Field Exploration of Methane Seep Near Atqasuk

• Main Author: Katey Walter, Dennis Witmer, Gwen Holdmann
• Other Authors: United States. Department of Energy.
• Format: Report
• Language: English
• Published: University of Alaska 2008
• Subjects: Natural Gas; Origin; 02 Petroleum; Alaskan North Slope; Diesel Fuels; Energy Sources; Heating; 33 Advanced Propulsion Systems; Petroleum; Methane; Wetlands; Exploration; Climates; Mixtures; Sampling; 03 Natural Gas; Simulation; Prudhoe Bay; Flow Rate; Energy Accounting; Barrow; north slope; Alaska
• Online Access: https://doi.org/10.2172/963367; https://digital.library.unt.edu/ark:/67531/metadc930711/

Methane (CH{sub 4}) in natural gas is a major energy source in the U.S., and is used extensively on Alaska's North Slope, including the oilfields in Prudhoe Bay, the community of Barrow, and the National Petroleum Reserve, Alaska (NPRA). Smaller villages, however, are dependent on imported diesel fuel for both power and heating, resulting in some of the highest energy costs in the U.S. and crippling local economies. Numerous CH{sub 4} gas seeps have been observed on wetlands near Atqasuk, Alaska (in the NPRA), and initial measurements have indicated flow rates of 3,000-5,000 ft{sup 3} day{sup -1} (60-100 kg CH{sub 4} day{sup -1}). Gas samples collected in 1996 indicated biogenic origin, although more recent sampling indicated a mixture of biogenic and thermogenic gas. In this study, we (1) quantified the amount of CH{sub 4} generated by several seeps and evaluated their potential use as an unconventional gas source for the village of Atqasuk; (2) collected gas and analyzed its composition from multiple seeps several miles apart to see if the source is the same, or if gas is being generated locally from isolated biogenic sources; and (3) assessed the potential magnitude of natural CH{sub 4} gas seeps for future use in climate change modeling.