The hydrogeochemical characteristics of the mining area are of great significance for coalbed methane (CBM) production. Based on experimental test data for coalbed water and CBM well-produced water in the Suzhou mining area, as well as the actual production capacity of CBM wells, the effect of the hydrogeochemical characteristics on CBM well production capacity was analyzed in this article. The results indicated that the groundwater in the study area was in a closed hydrological environment and that the water quality type was mainly Na-K-HCO₃. When the groundwater from QD coal mine flowed through coal seam 6, the exchange intensity between Na⁺ and K⁺ in the water and Ca²⁺ and Mg²⁺in the formation's minerals was relatively high. The coefficients of variation of the ions in the QD coal seam water were within a moderate range, and the coefficients of variation of Ca²⁺ and Mg²⁺ were much higher than those of the other ions. Within the same coal mining area, the HCO₃^- concentration of the water produced from the CBM wells was positively correlated with the production of CBM. Among them, the HCO₃^- concentration of the water produced from well N-3 was the highest, and the gas production of this well was also the highest.

The water produced from coalbed methane (CBM) wells contains abundant geochemical information; therefore, analyzing the geochemical information available therein is of great significance for the efficient exploitation of CBM wells. Based on the geochemical characteristics of water from four CBM wells in eastern Yunnan, this paper analyzes the relationship between the geochemical characteristics of the produced water and gas production. The results indicate that the underground environment in which water is produced in the four CBM wells in the study area exists in a closed state. The water sourced from wells L-1 and L-2 is of the Na-Cl-HCO₃ type, whereas the water sourced from wells L-3 and L-4 is of the Na-HCO₃ type. Gas production is approximately positively correlated with high concentrations of HCO₃⁻, up to concentrations of 2800 mg/L, beyond which gas production decreases. Both D drift and ¹⁸O isotope drift in the produced water are beneficial for the production of CBM. The trace element content of the well water is influenced by the trace elements found in the coal seams and surrounding rocks, especially at peak trace element contents. The dissolved inorganic carbon isotope (¹³C_DIC) in the well water is affected by microbial methanogenesis and carbonate dissolution, and gas production is high when ¹³C_DIC is approximately −4‰.

The Suzhou mining area contains abundant coalbed methane resources. Analyzing the hydrochemical characteristics of formation and drainage water from coalbed methane wells is of considerable importance for the efficient extraction of coalbed methane. Using hydrochemical test data from formation water, produced water, and the main coal seam of four coalbed methane wells, this study systematically investigated the relationship between hydrogeochemical characteristics and drainage water from coalbed methane wells. The results indicate that the trace elements in the main coal seam were similar to those in the water samples from the coal-bearing Permian sandstone aquifer (CPSA), both of which showed elevated levels of Ba. The water samples from the fourth aquifer of the Cenozoic Era (Q4 aquifer) primarily underwent ion exchange between Na⁺ and K⁺ in the water and Ca²⁺ and Mg²⁺ in the formation minerals. The water samples from coalbed methane wells, CPSA, Carboniferous Taiyuan Formation limestone aquifer (CTFLA), and Ordovician limestone aquifer (OLA) primarily underwent ion exchange between Ca²⁺ and Mg²⁺ in the water and Na⁺ and K⁺ in the formation minerals.