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TitleStratigraphy, facies heterogeneities, and structure in the Montney Formation of northeastern British Columbia: relation to H2S distribution
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMackie, S J; Furlong, C M; Pedersen, P KORCID logo; Ardakani, O HORCID logo
SourceHydrogen sulfide (H2S) in the Montney Formation, Western Canada Sedimentary Basin (WCSB) - investigating a complex issue, workshop proceeding; by Ardakani, O HORCID logo (ed.); Pedersen, P KORCID logo (ed.); Geological Survey of Canada, Open File 8878, 2022 p. 53-59, Open Access logo Open Access
PublisherNatural Resources Canada
MeetingMontney H2S, Distribution and Origin Workshop; Calgary, AB; CA; February 9, 2022
Documentopen file
Mediadigital; on-line
RelatedThis publication is contained in Hydrogen sulfide (H2S) in the Montney Formation, Western Canada Sedimentary Basin (WCSB) - investigating a complex issue, workshop proceeding
File formatpdf
ProvinceBritish Columbia
NTS93P/16; 94A/01
Lat/Long WENS-120.0731 -120.0361 56.0725 55.8106
Subjectsfossil fuels; stratigraphy; structural geology; geochemistry; Science and Technology; Nature and Environment; Lower Triassic; sedimentary basins; petroleum resources; hydrocarbons; reservoirs; hydrogen sulphide; sulphur geochemistry; sulphates; facies; depositional history; burial history; anhydrite; flow structures; structural controls; fluid migration; bedrock geology; structural features; faults; carbonates; Montney Formation; Western Canada Sedimentary Basin; Charlie Lake Formation; Sunset Prairie Formation; Belloy Formation; Trends; Phanerozoic; Mesozoic; Triassic; Paleozoic; Permian
Illustrationslocation maps; geoscientific sketch maps; stratigraphic columns; stratigraphic cross-sections
ProgramEnergy Geoscience Clean Energy Resources - Decreasing Environmental Risk
Released2022 03 22
AbstractIn the last decade, the Lower Triassic Montney Formation of the Western Canada Sedimentary Basin (WCSB) has undergone significant development, providing a rich dataset to study structural, stratigraphic, and facies control on the variations in hydrogen sulphide (H2S) gas content. Splitting the siltstone dominated Montney into the three regional members (i.e., Lower Montney, Middle Montney, and Upper Montney) allows for detailed analysis on the enrichment of H2S within a local-scale study area in northeastern British Columbia (BC). Within this study area, Upper Montney H2S content increases within individual parasequences both up-dip and towards the east. In addition to potential up-dip migration, there may be greater sulphur-bearing components in the east, allowing for the sulphate reduction required to generate H2S. The overlying Middle Triassic thins eastward, providing proximity to the overlying anhydrite-rich beds of the Upper Triassic Charlie Lake Formation. Further, the overlying Middle Triassic Sunset Prairie Formation has an erosional edge that corresponds with eastern elevated H2S concentrations within the Upper Montney unit. Mapped structures are syn-depositional to the Middle Triassic, potentially providing conduits for early sulphate-rich fluid migration.
In the Middle and Lower Montney, elevated H2S generally occurs with proximity to the top of the Permian Belloy Formation. Within this study area, limited Lower Montney data is available and thus needs to be further corroborated with regional data. Both the Middle and Lower Montney display elevated H2S in trends that generally align with mapped faults. The faults may have acted as conduits for sulphate-rich fluids to migrate during early burial then migrate laterally through facies that may have been permeable during early burial, such as the carbonate-rich facies at the boundary between the Middle and Lower Montney. Further core and isotope analyses are required to fully understand this relationship.
Summary(Plain Language Summary, not published)
The origin and distribution of hydrogen sulfide (H2S) - a highly toxic and corrosive gas in conventional and unconventional resources of the Western Canada Sedimentary Basin - was the subject of many studies. The Early Triassic Montney Formation, one of the major North American unconventional gas resources, contains a significant amount of H2S in some areas. Several research teams in western Canada including the Geological Survey of Canada, the University of Calgary, and the University of British Columbia are investigating this complex issue. This workshop will provide a venue to discuss the latest scientific advancements on this topic in order to reach a better understanding of the distribution, origin, and mitigation strategies to overcome the associated economic and environmental issues. This open file report presents the proceedings of the online workshop 'Hydrogen sulfide (H2S) in the Montney Formation - investigating a complex issue' on February 9th, 2022 in Calgary Alberta, organized by the Canadian Society for Unconventional Resources (CSUR), Natural Resources Canada (NRCan), and University of Calgary.

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