| Titre | Estimation of original TOC using molybdenum bulk concentration: a case study from the Devonian Muskwa Shale in the Western Canada Sedimentary Basin |
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| Auteur | Hong, S K; Choi, J; Shinn, Y J; Lee, H S; Ardakani, O H |
| Source | Marine and Petroleum Geology vol. 128, 104991, 2021 p. 1-10, https://doi.org/10.1016/j.marpetgeo.2021.104991  Accès ouvert |
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| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200610 |
| Éditeur | Elsevier Ltd. |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.marpetgeo.2021.104991 |
| Media | papier |
| Formats | pdf; html |
| Province | Colombie-Britannique; Alberta; Saskatchewan; Territoires du Nord-Ouest |
| Lat/Long OENS | -125.0000 -105.0000 61.0000 49.0000 |
| Sujets | molybdène; Formation de Muskwa ; Sciences et technologie; minéralogie |
| Illustrations | cartes de localisation; diagrammes; tableaux; représentations graphiques combinées |
| Programme | Les géosciences pour les nouvelles sources d'énergie Caractérisation des réservoirs de schiste |
| Diffusé | 2021 02 25 |
| Résumé | (disponible en anglais seulement)
The estimation of the hydrocarbon generation potential of shales in unconventional and conventional resources depends on an accurate estimation of the original
total organic carbon (TOCo) content and original hydrogen index (HIo). TOCo is partially lost during thermal alteration whereas Mo/Al is hardly altered, suggesting that a linear correlation between them in immature shales can be used to estimate TOCo
in mature shales. However, this correlation method is not applicable when immature and mature shales have different kerogen types. Herein, a refined method to calculate TOCo for mature shales using a linear correlation between two major fractions of
organic matter (generative organic carbon (GOC), and non-generative organic carbon (NGOC)) and Mo/Al is proposed. If thermal maturity increases, only GOC that generates hydrocarbon is reduced without change in NGOC associated with kerogen type.
However, the linear correlation between TOCo and Mo/Al of immature shales can change the NGOC as well as GOC in the mature shales. To estimate TOCo of mature shales, original GOC (GOCo) in the mature shale is calculated using linear correlation
between the GOC and Mo/Al of the immature shale and subsequently, the calculated GOCo is combined with the NGOC unconverted from thermal alteration in the mature shales. We applied the refined method to the Devonian Muskwa Formation where mature and
immature shales have different kerogen types. The HIo was calculated from the ratio of GOCo to TOCo using the refined method. The calculated HIo values are similar to those roughly deduced from the cross-plot of Tmax vs. HI values. The result
indicates that the refined method is useful for accurate estimation of TOCo and GOCo in the shales. The refined method improves the estimation of original characteristics of organic matter in a shale gas reservoir where the original kerogen type
cannot be identified due to an increase in thermal maturity. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cette étude propose une méthode affinée pour calculer le COT dans les schistes matures en utilisant la corrélation linéaire entre deux fractions
majeures de la matière organique (c'est-à-dire le carbone organique générateur ; GOC, et le carbone organique non générateur ; NGOC) et le Mo/Al. Ces résultats indiquent que la méthode affinée est utile pour une estimation précise du TOCo et du GOCo
dans les schistes. La méthode peut améliorer l'estimation des caractéristiques originales de la matière organique dans les réservoirs de gaz de schiste où le type de kérogène original ne peut être identifié en raison de l'augmentation de la maturité
thermique. |
| GEOSCAN ID | 327873 |
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