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TitleGeochemical evidence for the internal migration of gas condensate in a major unconventional tight petroleum system
AuthorCesar, JORCID logo; Ardakani, O HORCID logo
SourceScientific Reports vol. 12, 7931, 2022 p. 1-15, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20230059
PublisherSpringer Nature Limited
Mediapaper; digital; on-line
File formatpdf; html
ProvinceAlberta; British Columbia
NTS83; 84; 93; 94
Lat/Long WENS-123.7744 -116.7286 59.3675 52.8256
SubjectsScience and Technology; geochemistry; fossil fuels; petroleum; Internal migration
Illustrationstables; location maps; cross-plots; charts; diagrams
ProgramEnergy Geoscience Program Coordination
Released2022 05 13
AbstractUnconventional petroleum systems go through multiple episodes of internal hydrocarbon migration in response to evolving temperature and pressure conditions during burial and uplift. Migrated fluid signatures can be recognized using stable carbon isotope and PVT compositional data from produced samples representative of in-situ petroleum fluids. Such samples, however, are seldom collected due to operational complexity and high cost. Here, we use carbon isotope and PVT data from co-produced hydrocarbon gas and liquid to provide evidence for widespread migration of gas-condensate in the Montney unconventional petroleum system of western Canada. Extended C1-C33 isotopic profiles exhibit convex upward signatures with C4-C5 maxima at low molecular weight, and increasing or nearly uniform signatures at high molecular weight. Additionally, recombination PVT compositional data show C6-C15 condensate concentrations are higher than expected for unmodified oils. The combined convex upward and increasing or uniform isotopic signatures are interpreted as mixing profiles formed by the introduction of high-maturity gas-condensate (C1-C15) to shallower zones with in-situ hydrocarbon fluids of lower thermal maturity. The recognition of widespread gas-condensate migration adds to the complex history of internal hydrocarbon migration within the Montney tight petroleum system including previously identified migration episodes of early oil and late-stage methane-rich gas.
Summary(Plain Language Summary, not published)
This study identifies widespread migration of gas-condensate in the Montney unconventional petroleum system of western Canada, based on molecular and carbon isotope distributions. The findings thus affirm that not only methane, but also liquid hydrocarbon

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