石油地球物理勘探2025，Vol.60Issue(2)：401-408,8.DOI:10.13810/j.cnki.issn.1000-7210.20240141
基于纵波资料弹性参数反射波旅行时反演
Elastic reflection travel-time inversion based on pure P-wave data
摘要
Abstract
To solve the problem that the P-wave data collected from land explorationcannot meet the increasing demand for elastic multi-parameter model prediction,this paper proposes a new wave equation of the acoustic-elastic equation coupled mode in elastic media,which is derived by decomposing the constitutive equation in classical elastodynamics into dilatation and shear tensors.The equation can perfectly match P-wave data,and waveform information contains P-and S-wave velocity and density responses,which can be used to invert elas-tic multi-parameter models.Then,the paper establishes a theoretical framework for elastic reflection travel-time inversion based on P-wave data.Since full waveform inversion is a highly nonlinear method,accurate ini-tial velocity modeling is particularly important.Therefore,this paper introduces reflection waveform inversion to recover the middle-and low-wavenumber information in the background model by imaging along the wave path,which can improve imaging accuracy and avoid the inversion failure caused by periodic skipping.To verify the applicability and effectiveness of the proposed method,a homogeneous model is used to compare the wave propagation characteristics of the new equation,acoustic wave equations,and elastic wave equations un-der the excitation of different sources,and the verification test of radiation pattern is also carried out.Finally,the effectiveness of the inversion method in recovering the background velocity model is verified using a Sigsbee 2A resampling model.关键词
反射波旅行时反演/纵波资料/弹性参数/声-弹方程耦合模式/速度建模Key words
reflection travel-time inversion/P-wave data/elastic parameters/acoustic-elastic equation coupled mode/velocity modeling分类
地质学引用本文复制引用
李青阳,李斐,曾亚丽,段沛然,任雄风,葛炳妤..基于纵波资料弹性参数反射波旅行时反演[J].石油地球物理勘探,2025,60(2):401-408,8.基金项目
本项研究受中石油长庆分公司科技专项"鄂尔多斯盆地页岩油勘探开发理论与关键技术研究"(2021DJ1806)与"陆相页岩油地球物理建模关键技术研究"(2023ZZ15YJ02)联合资助. （2021DJ1806）
