{"title":"Acidizing dissolution and permeability enhancement mechanisms under mine water reinjection: CO₂-water Co-storage propose","authors":"Xin Li, Ge Chen","doi":"10.1007/s12665-025-12588-4","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigates dissolution mechanisms and permeability enhancement in deep sandstone reservoirs during mine water reinjection, while exploring synergistic opportunities with CO₂-water co-storage technology. Through comprehensive laboratory experiments involving rock powder immersion and extended static acidization trials, we systematically evaluated acid neutralization capacity, mineral dissolution characteristics, and porosity-permeability evolution in target sandstone formations. Key findings demonstrate that the middle reservoir sections exhibit superior acid buffering capacity, with total dissolved solids (TDS) increasing by 2,197.04 mg/L in purified water systems - suggesting substantial permeability improvement potential. CT imaging combined with Kozeny-Carman modeling revealed porosity enhancements of 1.48 ~ 3.69 times and permeability increases of 4.77 ~ 70.24 times post-acidization, particularly in surface-connected pore networks. Numerical simulations predict hydraulic influence radius expansion of 1.8 ~ 4.2 times and cumulative water storage capacity escalation up to 60 times after sustained 700-day reinjection. As a novel contribution, we propose CO₂-water co-storage as an environmentally sustainable alternative to conventional acid reinjection. Experimental verification shows continuous CO₂ injection effectively acidifies mine water to pH 3.66, achieving hydrochloric acid-equivalent dissolution effects while eliminating corrosion risks and environmental hazards. This approach enables simultaneous reservoir permeability enhancement through in-situ mineral dissolution (calcite, dolomite, and feldspars) and dual carbon-water sequestration, reducing atmospheric CO₂ emissions. These insights advance sustainable reservoir management strategies that harmonize groundwater recharge efficiency with low-carbon objectives in mining regions, offering practical solutions for ecological preservation and resource utilization.</p></div>","PeriodicalId":542,"journal":{"name":"Environmental Earth Sciences","volume":"84 19","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Earth Sciences","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s12665-025-12588-4","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigates dissolution mechanisms and permeability enhancement in deep sandstone reservoirs during mine water reinjection, while exploring synergistic opportunities with CO₂-water co-storage technology. Through comprehensive laboratory experiments involving rock powder immersion and extended static acidization trials, we systematically evaluated acid neutralization capacity, mineral dissolution characteristics, and porosity-permeability evolution in target sandstone formations. Key findings demonstrate that the middle reservoir sections exhibit superior acid buffering capacity, with total dissolved solids (TDS) increasing by 2,197.04 mg/L in purified water systems - suggesting substantial permeability improvement potential. CT imaging combined with Kozeny-Carman modeling revealed porosity enhancements of 1.48 ~ 3.69 times and permeability increases of 4.77 ~ 70.24 times post-acidization, particularly in surface-connected pore networks. Numerical simulations predict hydraulic influence radius expansion of 1.8 ~ 4.2 times and cumulative water storage capacity escalation up to 60 times after sustained 700-day reinjection. As a novel contribution, we propose CO₂-water co-storage as an environmentally sustainable alternative to conventional acid reinjection. Experimental verification shows continuous CO₂ injection effectively acidifies mine water to pH 3.66, achieving hydrochloric acid-equivalent dissolution effects while eliminating corrosion risks and environmental hazards. This approach enables simultaneous reservoir permeability enhancement through in-situ mineral dissolution (calcite, dolomite, and feldspars) and dual carbon-water sequestration, reducing atmospheric CO₂ emissions. These insights advance sustainable reservoir management strategies that harmonize groundwater recharge efficiency with low-carbon objectives in mining regions, offering practical solutions for ecological preservation and resource utilization.
期刊介绍：
Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth:
Water and soil contamination caused by waste management and disposal practices
Environmental problems associated with transportation by land, air, or water
Geological processes that may impact biosystems or humans
Man-made or naturally occurring geological or hydrological hazards
Environmental problems associated with the recovery of materials from the earth
Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources
Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials
Management of environmental data and information in data banks and information systems
Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment
In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.
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