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TitleIntraformational migration of oil, gas-condensate and methane-rich gas in the Montney unconventional petroleum fairway
AuthorWood, J M; Euzen, T; Cesar, JORCID logo; Ardakani, O HORCID logo; Rudra, A; Sanei, HORCID logo
SourceGeoconvention 2023, abstracts; 2023 p. 1
Alt SeriesNatural Resources Canada, Contribution Series 20220522
MeetingGeoconvention 2023; Calgary; CA; May 15-17, 2023
Mediapaper; digital; on-line
File formatpdf
ProvinceBritish Columbia
NTS83C; 83E; 83F; 83G; 83J; 83K; 83L; 83M; 83N; 83O; 84B; 84C; 84D; 84E; 84F; 84G; 84L; 93I; 93O; 93P; 94A; 94B; 94G; 94H; 94I; 94J
Lat/Long WENS-123.5000 -115.7500 59.0000 53.0000
Subjectsfossil fuels; gas; petroleum occurrence; petroleum resources; methane; methane hydrate; hydrocarbons; Montney Formation; Western Canada Sedimentary Basin; Triassic
ProgramEnergy Geoscience Clean Energy Resources - Decreasing Environmental Risk
Released2023 05 15
AbstractThe Early Triassic Montney Formation of the Western Canada Sedimentary Basin had a complex history of petroleum charging from both external and internal source rocks. Recent geochemical studies across the Montney unconventional petroleum fairway recognize three main widespread episodes of internal (intraformational) migration of hydrocarbons (Figures 1, 2). The first episode was oil migration from distal Montney organic-rich source rocks during rapid burial (Euzen et al., 2018; Laycock et al., 2021; Watt et al., 2022). The second episode was gas-condensate migration during overpressuring close to the time of maximum burial (Wood et al., 2022). The final episode was methane-rich gas migration mainly during basin uplift and depressurization (Wood and Sanei, 2016, 2017; Sereda and Fur, 2017; Euzen et al., 2018, 2019, 2020, 2021; Wood et al., 2021; Chalmers et al., 2022). This presentation will review the geological and geochemical evidence for these three main episodes of intraformational hydrocarbon migration and discuss their temporal and spatial context within the Montney unconventional petroleum play.
Present-day oil, condensate, wet gas and dry gas reservoir-fluid windows in the Montney Formation generally align with depth and thermal maturity trends increasing to the southwest (Figure 1). However, the composition and distribution of Montney hydrocarbon fluids determined by thermal maturity were significantly modified by gas-condensate migration during deep burial (Kuppe et al., 2012; Wood et al., 2022) and later by migration of methane-rich gas (Wood and Sanei, 2016; Euzen et al., 2018; Wood et al., 2022) during uplift (Figures 1, 2). Regional mapping of Montney produced gas composition shows that the late-stage migration of methane-rich gas was enhanced along intricate, stratigraphically and structurally controlled pathways (red arrows, Figure 1). These dry gas migration pathways have direct economic impacts on well performance such as higher gas-oil ratios and lower hydrocarbon liquid contents than expected from routine thermal maturity proxies (Wood and Sanei, 2017; Wood et al., 2021).
Although our knowledge of intraformational hydrocarbon migration in the Montney unconventional petroleum play has advanced in recent years, there is still much to unravel. A key aspect that is currently not well understood is how the intimate co-existence of unconfined macropores and confined nanopores differentially controlled the migration and partitioning of hydrocarbon fluids (e.g., Alharthy et al., 2016). Improved understanding of micro-scale heterogeneity in hydrocarbon fluid distribution, particularly in the context of dynamic (non-equilibrium) PVT conditions through burial and uplift, will help to clarify the range and complexity of phase behaviour and production characteristics observed in this world-class unconventional petroleum play.
Summary(Plain Language Summary, not published)
This abstract for a conference presentation discusses the intraformational gas and condensate migration in the Montney Formation, the major natural gas resource in Canada that has a major implication in providing low-carbon energy resources.

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