GEOSCAN Search Results: Fastlink


TitleGeochemical evidence for the internal migration of gas condensate in a major unconventional tight petroleum system
AuthorWood, J MORCID logo; Cesar, JORCID logo; Haeri Ardakani, OORCID logo; Rudra, A; Sanei, HORCID logo
SourceScientific Reports vol. 12, 7931, 2022 p. 1-15, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210704
PublisherNature Portfolio
Mediapaper; on-line; digital
File formatpdf; html
ProvinceAlberta; British 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; 93P/16; 94A/01
AreaFort St. John; Peace River; Grand Prairie
Lat/Long WENS-123.5000 -115.7500 59.0000 53.0000
Subjectsfossil fuels; geochemistry; Science and Technology; Nature and Environment; petroleum resources; hydrocarbons; gas; condensate; oil; hydrocarbon migration; fluid migration; pressure-temperature conditions; stable isotope studies; carbon isotopes; thermal maturation; geological history; burial history; crustal uplift; Lower Triassic; Montney Unconventional Petroleum System; Western Canada Sedimentary Basin; Phanerozoic; Mesozoic; Triassic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; geological time charts; plots
ProgramEnergy Geoscience Clean Energy Resources - Decreasing Environmental Risk
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)
The Lower Triassic Montney Formation is one of the major Natural Gas resources in Canada and the main potential target for carbon capture, utilization, and storage (CCUS). A better understanding of gas geochemistry and migration is critical for the success of any carbon storage program. The recognition of internal migration of gas-condensate sheds new light on the present-day distribution of hydrocarbon fluids within the Montney Formation and will assist future economic evaluation and exploitation of this world-class tight-petroleum resource and exploring CCUS potentials.

Date modified: