深层地热能开发及其对地热水流场的影响

宋前进; 王刚; 许一川; 程磊

doi:10.3969/j.issn.1001-1986.2021.02.023

深层地热能开发及其对地热水流场的影响

doi: 10.3969/j.issn.1001-1986.2021.02.023

宋前进¹,
王刚^2, ,,
许一川²,
程磊³

基金项目:

河南省地质勘查类项目(W2018JSFW0551)

详细信息

第一作者:
宋前进,1975年生,男,河南扶沟人,博士研究生,高级工程师,从事地质灾害防治理论与方法研究.E-mail:songqj001@163.com

通信作者:
王刚,1971年生,男,河南获嘉人,正高级工程师,从事水文地质工程地质相关工作.E-mail:617623706@qq.com

中图分类号: P314
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出版历程
- 收稿日期: 2020-08-28
- 发布日期: 2021-04-25

Development of deep geothermal energy and its influence on geothermal water flow field: Taking the development of deep geothermal energy in Lankao County for an example

摘要

摘要: 为了研究深层地热能开发对热储层流场造成的影响，选取兰考县深层地热能开发为研究对象，分析研究区新生代以来的地质结构和区域构造特征，调查地区地热开采情况及存在的问题。根据地热能类型分析了第四系Q、新近系明化镇组N₂、新近系馆陶组N₁等3个热储层特征，利用可控源音频大地电磁测深查明区内的断裂分布、热储层发育、隔水边界等条件，通过现场试验与测试手段查明不同部位热储层的参数指标，分区计算各层的地热资源量。根据开采方式、边界条件、水文地质参数建立数学模型，通过数值模拟预测出2023年Q热储层流场将恢复到原始流场模式，N₂热储层流场漏斗效应持续减弱，N₁热储层流场漏斗效应明显且分布不规则，为控制地热资源开发对环境造成的影响，提出封闭循环利用地热、同层加压回灌的开采方式及合理布局开采井、综合利用多层地热等措施，为本地及周边地区地热资源开发及环境保护提供参考。
- 深层地热能 /
- 热储层 /
- 流场 /
- 数值模拟 /
- 漏斗效应
Abstract: In order to study the influence of deep geothermal energy development on the flow field of thermal reservoir, deep geothermal energy development in Lankao County is selected as the research object. The geological structure and regional structure of the study area since Cenozoic are analyzed, and the of geothermal exploitation and existing problems in the area are investigated. According to the types of geothermal energy, the characteristics of the Quaternary(Q), Neogene Minghuazhen Formation(N₂) and Neogene Guantao Formation(N₁) are analyzed. The conditions of fault distribution, thermal reservoir development and water-resisting boundary in the area are found out by using controlled-source audio-frequency magnetotelluric sounding. The parameters of thermal reservoir in different positions are found by field test and measurement, the amount of geothermal resources in each layer by region are calculated. The mathematical model is established according to the mining mode, boundary conditions and hydrogeological parameters. By numerical simulation, it is predicted that the flow field of Q reservoir will revert to the original flow field model in 2023, the funnel effect of N₂ thermal reservoir flow field continues to weaken, the funnel effect of N₁ thermal reservoir flow field is obvious and its distribution is irregular. To control the influence of geothermal resource exploitation on environment, the methods of closed cycle geothermal utilization, pressure reinjection in the same layer, rational distribution of wells and comprehensive utilization of multi-layer geothermal are put forward, which provides a reference for the development of geothermal resources and environmental protection in local and surrounding areas.
- deep geothermal energy /
- thermal reservoir /
- flow field /
- numerical simulation /
- funnel effect

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