Hydrogeological characteristics and mechanism of a water-rich coal seam in the Jurassic coalfield, northern Shaanxi Prov
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ORIGINAL PAPER
Hydrogeological characteristics and mechanism of a water-rich coal seam in the Jurassic coalfield, northern Shaanxi Province, China Gang Fang 1,2,3
&
Yang Liu 2,3 & Xiangyang Liang 2,3 & Hao Huang 2,3
Received: 28 February 2020 / Accepted: 22 September 2020 # Saudi Society for Geosciences 2020
Abstract The Yuheng mining area of the Jurassic coalfield in northern Shaanxi Province is one of the most important coal-producing regions in China. The present study examines the mechanism of a water-rich coal seam in this area, namely, the No. 2 water-rich coal seam of the Balasu coal mine, by using the groundwater aquifers. From pumping and water chemistry tests, a macroscopic study of the aquifers, and a microcosmic analysis of the coal and rock, the hydrogeological conditions of the coal mine, the hydraulic relations between the various aquifers and the water-rich characteristics and the mechanism of the water-rich coal seam were analysed and summarised. According to the spatial distribution order, from shallow to deep, the salinity of the aquifers increases with an increase in the buried depth and the dissolved organic matter content decreases with aquifer depth. The direct water recharge source is the fractured sandstone aquifers of two Jurassic formations. Both aquifers are distributed in fluvial banded facies and their overall water content is relatively weak. The main mechanism for the formation of the water-rich coal seam in this area is that the No. 2 coal seam contains the original fissure and local special water-rich strata assemblage condition. This study is aimed at providing the basis for the hydrogeological characteristics of the Balasu coal mine, as well as a reference for similar mine conditions in the area. Keywords Balasu coal mine . Hydrogeological characteristics . Groundwater aquifers . Water-rich coal seam . Condition analysis . Mechanism study
Introduction The Jurassic coalfield in the northern Shaanxi Province of China includes several large mining areas such as Shenfu, Yushen, and Yuheng. The coal resources in these areas are rich and the coal quality is excellent, making it one of the main coal-producing areas in China (Yan and Hua 2011). In the Yuheng mining area (northern region), the average depth of Responsible Editor: Broder J. Merkel * Gang Fang [email protected] 1
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, China
2
Xi’an Research Institute, China Coal Technology and Engineering Group Corp, Xi’an, China
3
Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi’an, China
the coal seam is greater than 450 m. Severe mine water damage during the development of deep coal seams in this region has been reported by Li (2018) and Shang et al. (2017). They also reported a rarely discovered water-rich coal seam in the mining area. At present, there is no in-depth understanding of the formation mechanism, existing conditions, and development rules for this type of water damage (Jin 2017; Fan et al.
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