裂隙-孔隙双重介质模型下的复杂裂隙岩体示踪传质特性  

Tracer Migration Characteristics of Complex Fractured Rock Mass under Fracture-porosity Dual Media Model

作　　者：宁佳祺 冯子军[1,2] 高祺 NING Jia-qi;FENG Zi-jun;GAO Qi(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Modified Mining Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024 [2]太原理工大学,原位改性采矿教育部重点实验室,太原030024

出　　处：《科学技术与工程》2025年第7期2904-2913,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52122405)。

摘　　要：为了深入研究地热储层中采灌井间的连通性及水力联系,使用COMSOL Multiphysic构造裂隙-孔隙双重介质数值模型,对深部裂隙岩体渗流及示踪运移进行模拟。分析了裂隙岩体中与主流线方向呈不同倾角的裂隙组的开度、岩体基质的扩散系数和渗透率对示踪剂突破曲线(breakthrough curve, BTC)的影响。结果表明:裂隙内水的对流是影响浓度运移的主要因素;随着裂隙开度增大,示踪剂运移的速率和峰值浓度增大,且示踪剂运移受裂隙开度的影响程度随裂隙组倾角增大而呈减小趋势;岩体基质扩散系数和渗透率对示踪剂的浓度时空分布影响显著;随着基质扩散系数增大,示踪剂迁移的延迟效应提高;随着基质渗透率增大,储层的压力和浓度分布各向异性降低,出口边界处的浓度分布更加均匀。In order to further study the connectivity and hydraulic connection between the injection and production wells in geothermal reservoir,a dual media model of fracture-porosity was constructed by using COMSOL Multiphysic.The effects of the aperture of the fissure group in fractured rock mass,the diffusion coefficient of the rock matrix,and the permeability on the tracer breakthrough curve(BTC)at different dip angles with the mainstream direction were analyzed.The results indicate that the convection of water in the fissure is the main factor influencing the concentration migration.With the increase of the fissure aperture,the migration rate and peak concentration of the tracer are enhanced,and the degree of the influence on the tracer migration by the fissure aperture decreases with the increase of the dip angle of the fissure group.The diffusion coefficient and permeability of the rock matrix have a significant impact on the temporal and spatial distribution of the tracer concentration.With the increase of the matrix diffusion coefficient,the delay effect of the tracer migration is elevated.With the increase of the matrix permeability,the anisotropy of the reservoir pressure and concentration distribution is reduced,and the concentration distribution at the outlet boundary becomes more uniform.

关 键 词：裂隙-孔隙双重介质模型 示踪运移 对流扩散 突破曲线 

分 类 号：TU452[建筑科学—岩土工程]