基于多场耦合数值模型的含水合物多孔介质声学特性:骨架颗粒排列和形状的影响  

Acoustic Properties of Porous Media Containing Hydrates Based on Multi-Field Coupled Numerical Model:Effects of Skeleton Particle Arrangement and Shape

作　　者：王云龙 邢兰昌[1,2] 魏伟 韩维峰[3] 朱作飞 苏丕波 WANG Yunlong;XING Lanchang;WEI Wei;HAN Weifeng;ZHU Zuofei;SU Pibo(College of Control Science and Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Shandong Provincial Engineering Research Center of Intelligent Sensing and Measurement and Control Technology,Qingdao 266580,Shandong,China;Department of Alternative Energy,PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065007,Hebei,China;Sanya Institute of South China Sea Geology,Guangzhou Marine Geological Survey,Sanya 572025,Hainan,China)

机构地区：[1]中国石油大学(华东)控制科学与工程学院,山东青岛266580 [2]智能感知与测控技术山东省工程研究中心,山东青岛266580 [3]中国石油勘探开发研究院新能源研究所,河北廊坊065007 [4]广州海洋地质调查局三亚南海地质研究所,海南三亚572025

出　　处：《新能源进展》2025年第1期7-16,共10页Advances in New and Renewable Energy

基　　金：山东省自然科学基金项目(ZR2024ME090);中石油“十四五”前瞻性基础性重大科技项目(2024DJ9601);三亚市“崖州湾”菁英人才科技专项项目(SCKJ-JYRC-2023-06);国家留学基金项目(202106455003)。

摘　　要：含水合物沉积物的声学特性受到水合物饱和度和微观赋存模式、骨架颗粒排列方式和形状等因素的影响,目前尚缺少针对骨架颗粒排列方式和颗粒形状影响规律和机理的研究。基于电-力-声多物理场耦合建模方法建立了不同骨架颗粒排列方式和不同颗粒形状条件下的含水合物沉积物有限元数值模型,探讨了不同水合物分布模式和饱和度条件下骨架颗粒排列方式和形状对沉积物声速和声衰减特性的影响规律和机理。研究结果表明:(1)水合物饱和度较低时,骨架颗粒菱形排列模型中石英砂颗粒体积占比高于立方排列模型,菱形排列模型的声速相对较高;随着水合物饱和度的升高,两类模型中水合物体积占比差异随之增大,水合物在立方排列模型中的体积占比相对较高,菱形排列模型的声速增长速率较低;(2)菱形排列模型的孔隙度小于立方排列模型,声波传播过程中能量衰减较低;(3)与圆球颗粒模型相比,椭球颗粒模型包含纵横比小且数量多的孔隙,导致椭球颗粒模型体积模量较小、声速较低;(4)椭球颗粒模型中孔隙的数量较多且尺寸较小,导致椭球颗粒模型中的波能损耗低于圆球颗粒模型。研究结果可为天然气水合物储层地震勘探和声波测井数据的解释提供理论支撑。The acoustic characteristics of hydrate-bearing sediments are influenced by factors such as hydrate saturation and micro-distribution modes,skeleton particle arrangement and shape,etc.Currently,there is a lack of research on the influence mechanisms of skeleton particle arrangement and particle shape.Finite-element numerical models of hydrate-bearing sediments were established based on the coupling modeling method of electrical-mechanical-acoustic multi-physics fields under conditions of different particle arrangement modes and particle shapes.The influences of skeleton particle arrangement modes and shapes on sediments'sound velocity and attenuation characteristics under different hydrate micro-distribution modes and saturation conditions were explored,and the mechanisms were discussed.It was demonstrated that:(1)when the hydrate saturation is low,the volumetric proportion of quartz sand particles in the diamond-arrangement model is higher than that in the cubic-arrangement model,thus the sound velocity of the diamond-arrangement model is higher;as the hydrate saturation increases,the difference in the volumetric proportion of hydrates between the two models increases and the volumetric proportion of hydrates in the cubic-arrangement model is higher,consequently the sound velocity growth rate in the diamond-arrangement model is lower;(2)the porosity of the diamond-arrangement model is smaller than that of the cubic-arrangement model,and the energy attenuation during the propagation of sound waves is lower;(3)compared with the spherical-particle model,the elliptical-particle model contains more pores with smaller aspect ratios,resulting in a smaller bulk modulus and lower sound velocity;(4)the ellipsoidal-particle model contains more and smaller pores,which results in lower wave-energy loss than that of the spherical particle model.This study provides theoretical support for the data interpretation of seismic exploration and sonic logging for natural gas hydrate reservoirs.

关 键 词：天然气水合物 多孔介质 数值模型 颗粒排列 颗粒形状 声学特性 

分 类 号：TK01[动力工程及工程热物理] P631[天文地球—地质矿产勘探] P315[天文地球—地质学]