Medium characteristics and hydrodynamic evolution law of high salinity mine water recharge in deep well

LIU Qi; WANG Weijun; LUO Bin; WANG Houzhu; ZHANG Zhijun

doi:10.3969/j.issn.1001-1986.2021.05.003

Volume 49 Issue 5

Nov. 2021

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COAL GEOLOGY & EXPLORATION > 2021 > 49(5): 29-35. > DOI: 10.3969/j.issn.1001-1986.2021.05.003

LIU Qi, WANG Weijun, LUO Bin, WANG Houzhu, ZHANG Zhijun. Medium characteristics and hydrodynamic evolution law of high salinity mine water recharge in deep well[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 29-35. DOI: 10.3969/j.issn.1001-1986.2021.05.003

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Medium characteristics and hydrodynamic evolution law of high salinity mine water recharge in deep well

1.
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
2.
China National Coal Group Corporation, Beijing 100120, China
3.
College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
4.
General Prospecting Institute, China National Administration of Coal Geology, Beijing 100039, China

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Received Date: January 28, 2021
Revised Date: August 09, 2021
Available Online: November 05, 2021
Published Date: October 24, 2021

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Abstract

The treatment and discharge of high salt mine water is one of the important factors affecting efficient coal mining in recent years. It is a worth exploring method to reduce the discharge of mine water by selecting the appropriate aquifer under the floor of the coal seam and transferring the high salt mine water to other places. Taking the X mine in the Ordos Basin as an example, the Baotashan sandstone and the deep Liujiagou Formation sandstone formation below the coal seam have transfer storage space. By mercury intrusion experiment and rock mechanics analysis, the two groups of formations were analyzed for medium characteristics; the water level natural recovery test, water pressure test and numerical simulation were used to study the hydrogeological parameters and hydrodynamic field. The research results show that Baotashan sandstone has a porosity of 6.57%-19.89%, which has great water storage potential but is too close to the mining coal seam. The transfer and storage of mine water may cause the threat of water inrush from the floor, so the current mining stage is not considered as a transfer storage layer. The permeability of Liujiagou Formation is 4.18%-7.49% and the permeability coefficient is 5.31×10^-6 m/d in the original state. After water injection and fracturing, the hydrogeological parameters of the Liujiagou Formation are 0.008 14-0.015 27 m/d. The permeability is greatly improved and can be maintained in a stable state. MODFLOW numerical simulation results show that the Liujiagou Formation has a good prospect in the long-term transfer and storage of mine water.
- mine water treatment,
- transfer mine water storage,
- media characteristics,
- hydraulic fracturing,
- Ordos Basin

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