饱水石灰岩骨架和流体弹性参数的估算  

Estimation of component elastic parameters from saturated limestone samples

作　　者：邹荃[1,2] 牛滨华[1] 孙春岩[3] 郭继亮[1] 

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083 [2]中国石油勘探开发研究院非洲研究所,北京100083 [3]中国地质大学(北京)工程技术学院,北京100083

出　　处：《石油地球物理勘探》2011年第5期763-768,836+664,共6页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(40874052);中国科技部863高科技计划海洋环境领域课题(2007AA09Z309)联合资助

摘　　要：本文利用Niu等提出的基于临界孔隙度模型的组分弹性参数数值计算方法,把测试岩石样品的孔隙度、整体密度、纵波速度和横波速度作为数值计算的输入数据,运用"双线性数值计算方法"反演求出临界点、流体和骨架的12个弹性参数。具体做法是:基于临界孔隙度模型,给出三组线性关系,即密度—孔隙度,整体剪切模量—孔隙度,整体纵波模量—孔隙度,上述每组线性关系分别以孔隙度作为自变量和因变量得到两个线性方程,再把两个方程计算的结果进行加权平均得到相关的弹性参数估算值,并结合饱水石灰岩样品数据实现了弹性参数估算。数值计算结果表明,由数值计算得到的弹性参数与测试弹性参数的均值和方差相差甚微,特别是密度数据的偏差均值更小,说明文中的数值计算结果是可靠的。In this work,12 component elastic parameters are calculated from the measured overall density and velocities data in different porosities,based on critical porosity model and bilinear numerical inverse method.The process is as follow.Firstly,three linear relations,such as between porosity and density,P-wave modulus as well as shear modulus,are obtained,based on the critical porosity model.Each relation can be expressed as two linear equations which are used on inversion,and mean value of these two results from both equations is considered as the estimated value.This method is used to inverse component elastic parameters of saturated limestone and the difference between the calculated component elastic parameter and measured ones is tiny,especially in density data.The results show the reliability and efficiency of this method.

关 键 词：弹性参数估算 饱水石灰岩 孔隙流体 组分弹性参数 

分 类 号：P631[天文地球—地质矿产勘探]