煤田地质与勘探2024，Vol.52Issue(1)：93-103,11.DOI:10.12363/issn.1001-1986.23.07.0435
渤海湾盆地干热岩开发利用前景评估
Evaluating the exploitation and utilization prospects of hot dry rock in Bohai Bay Basin:Understanding based on numerical simulations for exploitation optimization
摘要
Abstract
The Bohai Bay Basin,characterized by high terrestrial heat flow,formation temperatures average of 175℃ at a depth of 5 000 m,and reservoirs with lithologies dominated by low-porosity and low-permeability metamorphic and igneous rocks,meets the requirements for the formation of hot dry rock(HDR)resources.Based on geothermal paramet-ers such as terrestrial heat flow,rock thermal conductivity,and heat production rate,this study established a three-dimen-sional HDR exploitation model with thermo-hydro coupling using the COMSOL software.Furthermore,this study ana-lyzed the effects of spacing between production and reinjection wells,reinjection and production rates,and well arrange-ment mode on the temperature evolution of the geothermal reservoir with exploitation time within 100 a.Accordingly,it selected the optimal scheme and estimated the potential HDR resources.Key findings are as follows:(1)Under certain reinjection and production rates,the rate of decline in production well water temperature over time is inversely propor-tional to injection and exploitation well spacing.(2)Under a certain well spacing,higher reinjection and production rates were associated with a quicker decrease in the water temperature of production wells and earlier thermal breakthroughs.(3)Regarding well arrangement mode,the HDR exploitation using two production wells and two reinjection wells yiel-ded more heat and higher efficiency than that using one production well and one reinjection well providing other condi-tions remained unchanged.Based on these results,the optimal HDR exploitation scheme was determined,consisting of an exploitation duration of 50 a,a well spacing of 400 m,reinjection and production rates of 90 m3/h,and well arrange-ment mode comprising two production wells and two reinjection wells.Using this scheme,the average water temperat-ure of the production wells will be 172℃ ,corresponding to total recoverable resources of 3.28×1019 J/a of the entire Bo-hai Bay Basin.For instance,in Renqiu City of Hebei Province,which falls within the delineated HDR favorable area,the heating demands of the entire city can be met using merely 157.75 km2 of HDR favorable area if the optimal HDR ex-ploitation scheme is adopted,as calculated based on a heat load index of residential buildings of 100 W/m2.Therefore,the exploitation and utilization of HDR resources in the study area can enhance the energy supply and guarantee capabil-ities of North China,contributing to the creation of a sustainable,green,and low-carbon energy system.关键词
干热岩/数值模拟/有利区圈定/开发方案优化/地热资源估算/渤海湾盆地Key words
hot dry rock(HDR)/numerical simulation/delineation of favorable area/exploitation scheme optimization/geothermal resource estimation/Bohai Bay Basin分类
天文与地球科学引用本文复制引用
江晓雪,朱传庆,丁蕊,谢芳,邱楠生..渤海湾盆地干热岩开发利用前景评估[J].煤田地质与勘探,2024,52(1):93-103,11.基金项目
国家自然科学基金面上项目(42172334) （42172334）
国家重点研发计划课题(2021YFA0716003) （2021YFA0716003）
