Fugitive gas migration and effluxes at oil and gas sites

Olenka N Forde1, Ulrich K. Mayer2, Aaron Graham Cahill1, Roger Daniel Beckie1 and Bernhard Mayer3, (1)University of British Columbia, Vancouver, BC, Canada, (2)University of British Columbia, Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, (3)University of Calgary, Department of Geoscience, Calgary, AB, Canada