GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreEffects of nanoporosity and surface imperfections on solid bitumen reflectance (BRo) measurements in unconventional reservoirs
AuteurSanei, H; Haeri-Ardakani, O; Wood, J M; Curtis, M E
SourceInternational Journal of Coal Geology vol. 138, 2015 p. 95-102, https://doi.org/10.1016/j.coal.2014.12.011
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140569
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.coal.2014.12.011
Mediapapier; en ligne; numérique
Formatspdf
ProvinceColombie-Britannique
SNRC83G/10; 93P/08; 93P/10
Lat/Long OENS-115.0000 -114.5000 49.7500 49.5000
Lat/Long OENS-120.5000 -120.0000 55.5000 55.2500
Lat/Long OENS-120.5000 -120.5000 55.7500 55.5000
Sujetsbitume; classification du bitume; porosité; maturation thermique; pétrole; production d'hydrocarbure; exploration pétrolière; ressources pétrolières; roches mères; géologie économique; géophysique; combustibles fossiles; Paléozoïque; Trias; Jurassique
Illustrationsphotomicrographs; graphs; tables
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
Bitumen reflectance (BRo) is an alternative maturity indicator to vitrinite reflectance (VRo) in Lower Paleozoic and marine rocks where few higher plant macerals can be found. In unconventional petroleum rocks, locally exuded and/or migrated oil are retained in the tight rocks and thermally and diagenetically consolidated into solid bitumen and pyrobitumen. Finding suitable bitumen macerals for BRo measurements pose a challenge in indicating the proper thermal maturity. This study reports the effects of surface imperfections caused by nanoporosity, surface granularities, and impurities on measuring BRo in core samples from the Jurassic Nordegg Shale (shale oil) and the Triassic Montney siltstone (tight gas) in the Western Canada Sedimentary Basin. The degree that bitumen's surface imperfections influence any given reflectance measurement was controlled by changing the probe size area. The larger the measuring probe, the higher the degree of surface imperfections is included in BRo readings. The effect is quantified in this paper, showing up to 27% diminishment of mean BRo values when the probe size increased from 0.31 to 5.85 ?m2. The mode in which bitumen accumulates within the rock has a strong influence on the degree of surface imperfections. Bitumen which is disseminated within clay matrix introduces a high degree of nanoporosity and mineral interference and hence will result in lowest BRo. In contrast, inclusions of high reflecting micrinite or diagenetic minerals such as pyrite result in higher BRo. These effects can vary at the microscopic scale leading to multiple populations of reflectance readings and difficult interpretations of thermal maturity.
Résumé(Résumé en langage clair et simple, non publié)
Cet article traite des effets de la nanoporosité et de la taille des sondes de mesure de la réflectance du bitume. Dans cette étude, une pratique exemplaire pour les mesures fiables de la réflectance du bitume est présentée.
GEOSCAN ID296234