天然气地球科学

• 天然气勘探 • 上一篇    下一篇

纵横波速度联合预测地层压力的方法及应用

王斌,雍学善,潘建国,滕团余,尹路,许多年,黄玉,孔旭   

  1. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020
  • 收稿日期:2013-12-27 修回日期:2014-03-16 出版日期:2015-02-10 发布日期:2015-02-10
  • 作者简介:王斌(1985-),男,甘肃会宁人,工程师,硕士,主要从事测井技术与沉积储层研究. E-mail:wangbin_xds@petrochina.com.cn.
  • 基金资助:

    国家重大专项专题“天然气复杂储层预测与烃类检测地球物理技术研究和应用”(编号:2011ZX05007-006)资助.

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

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

  1. Northwest Branch of Research Institute of Petroleum Exploration & Development,CNPC,Lanzhou 730020,China
  • Received:2013-12-27 Revised:2014-03-16 Online:2015-02-10 Published:2015-02-10

摘要:

研究表明,在页岩气中无论是游离气含量还是吸附气含量都随着地层压力的增加而增加,因此开展精细的地层压力预测对提高页岩气的产量有重要意义。目前主要利用纵波速度随着地层压力的升高而降低的特点开展压力预测,但是地层纵波速度的变化并不仅仅由地层压力的变化决定,因此为了建立高精度的地层压力预测模型,分别从杨氏模量和体积模量的定义出发,结合波动方程推导了有效应力与纵波、横波速度之间的关系,开发出了一种新的预测地层压力的方法——弹性参数联合法来计算地层压力。该方法通过引入横波速度,降低了压力预测的多解性,提高了预测的精度,并在页岩气地层中取得了良好的应用效果。
 

关键词: 横波速度, 弹性模量, 纵波速度, 有效应力, 异常压力

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.
 

Key words: S-wave velocity, Elastic modulus, P-wave velocity, Effective stress, Abnormal pressure

中图分类号: 

  • TE132.1

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