地震工程学报Issue(4)：1109-1114,1122,7.DOI:10.3969/j.issn.1000-0844.2015.04.1109
测井资料 Xu-White 模型预测横波速度的一些新观点
New Viewpoints on S-wave Velocity Prediction Using Xu-White Model Based on Well Logging Data
摘要
Abstract
Physical quantities such as the Poisson ratio and Lame modulus,which represent fluid properties,can be obtained using S-wave velocity.These parameters can be used to reduce the multiple interpretations of seismic amplitudes.Thus,although it is very important to use S-wave velocity in performing seismic data AVO analysis,prestack inversion,and fluid identification, there is seldom information about this velocity in actual logging data.Currently,methods for S-wave velocity prediction can be divided into two types:empirical formula method and theoretical rock-physics-model-prediction method.The former is simple,limited to some exploration area, and requires larger workloads to increase its general overall applicability.Compared with the em-pirical formula method,the rock physics model method is complex,but it has universal applica-tion in different areas.Most rock physics model methods for predicting S-wave velocity assume that the physical parameters of an underground fluid (velocity and density)are not affected by the depth of the stratum or pore aspect ratio.However,this is not a valid assumption even for the most popular rock physics model,the Xu-White model.In fact,the bulk modulus and shear mod-ulus of minerals change with the depth of a reservoir.For fluid parameters,this type of effect will increase.With respect to the pore aspect ratio,its change is fundamentally related to the particle shape formation pressure and porosity,i.e.,it is not constant.The aspect ratio has clearer geo-logical implications:bigger aspect ratios correspond to reservoirs with higher porosity and perme-ability,and lower aspect ratios correspond to reservoirs with lower porosity and permeability.In addition to these parameters,most studies have also neglected some assumptions for the predic-tion of S-wave velocity.In this study,we investigate these assumptions and present a new and improved Xu-White method.We all know that the compressional wave time difference,S-wave time difference,and mineral formation density are affected by depth,which is usually neglected. Tolerance stacks may be large in some special geological situations,which should be investigated by geophysicists in the future.关键词
横波预测/岩石物理模型/测井 Xu-White 模型/孔隙度/弹性模量Key words
S-wave prediction/rock physics model/well logging/Xu-White model/porosity/e-lastic modulus分类
建筑与水利引用本文复制引用
石双虎,邓志文,白光宇,李红星,蔡敏贵..测井资料 Xu-White 模型预测横波速度的一些新观点[J].地震工程学报,2015,(4):1109-1114,1122,7.基金项目
国家自然科学基金(41364004 （）
41104073) （）
