Simulation of thermal breakthrough factors affecting carbonate geothermalto-well systems  

作　　者：Jia-xing Sun Gao-fan Yue Wei Zhang 

机构地区：[1]Langfang Comprehensive Survey Center of Natural Resources,China Geology Survey,Langfang 065000,Hebei Province,China [2]Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China [3]Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Shijiazhuang 050061,China [4]China University of Petroleum(Beijing),Beijing 102249,China

出　　处：《Journal of Groundwater Science and Engineering》2023年第4期379-390,共12页地下水科学与工程（英文版）

基　　金：supported by basic research project of Chinese Academy of Geological Sciences(No.YK202309).Special thanks are due to the reviewers and editors of this journal for their valuable suggestions and revisions of the manuscript.

摘　　要：Fractures play a pivotal role in carbonate thermal storage systems,serving as primary hydraulic conductivity channels that significantly influence thermal breakthrough times and heat extraction efficiency in geothermal-to-well systems.Their impact is critical for well placement and system life prediction.This paper focuses on a geothermal-to-well system within the carbonate reservoir of the Wumishan formation in the Rongcheng geothermal field,Xiong'an new area.It employs a combination of field tests and numerical simulations to determine the permeability of the reservoir and the evolution of fractures between wells.It also examines the influence of fracture width and roughness coefficient on the seepage and temperature fields under various injection scenarios and predicts thermal breakthrough times for production wells.The results show:Higher permeability is observed near well D16 compared to well D22 within the studied geothermal-to-well systems.Wider fractures between wells result in faster temperature decline in production wells.Lower injection flow rates lead to slower temperature reduction in injection wells.The use of roughness coefficients minimizes temperature variations in production wells.This study not only offers guidance for the development and utilization of the geothermal well system,but also contributes to a deeper understanding of the groundwater seepage and heat transfer process influenced by fractures.

关 键 词：Geothermal recharge Influencing factor Thermal breakthrough Seepage field Temperature field 

分 类 号：X14[环境科学与工程—环境科学] X171