基于Xu-White模型横波速度预测的误差分析  

Error analysis of shear-velocity prediction by the Xu-White model

作　　者：白俊雨[1] 宋志翔[1] 苏凌[1] 杨文广[1] 朱凌燕[1] 李诗倢 

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院,南京210014 [2]四川省地质矿产勘查开发局物探队,成都610031

出　　处：《地球物理学报》2012年第2期589-595,共7页Chinese Journal of Geophysics

基　　金：国家科技重大专项项目(2011ZX05035)资助

摘　　要：在砂泥岩剖面中,基于Gassmann方程和Xu-White岩石物理模型,利用常规测井资料及实验室岩石物理数据进行横波速度估算.模型中考虑了泥质砂岩中基质性质、泥质含量、孔隙度大小和孔隙形状以及孔隙饱含流体性质对岩石速度的影响.综合分析了模型中砂、泥岩和孔隙流体弹性参数以及孔隙纵横比等输入参数的误差对预测横波速度精度的影响.数值模型试验表明,在Xu-White模型中采用变化的孔隙纵横比估算出的横波速度远远比采用固定孔隙纵横比估算出的横波速度准确.We developed a method to predict shear-wave velocity in shale sandstone from conventional log data and experimental data, using the Gassmann＇s equations and the Xu-White model. It not only considers the effects of rock matrix and fluid inclusions, but also the porosity and pore shapes. The influence of errors of input parameters on the precision of prediction of S- wave velocities is analyzed. Numerical experiments show that the variable aspect ratio method provides an important improvement in the application of the Xu-White model for sand-clay mixtures as compared to the fixed aspect ratio assumption. This method has shown a significant improvement in predicting the velocities over the conventional Xu-White model.

关 键 词：XU-WHITE模型 横波速度 孔隙纵横比 GASSMANN方程 

分 类 号：P631[天文地球—地质矿产勘探]