Rock critical porosity inversion and S-wave velocity prediction  

岩石的临界孔隙度反演及横波预测(英文)

作　　者：张佳佳[1,2] 李宏兵[1] 姚逢昌[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《Applied Geophysics》2012年第1期57-64,116,共9页应用地球物理（英文版）

基　　金：sponsored by Important National Science and Technology Specifi c Projects of China (No.2011ZX05001)

摘　　要：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 significantly improves the prediction accuracy.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＇s equations dry frame critical porosity critical porosity model S-wave velocity prediction 

分 类 号：P585[天文地球—岩石学]