天津市馆陶组热储集中开采区热储压力恢复原因分析  

Analysis of the reasons for the recovery of thermal reservoir pressure in the geothermal concentrated mining area of Tianjin Guantao Formation

作　　者：闫佳贤 张森 宗振海[1,3] 秦冬时 沈健 李虎[1,3] 殷肖肖 YAN Jiaxian;ZHANG Sen;ZONG Zhenhai;QIN Dongshi;SHEN Jian;LI Hu;YIN Xiaoxiao(Tianjin Geothermal Exploration and Development-Designing Institute,Tianjin 300000,China;Tianjin Geothermal Resources Development Co.,Ltd,Tianjin 300000,China;Observation and Research Station of Tianjin Medium-Low Temperature Geothermal,Tianjin 300000,China;Inner Mongolia Institute of Geological Survey and Research,Hohhot 010000,China)

机构地区：[1]天津地热勘查开发设计院,天津300000 [2]天津市地热资源开发有限公司,天津300000 [3]自然资源部天津中低温地热野外科学观测研究站,天津300000 [4]内蒙古自治区地质调查研究院,呼和浩特010000

出　　处：《华北地质》2024年第2期54-61,共8页North China Geology

基　　金：天津市规划和自然资源局项目“天津市地热资源开发利用动态监测项目”(HYGP-2020-C-026)。

摘　　要：地热是一种清洁能源,局部集中开采会形成压力降落漏斗。【研究目的】天津地区由于地热开发历史长,形成了大范围压力降落漏斗。2018年开采量逐步减少后,漏斗中心地带的水位开始迅速回升,热储压力开始恢复。但水位回升与开采量变化的相关关系、漏斗形态会发生哪些变化,目前研究较少,发展规律认识不够清晰。【研究方法】本文以天津地区新近系馆陶组热储层采灌条件下多年水位动态变化特征为例,通过采灌量和水位的相关关系分析,研究漏斗区水位动态演化规律,分析压力恢复的原因,并给出漏斗区地热可采量评价的合理建议。【研究结果】研究认为热储水量持续“入不敷出”是水位降落漏斗形成的根本原因,而群井抽水叠加效应导致热储压力的同步波动,消耗量骤减和漏斗的夷平作用使得漏斗中心区域水位回升。【结论】地热评价和管理应以漏斗区域内热储压力的实时动态为基准,合理控制消耗量,维持水量收支平衡,是地热资源持续利用的有效途径。This paper is the result of geothermal geology.Geothermal is a clean energy source,and local concentrated extraction of geothermal fluid will cause a pressure depression cones.[Objective]Due to the long history of geothermal development,multiple large-scale pressure depression cones have been formed in the Tianjin area.Since 2018,the water level in the center of the cones began to rise rapidly and the thermal reservoir pressure began to recover after the gradual reduction of mining output.However,there are few studies on the correlation between the water level rise and the change of mining output,and what changes will happen to the cone shape,and the understanding of the evolution law is not clear enough.[Methods]This article takes the dynamic changes of water level in the Guantao Formation of the Neogene in Tianjin as an example,analyzes the correlation between extraction and reinjection volume and water level,studies the dynamic evolution law of water level in the cone area,analyzes the cause for pressure recovery,and provides reasonable suggestions for evaluating geothermal recoverable amount in the depression cones.[Results]The study suggests that the continuous"insufficient inflow"of thermal reservoir water is the fundamental cause for the formation of a pressure depression cone,while the combined effect of group wells pumping leads to synchronous fluctuations in thermal reservoir pressure,a sharp decrease in consumption,and the flattening effect of the cone causing the water level in the central area of the cone to rise.[Conclusions]Geothermal evaluation and management should be based on the real-time dynamics of thermal reservoir pressure in the cone area,and reasonable control of consumption and maintenance of water balance are effective ways for the sustainable utilization of geothermal resources.

关 键 词：地热资源 水位降落漏斗 夷平作用 天津地区 

分 类 号：P314[天文地球—固体地球物理学]