Forde, Olenka N.Cahill, Aaron G.Mayer, BernhardBeckie, Roger D.Mayer, K. Ulrich2022-09-022022-09-022022-01Forde, O. N., Cahill, A. G., Mayer, B., Beckie, R. D., & Mayer, K. U. (2022). Fugitive Gas Migration in the Vadose Zone at an Experimental Field Site in the Montney Shale Gas Region. Geophysical Research Letters, 49(15), e2022GL098762. https://doi.org/10.1029/2022GL0987621944-8007http://hdl.handle.net/1880/11515610.11575/PRISM/46080Forde, O. N., Cahill, A. G., Mayer, B., Beckie, R. D., & Mayer, K. U. (2022). Fugitive gas migration in the vadose zone at an experimental field site in the Montney shale gas region. Geophysical Research Letters, 49, e2022GL098762. https://doi.org/10.1029/2022GL098762Fugitive gas migration (GM) from compromised oil and gas wells remains a global concern. To understand environmental impacts from GM there is a need to characterize the transport and fate of fugitive gas in the vadose zone. We simulated subsurface wellbore leakage by injecting natural gas into thick unsaturated glacio-lacustrine deposits in a region of petroleum development in Western Canada. Methane and carbon dioxide effluxes were monitored and soil-gas samples were collected for molecular and stable carbon isotope analyses. A conceptual model was developed to demonstrate the physical and biogeochemical processes that control the spatial-temporal variability of GM. Methane oxidation partially attenuated natural gas; however, gas transport and fate were strongly influenced by variations in grain-size distribution and barometric pressure, resulting in episodic effluxes and lateral gas transport. To accurately detect, quantify and assess GM at oil and gas sites, adequate site characterization and continuous, spatially dense monitoring are necessary.engUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.Barometric‐pressure changesEffluxesFugitive gasGas migrationMethaneMethane oxidationOil and gas developmentSoil gasVadose zonejournal articleaward CEI-MET-196Bhttp://dx.doi.org/10.1029/2022GL098762