Organic and isotope geochemistry analysis of petroleum condensates from the unconventional portion of the Montney Formation, Western Canada

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dc.contributor.authorCesar, Jaime
dc.contributor.authorBecker, Veith
dc.contributor.authorMayer, Bernhard
dc.date.accessioned2023-03-18T03:43:30Z
dc.date.available2023-03-18T03:43:30Z
dc.date.issued2020-08
dc.description.abstractThe Montney Formation is a rather complex petroleum reservoir because it contains in-situ and migrated hydrocarbons. Previous organic geochemistry studies reported for this play were based on biomarker ratios of petroleum fluids from the conventional part of this reservoir. Furthermore, there is no isotope study on liquid hydrocarbons from this formation reported to this date. Therefore, we determined the organic and isotope geochemistry of condensate petroleum from the unconventional portion of the Montney Formation to fill this knowledge gap. The condensates were found to be normal fluids of increasing thermal maturity with increasing depth and from the northeast to the southwest. Light hydrocarbon parameters such as paraffinicity (n-C7/methylcyclohexane) and aromaticity (toluene/n-C7) showed to be governed by thermal maturity according to the known maturity trends (increasing depth, and northeast to southwest). The molecular fingerprint of the condensates is to some extent bimodal (noticeable at n-C13) suggesting the possibility of two hydrocarbon charges in the reservoir. This is further evidenced by the stable carbon isotope profile of n-alkanes where light hydrocarbons (C8-C13) show a normal distribution (decreasing δ13C with carbon number) whereas heavier compounds (C19+) show a reverse trend (increasing δ13C with carbon number). We suggest that condensate petroleum produced in the study area corresponds to a mixture of hydrocarbons sourced by the Montney Formation plus alteration products from a pre-existing oil charge that migrated into Montney reservoirs before further burial and thermal maturation of this rock. Producing intervals were distinguished using the δ13C values of n-C11, n-C12, n-C22, and n-C23.en_US
dc.identifier.citationCesar, J., Becker, V., & Mayer, B. (2020). Organic and isotope geochemistry analysis of petroleum condensates from the unconventional portion of the Montney Formation, Western Canada. Fuel, 282, 118879. https://doi.org/10.1016/j.fuel.2020.118879en_US
dc.identifier.doihttps://doi.org/10.1016/j.fuel.2020.118879en_US
dc.identifier.urihttp://hdl.handle.net/1880/115938
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.publisher.departmentGeoscienceen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionacceptedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.policyhttps://www.elsevier.com/journals/fuel/0016-2361/open-access-optionsen_US
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.titleOrganic and isotope geochemistry analysis of petroleum condensates from the unconventional portion of the Montney Formation, Western Canadaen_US
dc.typejournal articleen_US
ucalgary.item.requestcopyfalseen_US
ucalgary.scholar.levelFacultyen_US
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