| Titre | Organic matter composition in the Alberta Montney Formation |
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| Auteur | Ardakani, O H ;
Cesar, J; Mackie, S J; Pedersen, P K; Reyes, J; Wood, J M |
| Source | Geoconvention 2021, abstracts; 2021 p. 1-3  Accès
ouvert |
| Liens | Online - En ligne
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| Image |  |
| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210158 |
| Éditeur | Geoconvention Partnership |
| Réunion | GeoConvention 2021; Septembre 13-15, 2021 |
| Document | site Web |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Alberta |
| SNRC | 84E/05; 84E/06; 84E/11; 84E/12; 84E/13; 84E/14 |
| Lat/Long OENS | -120.0000 -119.0000 58.0000 57.2500 |
| Sujets | ressources pétrolières; hydrocarbures; pétrographie; migration des hydrocarbures; échantillons carrotés; géochimie organique; géologie du substratum rocheux; lithologie; roches sédimentaires; mudstones;
roches mères; reservoirs; bassins sédimentaires; Formation de Montney ; Bassin sédimentaire de l'ouest canadien; Formation de Doig ; Formation de Fernie ; Membre de Gordondale ; combustibles fossiles; sédimentologie; géochimie; Nature et
environnement; Sciences et technologie; Phanérozoïque; Mésozoïque; Jurassique; Trias |
| Programme | Les géosciences pour les nouvelles sources d'énergie Caractérisation des réservoirs de schiste |
| Diffusé | 2021 07 06 |
| Résumé | (Sommaire disponible en anglais seulement)
Although the Montney Formation, part of the greater Triassic petroleum system in the Western Canadian Sedimentary Basin (WCSB), is one of the most
prolific hydrocarbon resources in North America, the organic matter composition and source of hydrocarbons in the Montney Formation is not well understood. Previous studies have considered the organic-rich middle Triassic Doig Formation and lower
Jurassic Gordondale member of Fernie Formation as major source rocks of the Triassic petroleum system (Allan and Creaney, 1991; Riediger et al., 1990; Ejezie, 2007). However, a regional organic petrography study in Alberta (Beaton et al., 2010; Reyes
et al., 2010), as well as more recent regional sedimentology, sequence stratigraphy, and organic geochemistry studies (Crombez et al., 2017; Euzen et al., 2018; Romero-Sarmiento et al., 2016; Becerra et al., 2020), have reported primary organic
matter in organic-rich intervals within the Montney Formation as possible internal source(s) of hydrocarbons. In contrast, other regional organic, transmitted light, and scanning electron microscopy (SEM) petrography studies of the Montney tight-gas
and hydrocarbon liquids fairway in British Columbia and adjacent Alberta suggest the organic matter is dominantly secondary and derived from liquid oil or bitumen that migrated and was subsequently thermally cracked (Sanei et al., 2015; Wood et al.,
2015, 2018a, b, 2020). In this study, we re-examined a sub-set of organic-rich interval samples from eleven cores across the Montney Formation in Alberta, part of the Beaton et al. (2010) data release, to investigate the origin and composition of the
organic matter in the Montney Formation using legacy Rock-Eval6(TM) as well as collected new programmed pyrolysis, organic geochemistry, and petrography and fluorescence microscopy data at the Geological Survey of Canada.
The results of this study
show that intermittent thin (2-10 cm thick) relatively organic-rich mudstone intervals (TOC less than or equal to 1 wt. %) in the Montney Formation in central and western Alberta contain primary organic matter that can be considered as a local source
of hydrocarbons in the Montney Formation in addition to other major adjacent organic-rich source rocks (i.e., Doig and Gordondale) within the Triassic petroleum system. These results are in agreement with Becerra et al. (2020) observation from
elsewhere in Alberta. However, the thin, relatively organic-rich mudstone intervals in the Alberta Montney cannot be considered as the only source of the vast amount of petroleum (solid bitumen, oil, gas) in the formation. This new evidence suggests
that the Montney Formation in Alberta can be considered as a hybrid unconventional hydrocarbon reservoir. A comprehensive regional organic petrography and geochemistry study throughout the basin will help to identify the major hydrocarbon families
and their sources in the WCSB Triassic petroleum system. |
| Sommaire | (Résumé en langage clair et simple, non publié)
La présentation de la conférence porte sur l'origine et la composition de la matière organique dans la formation de Montney, une ressource non
conventionnelle majeure dans l'ouest du Canada. L'origine de la matière organique dans la formation de Montney est depuis longtemps débattue. Ce travail tente d'apporter un éclairage pour mieux comprendre l'origine de la MO dans la formation de
Montney. |
| GEOSCAN ID | 328586 |
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