岩石的临界孔隙度反演及横波预测
张佳佳1，2 ，李宏兵1 ，姚逢昌1
1. 中国石油勘探开发研究院，北京 100083
Rock critical porosity inversion and S-wave velocity prediction*
Zhang Jia-Jia1,2 , Li Hong-Bing1 , and Yao Feng-Chang1
1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China.
摘要 临界孔隙度模型是利用岩石的临界孔隙度来计算岩石骨架的弹性模量，岩石的临界孔隙度值受到很多因素的影响，而实际应用中通常无法获得准确的临界孔隙度值，只能选取经验临界孔隙度值，就会给岩石物理建模带来误差。本文提出了一种利用纵波速度反演岩石的临界孔隙度的方法，并且把它应用于横波预测中。实验室和测井数据应用结果表明本文提出的方法可以降低以往选取经验值带来的不确定性，并且能够为横波预测提供准确的临界孔隙度值，提高了横波预测的精度。
关键词 ： Gassmann方程
岩石骨架
临界孔隙度
临界孔隙度模型
横波预测
Abstract ：
A critical porosity model is often used to calculate the dry frame elastic modulus by the rock critical porosity value which is affected by many factors. In practice it is hard for us to obtain an accurate critical porosity value and we can generally take only an empirical critical porosity value which often causes errors. In this paper, we propose a method to obtain the rock critical porosity value by inverting P-wave velocity and applying it to predict S-wave velocity. The applications of experiment and log data both show that the critical porosity inversion method can reduce the uncertainty resulting from using an empirical value in the past and provide the accurate critical porosity value for predicting S-wave velocity which signifi cantly improves the prediction accuracy.
Key words ： Gassmann’s equations, dry frame critical porosity critical porosity model S-wave velocity prediction
收稿日期: 2011-04-19;
基金资助: 国家科技重大专项（编号：2011ZX05018-001）资助
引用本文:
张佳佳,李宏兵,姚逢昌. 岩石的临界孔隙度反演及横波预测[J]. 应用地球物理, 2012, 9(1): 57-64.
ZHANG Jia-Jia,LI Hong-Bing,YAO Feng-Chang. Rock critical porosity inversion and S-wave velocity prediction*[J]. APPLIED GEOPHYSICS, 2012, 9(1): 57-64.
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