Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 516-525.doi: 10.13278/j.cnki.jjuese.20200179

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Statistical Evaluation of Impact of Coalbed Methane Exploitation on Groundwater Environment in Qinshui Basin

Luo Yishan1, Li Zhao2   

  1. 1. The 1st Geological Brigade of Jiangsu Geology&Exploration Bureau, Nanjing 210041, China;
    2. School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
  • Received:2020-08-04 Published:2021-04-06
  • Supported by:
    Supported by the National Natural Science Foundation of China(41730749) and the Project of the Energy Bureau of Qinshui County(SXYXTZB-2018-180)

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Abstract: Aiming at the impact of coalbed methane (CBM) exploitation on groundwater environment in Qinshui basin, a total of 129 water samples were collected and analyzed by statistical methods, and the relationship between groundwater and CBM co-produced water was systematically evaluated. The hydrochemistry characteristics were analyzed by Piper diagram. The main ions of groundwater are HCO3-, SO42-, Ca2+, and Mg2+, and those of the CBM co-produced water are HCO3-, Cl-, and Na+. The types of hydrochemical characteristics of groundwater and CBM co-produced water are quite different. The average concentration of F-in CBM co-produced water is higher than that in groundwater, so F-could be treated as a tracer of CBM co-produced water. The concentration of F-in groundwater did not increase in regional, however, the water samples from Shizhuang block South (1027-4, 1027-5) and Zhengzhuang block Southeast (1030-3) showed high F-. The relationship of F- from CBM co-produced water and groundwater was analyzed by cluster analysis. The cluster analysis results show that F- from CBM co-produced water in Shizhuang block South has a good correlation with Na+, HCO3-, and Fe3+, and the concentration of Na+, HCO3-, and Fe3+ from 1027-4 is higher than that in the surrounding area. F- from CBM co-produced water in Zhengzhuang block Southeast has a good correlation with NO3-, however, the concentration of NO3- from 1030-3 is not higher than the surrounding value. It is shown that CBM exploitation does pollute the groundwater in regional, while in the Shizhuang block, the shallow groundwater is polluted by CBM co-produced water.

Key words: coalbed methane, groundwater environment, statistics, cluster analysis

CLC Number: 

  • P641
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