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TitreSolid bitumen in the Montney Formation: diagnostic petrographic characteristics and significance for hydrocarbon migration
AuteurWood, J M; Sanei, H; Ardakani, O H; Curtis, M E; Akai, T; Currie, C
SourceInternational Journal of Coal Geology vol. 198, 2018 p. 48-62, https://doi.org/10.1016/j.coal.2018.09.004
Année2018
Séries alt.Ressources naturelles Canada, Contribution externe 20180053
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.coal.2018.09.004
Mediapapier; en ligne; numérique
Formatspdf (Adobe® Reader®); html; mp4 (Windows Media Players)
Sujetsressources pétrolières; capacité de production d'hydrocarbures; migration des hydrocarbures; pétrole; gaz; fluage; structure des pores; analyses pétrographiques; géologie du substratum rocheux; lithologie; roches sédimentaires; schistes; silstones; caractéristiques structurales; bitume; pyrobitume; kérogène; microscopie des lames minces; analyses au microscope électronique à balayage; échantillons carrotés; puits; structures sédimentaires; diagenèse; ichnologie; milieu sédimentaire; roches reservoirs; Formation de Montney ; Méthodologie; combustibles fossiles; géochimie; sédimentologie; Phanérozoïque; Mésozoïque; Trias
Illustrationstables; photomicrographs
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Diffusé2018 09 05
Résumé(disponible en anglais seulement)
The petrographic study of organic matter (OM) in fine-grained, shale and tight rocks can be complicated by ambiguities in distinguishing primary kerogen (deposited OM) from secondary solid bitumen (migrated and solidified petroleum). In this study, complementary thin-section, field emission scanning electron microscopy (FESEM) and organic petrology methods are used to examine core samples acquired from petroleum wells drilled into the Triassic Montney Formation in western Canada. The results show that OM in the medium- to coarse-grained siltstones of the Montney tight-gas and hydrocarbon liquids fairway is composed almost entirely of pore-filling solid bitumen/pyrobitumen. Here, we document a range of petrographic characteristics that are diagnostic of the solid bitumen and its origin as migrated liquid petroleum. These solid bitumen characteristics include (1) void-filling habit, (2) enclosure of earlier authigenic minerals, (3) margins with smoothly curved meniscate form, (4) internal flow structure, (5) entrained and aligned clay minerals, (6) isopachous rims along inorganic pore walls, (7) globular/granular aggregates and (8) fracture-filling habit. The petrographic results also show that the migration and flow of original oil through the thick Montney Formation (up to 340 m) was controlled at the micro-scale by sedimentary, ichnological, diagenetic and structural features. These features combined to form highly complex pathways and baffles for hydrocarbon migration. Petrographic recognition of OM as secondary migrated solid bitumen rather than primary deposited kerogen has vital significance for assessing unconventional shale and tight hydrocarbon plays including OM typing from Rock-Eval pyrolysis, interpreting depositional facies and environments, and evaluating reservoir quality.
Résumé(Résumé en langage clair et simple, non publié)
Dans cette étude, nous utilisons des méthodes complémentaires de microscopie électronique à balayage à émission de champ (FESEM) et de pétrologie organique pour examiner des échantillons de carottes prélevés dans des puits pétroliers forés dans la Formation Triasique Montney dans l'Ouest canadien afin de fournir des caractéristiques pétrographiques diagnostiques de bitume solide. dans la formation de Montney.
GEOSCAN ID308248