Hydrogeochemical characteristics and water-rock interaction mechanism of coalbed-produced water in the Linfen mining area, eastern margin of Ordos Basin, China

Linfen mining area is one of the main coalbed methane industrial bases in eastern margin Ordos Basin, China. However, there are few studies on hydrogeochemical characteristics coalbed-produced water area. This article collected samples from 14 drainage wells and analyzed ionic concentrations, hydrogen oxygen isotopes, dissolved inorganic carbon isotopes ( δ 13 C DIC ) trace elements. The results showed that Nos. Five eight coal seams both Cl-Na type. total solids content was high, ranging 5011.45 mg/L to 23405.39 mg/L. Hydrogen isotope data indicated study recharged atmospheric precipitation. In addition, HCO 3 − produced No. seam Eight negatively correlated with DIC. value heavier than seam. These indicate microbial degradation occurred more strongly water-rock interaction found be dominated by cation exchange dissolution filtration through relationships between anion cation.