中国石油大学学报（自然科学版）2025，Vol.49Issue(2)：118-130,13.DOI:10.3969/j.issn.1673-5005.2025.02.010
孔弹性介质快慢纵波及横波真振幅矢量波场分离方法
A true-amplitude vector wavefield decomposion method for fast-P,slow-P and S-waves in poroelastic medium
摘要
Abstract
The poroelastic theory considers the properties of both the underground solid matrix and pore fluids,allowing for accurate description of seismic wave propagation in a two-phase medium compared to elastic theory.However,in a poroelas-tic medium,there are three fundamental wave modes,namely fast P wave,slow P wave,and S wave,which become coupled during propagation.The quality of seismic imaging can be significantly degraded if these modes are not properly separated.In this paper,a true-amplitude vector wavefield decomposition method for poroelastic media is proposed to fully decouple the three fundamental wave modes.First,by introducing an auxiliary Poisson's equation,the coupled wavefields in the solid and fluid phases are decomposed into true-amplitude vector P and S wavefields.Then,a double-cross-product method based on eigenvalue and eigenvector analysis is applied to separate the fast and slow P waves.Model test results confirm that the pro-posed method achieves high accuracy and reliability in wavefield separation.The results demonstrate that this method can completely separate the fast P wave,slow P wave,and S wave in poroelastic media in vector form while preserving their origi-nal amplitudes,phases,and physical units.关键词
孔弹性介质/矢量波场分离/快慢纵波/本征型分析Key words
poroelastic medium/vector wavefield decomposition/fast and slow P-waves/eigenform analysis分类
天文与地球科学引用本文复制引用
杨继东,田祎伟,张鑫,黄建平,郭威,杨永红..孔弹性介质快慢纵波及横波真振幅矢量波场分离方法[J].中国石油大学学报（自然科学版）,2025,49(2):118-130,13.基金项目
国家自然科学基金优秀青年项目(海外)(ZX20230152) （海外）
山东能源集团深层高温地热重大科技项目(HX20230299) （HX20230299）
国家自然科学基金面上项目(ZX20240185) （ZX20240185）
