Browsing by Author "Cheung, Terri Tze-Man"

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    Establishing High-Resolution Hydrogeological, Geochemical and Isotopic Baseline Conditions of the Fresh Water Zone at a Field Research Site Near Brooks, Alberta, Canada
    (2019-12-20) Cheung, Terri Tze-Man; Mayer, Bernhard; Lawton, Don C.; Cey, Edwin E.; Tutolo, Benjamin M.
    A high-resolution baseline characterization of dissolved gases in groundwater at the CMC field research site from 25.0 to 106.3 m depths was conducted. Data was collected from a continuously cored 106.3 m deep borehole, a 100.0 m deep Westbay® multi-level system and a 67.1 m deep domestic well. The multi-level well with 26 ports revealed variability and stratification in hydrogeology and hydrochemistry. Ports completed in coals had high flow rates and yielded sodium bicarbonate water type, water isotope compositions resembling local meteoric water, elevated methane and ethane concentrations, and biogenic d13C-CH4 values of <-82‰. Below the coals, ports were characterized by lower flow rates, higher d18O and d2H values of water and variable water types. Methane and ethane concentrations were lower compared to samples obtained from coals and d13C-CH4 values ranged between -75‰ and -60‰. The domestic well yielded groundwater with chemical and isotopic compositions resembling groundwater from only the high-flowing coal-containing aquifer portions.