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Methods to collect and analyze concentration-depth profiles of dissolved methane (C1), ethane (C2), and propane (C3) and their δ13C-values from directional drilling operations were evaluated. The δ13C values of C1-C3 gases from drill cuttings were consistent; however, deeper zones (>1200 m BG) were subject to greater variability. The variability for C1-C3 isotope values was attributed to the drilling...