雄安新区蓟县系雾迷山组地层水对白云岩溶蚀的模拟实验研究  

Experimental simulation of dissolution to dolomite in formation water of Jixianian Wumishan Formation in the Xiong'an New Area

作　　者：季少聪 张庆玉[1,2,3] 梁彬 李景瑞[1,2,3] 巴俊杰 聂国权[1,2,3] 董红琪 莫国宸 JI Shaocong;ZHANG Qingyu;LIANG Bin;LI Jingrui;BA Junjie;NIE Guoquan;DONG Hongqi;MO Guochen(Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR,Guilin,Guangxi 541004,China;International Research Center on Karst under the Auspices of UNESCO,National Center for International Research on Karst Dynamic System and Global Change,Guilin,Guangxi 541004,China;Pingguo Guangxi,Karst Ecosystem,National Observation and Research Station,Pingguo,Guangxi 531406,China)

机构地区：[1]中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室,广西桂林541004 [2]联合国教科文组织国际岩溶研究中心/岩溶动力系统与全球变化国际联合研究中心,广西桂林541004 [3]广西平果喀斯特生态系统国家野外科学观测研究站,广西平果531406

出　　处：《中国岩溶》2023年第4期809-818,共10页Carsologica Sinica

基　　金：广西重点研发计划项目(桂科AB23026062),中国地质调查项目(DD20221658),广西自然科学基金项目(2022GXNSFBA035454);岩溶所基本科研业务费(2021008)共同资助。

摘　　要：为了研究雄安新区雾迷山组地层水对白云岩的溶蚀作用,文章以雾迷山组白云岩为研究对象,以井下雾迷山组地层水为实验流体,开展高温高压条件下溶蚀模拟实验。实验结果表明:(1)样品在地层水中的溶蚀速率随温度增加总体呈下降趋势,具有快速下降—缓慢增加—快速下降的特征,在100~140℃范围内明显增加。样品在地层水中的溶蚀速率随压力增加明显增大。反应溶液的Ca^(2+)、Mg^(2+)浓度增加量随温度、压力变化特征与样品溶蚀速率随温度、压力变化特征一致;(2)孔隙、微裂隙欠发育的样品仅在样品表面发生溶蚀,使得样品表面变模糊。孔隙、微裂隙发育的样品,沿粒间、晶间孔隙及各类裂隙溶蚀、扩展,最终呈一定程度连通;(3)埋藏成岩环境下,在100~140℃范围存在一个保持较高溶蚀能力的温度窗口,这可能是研究区雾迷山组白云岩岩溶储层形成的有利温度区间。With the richest geothermal resources and the best development and utilization conditions in the central and eastern China,the Xiong'an New Area is the home of three large and medium-sized geothermal fields—Xiongxian,Rongcheng and Gaoyang.The Jixianian Wumishan Formation in the Xiong'an New Area has good reservoir endowment,large water yield and easy reinjection,which is the focus of geothermal resource exploration.At present,acid solutions,high-salinity water solutions or sea water which are prepared by researchers themselves are mainly used in simulation experiments,but less formation water is used as the experimental fluid.In this study,the dolomite of Wumishan Formation in the Xiong'an New Area is taken as the research object,and the formation water of Wumishan Formation in the underground is taken as the experimental fluid.The dissolution simulation experiment under high temperature and high pressure has been carried out to analyze the influence of temperature,pressure,lithology,structure and other factors on the dissolution of dolomite.This experiment adopts the simulation experimental device of dissolution kinetics under the conditions of high-temperature and high-pressure independently designed by Karst Geology Research Institute of the Chinese Academy of Geological Sciences.The formation water from the whole section of Wumishan Formation in the geothermal well of the Xiong'an New Area is taken as the reaction fluid.At the same time,considering the two factors of temperature and pressure,a total of 12 groups of experiments in the range of 40℃,10 MPa to 150℃,20 MPa have been carried out to simulate the dissolution of formation water of Wumishan Formation in the Xiong'an New Area on dolomite from the shallow burial to the deep burial.The experimental results show that dissolution rates of samples in the formation water decreased with the increase of temperature in general.The rates experienced a rapid decrease before a slow increase and then a rapid decrease again,with an obvious increase from 100℃t

关 键 词：雄安新区 雾迷山组 白云岩 地层水 高温高压实验 岩溶热储 

分 类 号：P642.25[天文地球—工程地质学]