海洋地质与第四纪地质2024，Vol.44Issue(6)：60-70,11.DOI:10.16562/j.cnki.0256-1492.2024100802
天然气水合物地层剪切模量参数岩石物理计算及叠前反演
Rock physics calculation and pre-stack inversion of shear modulus parameters for natural gas hydrate-bearing sediments
摘要
Abstract
To accurately estimate gas hydrate content using seismic data,two key problems are needed to be solved:the first is to establish the quantitative relationship between the elastic parameters and physical parameters of hydrate-bearing sediments;the second is to establish the quantitative relationship between seismic pre-stack data and the elastic parameters.In view of the above problems,we combined the microscopic structure of gas hydrate-bearing sediments in Shenhu area on the focus of its characteristics of non-zero shear modulus,used the uncoupled differential effective medium(DEM)theory and patchy saturation theory to carry out the modeling of rock physics,and established the nonlinear relationship between gas hydrate saturation and elastic parameters.Through the analysis of sensitivity and crossplots of elastic parameters,we determined that the shear modulus is a good indicator to the hydrate content.Using the pre-stack Bayesian seismic inversion method,the shear modulus of hydrate-bearing sediments were extracted from the pre-stack seismic data,and the natural gas hydrate was effectively identified.The method in this study can provide a technical support for the identification and prediction of natural gas hydrate in sea areas.关键词
天然气水合物/岩石物理/剪切模量/地震反演Key words
gas hydrate/rock physics/shear modulus/seismic inversion分类
海洋科学引用本文复制引用
刘欣欣,王小杰,徐华宁,杨睿,刘鸿,陈江欣..天然气水合物地层剪切模量参数岩石物理计算及叠前反演[J].海洋地质与第四纪地质,2024,44(6):60-70,11.基金项目
国家自然科学基金"南海北部高富集天然气水合物储层特征与成藏控制机理研究"(U2244224),"西太平洋多圈层相互作用数据集成研究"(92358303) （U2244224）
山东省自然科学基金"天然气水合物频变衰减特征定量研究"(ZR2022MD029),"跨频带融合天然气水合物储层检测研究"(ZR2021MD118) （ZR2022MD029）
