鄂尔多斯盆地矿井废水封存的储层地质模拟  

Reservoir Geological Simulation of Mine Wastewater Storage in Ordos Basin

作　　者：梁叶萍 郭婵妤 LIANG Yeping;GUO Chanyu(General Prospecting Institute,CNACG,Beijing 100039;Key Laboratory of Transparent Mine Geology and Digital Twin Technology,National Mine Safety Administration,Beijing 100039)

机构地区：[1]中国煤炭地质总局勘查研究总院,北京100039 [2]矿山透明地质与数字孪生技术国家矿山安监局重点实验室,北京100039

出　　处：《中国煤炭地质》2024年第12期77-82,共6页Coal Geology of China

基　　金：中国煤炭地质总局科技项目“蒙西陕北地区煤矿矿井水综合防治和资源化利用技术研究”。

摘　　要：煤炭矿井废水进行有效处理,有重要的经济和环境意义,深井回灌是一种快速和长期的矿井废水解决方案。为了研究废水在回灌区域垂直或横向迁移的不确定性,以变密度驱动、水岩化学反应和变参数协同物理化学反应为基础,采用数值模拟的方法,表征和再现煤矿废水在储层中的注入和扩散状态。模拟结果表明:注入阶段,主要驱动力是盐水与地层水之间的压差;注后阶段,密度差占主导;主要的地球化学反应过程是次生矿物硬石膏的沉淀反应,导致储层渗透性降低;其中,注入物的浓度主要通过影响水岩相互作用的程度来影响储层渗透性,导致渗透率降低0.17%~0.9%;注入速率通过影响压力驱动过程的变化来影响储层渗透性,导致渗透率降低0.58%~2.85%。Effective treatment of coal mine wastewater has significant economic and environmental implications,and deep well recharge is a fast and long-term solution for mine wastewater.In order to study the uncertainty of vertical or horizontal migration of wastewater in the recharge area,based on variable density driving,water-rock chemical reactions,and variable parameter synergistic physicochemical reactions,numerical simulation methods were used to characterize and reproduce the injection and diffusion states of coal mine wastewater in the reservoir.The simulation results indicate that during the injection stage,the main driving force is the pressure difference between saltwater and formation water.In the post injection stage,density difference dominates.The main geochemical reaction process is the precipitation reaction of secondary mineral anhydrite,which leads to a decrease in reservoir permeability.Among them,the concentration of the injected material mainly affects the permeability of the reservoir by influencing the degree of water-rock interaction,resulting in a decrease of 0.17%~0.9%in permeability.The injection rate affects the permeability of the reservoir by altering the pressure driven process,resulting in a decrease of 0.58%~2.85%in permeability.

关 键 词：矿山环境污染 矿井废水处理 深井回灌 数值模拟 鄂尔多斯 

分 类 号：X141[环境科学与工程—环境科学]