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UBC Theses and Dissertations

A field investigation on the transport and fate of fugitive gas from energy wells in glaciogenic sediments Chao, Jessie Tse-Hua


Recent petroleum resource development has generated concerns regarding the release of fugitive natural gas (comprised primarily of methane) from compromised wellbores into the shallow subsurface. Free-phase fugitive gas can move vertically to the ground surface, contributing to greenhouse gas emissions, or it can accumulate in confined spaces, creating explosive hazards. When free-phase gas dissolves into groundwater, it can be oxidized via microbially-mediated reactions that may deteriorate groundwater quality. To assess environmental risks posed by subsurface fugitive gas, it is critical to understand the transport and fate of fugitive gas in the shallow subsurface, particularly in petroleum resource development regions. The subject of this thesis is a controlled release field experiment to investigate the migration, dissolution behavior, and biogeochemical activity of fugitive gas as well as the hydrogeological controls on its migration in a shallow (

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