Characteristics and genetic mechanism of low sulfate in high-salt groundwater of Permian sandstone in Fudong mining area, Huainan

Authors

JIANG Chunlu, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; School of Resource and Environmental Engineering, Anhui University, Hefei 230601, ChinaFollow
HUANG Wendi, School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China
FU Xianjie, China Coal Xinji Energy Co., Ltd., Huainan 232001, China
ZHENG Liugen, School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China
CHENG Shigui, China Coal Xinji Energy Co., Ltd., Huainan 232001, China
SHAN Chonglei, China Coal Xinji Energy Co., Ltd., Huainan 232001, China

Abstract

Hydrogeochemistry research of groundwater in coal mining areas is of great significance to the prevention and control of mine water and the comprehensive utilization of water resources. In terms of the low surfate of Permian sandstone water in Fudong mining area, Anhui Huainan Coalfield, the hydrochemical characteristics, water-rock interaction and low sulfate genesis of sandstone water were studied through water sampling and test by multivariate statistical method, in combination with the hydrogeological condition analysis and the sulfur and oxygen isotope technology. The results show that the Permian sandstone water in the study area is weakly alkaline, with an average TDS of 1 842.35 mg/L, which belongs to brackish water. The main hydrochemical types are Cl-Na type, HCO₃-Na type and Cl·HCO₃-Na type. The average concentration of SO₄ ²⁻ is 37.48 mg/L, which is significantly lower than that Permian sandstone water in the eastern Panxie mining area of Huainan Coalfield and Huaibei Coalfield. The main water-rock interaction is evaporite (chloride and sulphate rock) and silicate minerals dissolution, with the alternating adsorption of cations. The Permian sandstone aquifer is a closed to semi-closed hydrogeological unit formed by the surrounding relative water-blocking boundary, which is cut by the boundary water-blocking fault. The aquifer is deeply buried, with weak water yield, poor hydrodynamic conditions and strong sulfate reduction environment, which is conducive to sulfate bacteria reduction. This results in obvious sulfate reduction, high δ³⁴S and low sulfate content in the sandstone water. The research results could provide a basis for identifying the water inrush source in mining areas with similar conditions.

Keywords

Fudong mining area of Huainan coalfield, coal-measure sandstone water, low sulfate characteristics, sulfur-oxygen isotope, sulfate reduction

DOI

10.12363/issn.1001-1986.23.04.0177

Recommended Citation

JIANG Chunlu, HUANG Wendi, FU Xianjie, et al. (2023) "Characteristics and genetic mechanism of low sulfate in high-salt groundwater of Permian sandstone in Fudong mining area, Huainan," Coal Geology & Exploration: Vol. 51: Iss. 11, Article 9.
DOI: 10.12363/issn.1001-1986.23.04.0177
Available at: https://cge.researchcommons.org/journal/vol51/iss11/9

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