Suitability evaluation for deep geological storage of mine water in the Ordos Basin

Authors

GULBOSTAN Tursun, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education, Xinjiang Institute of Engineering, Urumqi 830023, ChinaFollow
SUI Wanghua, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, ChinaFollow
AIBIBAI Mamat, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education, Xinjiang Institute of Engineering, Urumqi 830023, China
YANG Weifeng, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
CHEN Ge, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
GAO Liang, State Key Laboratory of Internet of Things for Smart City, University of Macao, Macao 999078, China

Abstract

Objective Given the issues of large mine water drainage in coal mines in China, as well as the corresponding high treatment cost and low utilization rate, thoroughly investigating efficient, environmentally friendly, economically feasible mine water treatment technologies is the key to the green transformation and the implementation of the sustainable development strategy in the coal industry. Deep geological storage of mine water represents an emerging technology for mine water treatment, enjoying the advantages of low cost and zero emissions. A key step in the application of this technology is to select suitable target reservoirs. Although relevant studies have proposed some criteria for the selection, there is an urgent need to develop methods for quantitative selection and evaluation. Methods Using a fuzzy comprehensive evaluation method and the analytic hierarchy process (AHP), this study proposed a suitability evaluation index system for the deep geological storage of mine water in the Ordos Basin and developed an evaluation method. Specifically, the evaluation indices were selected based on geologic stability, storage potential, and hydrogeological conditions. Then, based on the geological characteristics of the first-order tectonic units and deep strata in the basin, the scores and weights of individual evaluation indices of the tectonic units were determined. Finally, the comprehensive suitability score was calculated by combining the weights. Results and Conclusions The analysis and calculation of geological conditions reveal that the Ordos Basin has a potential geological storage capacity for liquids of 9.78×10¹² m³, suggesting great storage potential. The evaluation method and indices were proposed in combination with the geological characteristics of the Ordos Basin. The evaluation indices included three first-level and 12 second-level indices for the suitability evaluation of tectonic units, as well as four first-level and 19 second-level evaluation indices for the suitability evaluation of deep strata. The evaluation results reveal that the slope tectonic unit in northern Shaanxi is the most suitable area for deep mine water storage. Within this slope, the suitable deep reservoirs include the reservoir-cap rock assemblages of the Ermaying, Heshanggou, and Liujiagou formations, as well as the self-reservoir-self-caprock assemblage of the Majiagou Formation. The results of this study provide a basis for selecting the preferential areas for mine water storage for experiments.

Keywords

mine water, deep geological storage, storage potential, suitability evaluation, Ordos Basin

DOI

10.12363/issn.1001-1986.25.04.0261

Recommended Citation

GULBOSTAN Tursun, SUI Wanghua, AIBIBAI Mamat, et al. (2025) "Suitability evaluation for deep geological storage of mine water in the Ordos Basin," Coal Geology & Exploration: Vol. 53: Iss. 7, Article 20.
DOI: 10.12363/issn.1001-1986.25.04.0261
Available at: https://cge.researchcommons.org/journal/vol53/iss7/20

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