Methods and Application of the Formation Pressure Forecast Combining Vp and Vs

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  • Northwest Branch of Research Institute of Petroleum Exploration & Development,CNPC,Lanzhou 730020,China

Received date: 2013-12-27

  Revised date: 2014-03-16

  Online published: 2015-02-10

Abstract

 
It suggests that the shale gas content,regardless of the free gas or the adsorbed one,increases with the formation pressure.Therefore,it is of significance to carry out the fine formation pressure forecast to improve the shale gas production.Current studies on the pressure forecast are mainly based on the fact that the P-wave velocity decreases with the increasing formation pressure.The P-wave velocity change,however,depends not just on the formation pressure change.So in order to build a high-precision forecast model of the formation pressure,we start with the definition of the Young′s and Bulk modulus,deduce the relationship between the effective stress and the Vp and Vs  combined with the wave equation,and develop a new forecast method,Elastic Parameters Combination,to calculate the formation pressure.By introducing the S-wave velocity,this method reduces the multiplicity of the pressure forecast,improves the accuracy,and demonstrates its effectiveness through the application on the shale gas strata.
 

Cite this article

WANG Bin,YONG Xue-shan,PAN Jian-guo,TENG Tuan-yu,YIN Lu,XU Duo-nian,HUANG Yu,KONG Xu .

 
Methods and Application of the Formation Pressure Forecast Combining Vp and Vs
[J]. Natural Gas Geoscience, 2015 , 26(2) : 367 -370 . DOI: 10.11764/j.issn.1672-1926.2015.02.0367

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