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TitleStructure and stratigraphy of the Montney Formation and its relationship to the occurrence of H2S gas in NE British Columbia, Canada
AuthorMackie, S J; Kingston, AORCID logo; Pedersen, P K; Ardakani, O HORCID logo
SourceGeoConvention 2020 abstracts; 2020 p. 1 Open Access logo Open Access
LinksOnline - En ligne
Alt Series20210286
PublisherGeoConvention Partnership
MeetingGeoconvention 2020; September 21-23, 2020
DocumentWeb site
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia
NTS93I; 93O; 93P; 94A; 94B; 94G; 94H; 94I; 94J
AreaDawson Creek; Parkland
Lat/Long WENS-123.0000 -120.0000 58.2500 54.5000
Subjectsfossil fuels; structural geology; stratigraphy; environmental geology; geochemistry; sedimentology; Health and Safety; Science and Technology; Nature and Environment; Lower Triassic; hydrogen sulphide gas; petroleum resources; hydrocarbons; reservoir rocks; bedrock geology; lithology; sedimentary rocks; siltstones; structural features; fractures; isotopic studies; petrographic analyses; sulphates; fluid migration; stratigraphic analyses; structural analyses; Montney Formation; Western Canadian Sedimentary Basin; Phanerozoic; Mesozoic; Triassic
ProgramEnergy Geoscience Program Coordination
Released2020 01 01
Globally, harmful gases such as hydrogen sulfide (H2S) are an issue in many hydrocarbon reservoirs. The Lower Triassic Montney Formation in the Western Canadian Sedimentary Basin has a dense dataset of wireline logs, cores, isotopic analyses, and geophysical surveys making it a data-rich formation to study the occurrence of H2S gas. The large resource play within the siltstones of the Montney Formation has locally high H2S content which poses risks to the environment, worker safety, and economics. Understanding the geologic controls on the occurrence of high H2S zones is key in improving prediction and mitigation strategies. Currently, isotopic and petrographic analyses are being completed to determine the source of H2S in the Montney Formation. Alongside intraformational sulfate-rich fluids, another identified contributor to Montney H2S is underlying Devonian sourced sulfates, implying fluid migration through fracture systems (Liseroudi et al., in press). As we increase our understanding of the source(s) of H2S in the Montney it is becoming apparent that H2S is both structurally and stratigraphically controlled. A robust stratigraphic framework is therefore needed to constrain geochemical data and determine the relationship between H2S, structure, and stratigraphy.
The area of the Montney Formation under study is between Dawson and Parkland in North-East British Columbia (Canada). This location is stratigraphically interesting due to wells in close proximity having inverse stratigraphic occurrences of H2S. In the Dawson area, high H2S content occurs in the upper Montney while the Parkland area has high H2S in the Lower Montney. It appears high H2S occurrence in the study area is closely related to its complex structural framework. The stratigraphically controlled H2S occurrences are related to fracturing within the Montney Formation. Improved understanding of the relationship between H2S, structure, and stratigraphy, enhances the ability to predict high H2S zones in the Montney and potentially in other unconventional tight-gas reservoirs, where harmful gases are a concern. Accurate H2S distribution prediction improves economics, environmental protection, and worker safety.
Summary(Plain Language Summary, not published)
Hydrogen sulfide is a toxic and corrosive gas that affects many hydrocarbon reservoirs including the Montney Formation. Research indicates that there is strong structural controls on hydrogen sulfide distribution. This report highlights the stratigraphic controls on hydrogen sulfide distribution in the Dawson-Parkland region.

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