, many of the classic models have been put forward, such as unconsolidated sandstone model, Kuster and Toksoz model, self-consistent model (SCA), differential effective medium model(DEM), etc. But all these methods due to the limitations of their own assumptions, so they can not obtain satisfactory results when applied to different actual data. In this paper, we propose a new method in order to have a good grasp of the dry rock modulus. This method is inspired by the graphical interpretation of Gassmann equation(Mavko and Mukerji,1995). With the help of the actual sample data, we test these methods and analyze the effect of these algorithms. As we have expected, the new method has a better effect and more attention should be paid to it.