煤田地质与勘探2026，Vol.54Issue(1)：200-212,13.DOI:10.12363/issn.1001-1986.25.05.0376
深部咸水层碳封存协同地热能开采数值模拟研究
Numerical simulation of CO2 sequestration combined with enhanced geothermal energy extrac-tion in deep saline aquifers
摘要
Abstract
[Objectives and Methods]Deep saline aquifers represent ideal spaces for geologic CO2 sequestration while also featuring high geothermal gradients and abundant geothermal resources.The combination of CO2 sequestration and geothermal energy extraction holds great significance for enhancing the CO2 sequestration effect and achieving integ-rated resource development of deep saline aquifers.Therefore,this study proposed a development approach that com-bined CO2 sequestration with geothermal energy extraction in deep saline aquifers and established a thermo-hydro-chem-ical coupling numerical simulation model of the gas-water two-phase flow.Accordingly,it explored the optimal injec-tion mode,production and injection well patterns,and injection and production parameters[Results and Conclusions]Extracting formation water and geothermal energy during CO2 injection can effectively delay the rise in formation pres-sure while also providing more spaces for CO2 storage,with the CO2 storage capacity increasing by 16 500 t.After the depletion of movable water,further geothermal energy extraction with CO2 as the work fluid yielded an additional 6.60 MJ of heat while further increasing the CO2 storage capacity by 30 800 t.Geochemical reactions occurred during CO2 in-jection,increasing reservoir porosity and permeability by 0.002 2 and 0.43 ×10-3μm2,respectively.This creates favor-able conditions for continuous CO2 injection and geothermal energy extraction.Intermittent injection can delay the rise in the formation pressure to the greatest extent,identified as the optimal injection mode.It is recommended that produc-tion and injection wells should be arranged in the same aquifer and that more injection wells should be arranged in the structurally lower parts of reservoirs compared to production wells.The optimal injection and production parameters in-clude an injection rate of 10 000 m3/day,an injection-to-production rate ratio of 0.8,an injection cycle of three months,and a cyclic injection-to-production time ratio of 1.The proposed new development approach offers a novel philosophy for geologic CO2 sequestration in deep saline aquifers while also serving as a valuable reference for reaching the goals of carbon neutrality and peak carbon dioxide emissions and promoting efficient,collaborative resource development.关键词
深部咸水层/地热能/CO2地质封存/数值模拟/注入方式/注采井网/参数优选Key words
deep saline aquifer/geothermal energy/geologic CO2 sequestration/numerical simulation/injection mode/well pattern/selection of optimal parameters分类
能源科技引用本文复制引用
谢泽豪,张烈辉,赵玉龙,曹成,寇祖豪,张德平,李金龙..深部咸水层碳封存协同地热能开采数值模拟研究[J].煤田地质与勘探,2026,54(1):200-212,13.基金项目
国家自然科学基金区域创新发展联合基金重点支持项目(U23A2022) （U23A2022）
国家自然科学基金重点基金项目(52234003) （52234003）
中国石油—西南石油大学创新联合体项目(2020CX010000,2020CX020000) （2020CX010000,2020CX020000）
四川省科技计划项目(2022JDRC0098) （2022JDRC0098）
油气藏地质及开发工程全国重点实验室开放基金项目(PLN2024-22) （PLN2024-22）
