title: Composite geochemical database for coalbed methane produced water quality in the Rocky Mountain region.
abstract: Coalbed methane (CBM) or coalbed natural gas (CBNG) is an unconventional natural gas resource with large reserves in the United States (US) and worldwide. Production is limited by challenges in the management of large volumes of produced water. Due to salinity of CBM produced water, it is commonly reinjected into the subsurface for disposal. Utilization of this nontraditional water source is hindered by limited knowledge of water quality. A composite geochemical database was created with 3255 CBM wellhead entries, covering four basins in the Rocky Mountain region, and resulting in information on 64 parameters and constituents. Database water composition is dominated by sodium bicarbonate and sodium chloride type waters with total dissolved solids concentrations of 150 to 39,260 mg/L. Constituents commonly exceeding standards for drinking, livestock, and irrigation water applications were total dissolved solids (TDS), sodium adsorption ratio (SAR), temperature, iron, and fluoride. Chemical trends in the basins are linked to the type of coal deposits, the rank of the coal deposits, and the proximity of the well to fresh water recharge. These water composition trends based on basin geology, hydrogeology, and methane generation pathway are relevant to predicting water quality compositions for beneficial use applications in CBM-producing basins worldwide.
authors.affiliation: Advanced Water Technology Center (AQWATEC), Environmental Science & Engineering Division, Colorado School of Mines, Golden, Colorado 80401-1887, USA.
authors.forename: Katharine G
authors.initials: KG
authors.lastname: Dahm
authors.forename: Katie L
authors.initials: KL
authors.lastname: Guerra
authors.forename: Pei
authors.initials: P
authors.lastname: Xu
authors.forename: Jörg E
authors.initials: JE
authors.lastname: Drewes
mesh_terms: D000383:Agriculture; D003031:Coal; D016208:Databases, Factual; D060766:Drinking Water / Q000592:standards; D055593:Geological Phenomena; D007220:Industrial Waste; D008697:Methane; D059206:Natural Gas; D015205:Northwestern United States; D059027:Recycling; D015206:Southwestern United States; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000592:standards
chemical_list: D003031:Coal; D060766:Drinking Water; D007220:Industrial Waste; D059206:Natural Gas; D014874:Water Pollutants, Chemical; D008697:Methane