| Titre | The Montney Formation - a low-permeability reservoir challenging organic geochemical perspectives for the transition towards a low-carbon economy |
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| Auteur | Cesar, J ;
Ardakani, O |
| Source | 2022 p. 1 |
| Image |  |
| Année | 2022 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210694 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Colombie-Britannique |
| Sujets | géochimie des hydrocarbures; Formation de Montney ; géochimie; Sciences et technologie; Nature et environnement |
| Programme | Géosciences de l'énergie La coordination du programme |
| Résumé | (disponible en anglais seulement)
In recent years, low-permeability hydrocarbon reservoirs have been found to operate under a peculiar natural gas geochemistry. Gases in molecular and isotope
equilibrium as well as more complex phenomena such as isotope reversals are some of the topics in discussion [1][2]. However, little is known about new geochemical approaches that are required (or not) to study molecular and isotope distributions in
liquid hydrocarbons from unconventional petroleum systems. The Lower Triassic Montney Formation, in the Western Canadian Sedimentary Basin (WCSB), is a difficult yet suitable example to explore some of these novel approaches because it presents a
large number of scenarios that challenge traditional geochemical perspectives. This is due to its hybrid character containing gas/condensate petroleum generated from thermal alteration of migrated oil, thermal degradation of original kerogen, and/or
mixtures of both [3]. Some of the organic geochemical features that we have identified in liquid hydrocarbons from the unconventional Montney Formation include the following: (i) different solid bitumen types exhibiting varying reflectance (typically
low values <0.4% may be attributed to phase fractionation and higher values >1% attributed to thermal alteration), (ii) significantly 13C depleted n-alkanes (~= -38 per mil) in migrated hydrocarbons carrying metals such as Zn and Ag, (iii) a series
of polycyclic aromatic hydrocarbons (PAH) relatively increasing with thermal alteration of oil or in some cases associated to inertinite macerals and potentially slow-heating paleofires, (iv) widely distributed arylisoprenoids including
isorenierratane. All of these confirm that generation mechanisms for hydrocarbons accumulated within Montney were multiple, and the key gap to address is the boundaries of these mechanisms through the low-permeability hydrocarbon plays. Our efforts
to optimize hydrocarbon extraction from the unconventional Montney play a critical role in the transition towards a low-carbon economy in the region. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Suite aux récentes avancées sur la géochimie du gaz naturel provenant de réservoirs non conventionnels, cette étude se concentre sur les
nouvelles perspectives concernant la géochimie des hydrocarbures liquides (qu'il s'agisse du pétrole liquide produit ou du bitume extrait des roches réservoirs/sources). Les résultats montrent que la génération d'hydrocarbures dans la formation non
conventionnelle de Montney, dans le bassin sédimentaire de l'Ouest canadien, s'est produite par le biais de multiples mécanismes qui impliquent une altération thermique, un fractionnement des phases et plusieurs étapes de migration des fluides (y
compris les hydrocarbures et l'eau). La connaissance des limites de ces mécanismes permettra d'optimiser l'extraction des ressources dans la zone d'hydrocarbures de classe mondiale de Montney. |
| GEOSCAN ID | 329693 |
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