石油地球物理勘探2025，Vol.60Issue(3)：718-727,10.DOI:10.13810/j.cnki.issn.1000-7210.20240279
各向异性背景下倾斜裂缝储层的地震波频散和衰减特征
Seismic dispersion and attenuation of inclined fractured reservoir under anisotropic background
摘要
Abstract
Underground rocks commonly feature multiscale fractures,which induce fluid motion relative to solid when seismic waves pass through them and thus lead to wave dispersion and attenuation.However,most cur-rent rock physics models assume background media to be isotropic and consider fractures that are horizontally or directionally oriented,often overlooking the elastic properties of rocks with fractures of varying orientations and inclinations across different frequency ranges and less analyzing seismic attenuation caused by fractures.In this regard,this study constructs a rock physics model of fractures oriented in arbitrary directions within a trans-versely isotropic(TI)background.Based on the linear slip fracture model,this study reconstructs the expres-sion form of compliance matrix of fractured rocks for the model under the low-frequency and high-frequency limits,constructs the frequency-dependent compliance matrix of fractured rocks,and incorporates fluid by using the Gassmann equation to develop a physics model for rocks with inclined fractures under the TI background.Using this model,this study analyzes how fluid-filled fractured rock velocity and attenuation vary with fre-quency,fracture inclination and azimuth angle,and quantitatively assesses the influence of background aniso-tropy on elastic properties of fracture media.The results demonstrate significant impacts of fracture inclination and azimuth angle on velocity and attenuation changes.This study underscores the effects of background aniso-tropy on both velocity and attenuation of fractured rocks,highlighting varying effects across different frequencies.关键词
岩石物理建模/裂缝/各向异性/频散/衰减Key words
rock physics model/fracture/anisotropy/dispersion/attenuation分类
天文与地球科学引用本文复制引用
李林鑫,漆乔木,李小斌,孟继昆..各向异性背景下倾斜裂缝储层的地震波频散和衰减特征[J].石油地球物理勘探,2025,60(3):718-727,10.基金项目
本项研究受国家自然科学基金项目"富有机质页岩地震波频散和衰减的理论及实验研究"(42274178)、中国石油天然气集团公司科技创新基金项目"不同构造样式断溶体储层精细预测及量化雕刻技术研究"(2021DQ02-0104)联合资助. （42274178）
