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TitreSolid bitumen as a determinant of reservoir quality in the Montney tight gas siltstone play
AuteurWood, J M; Sanei, H; Curtis, M E; Clarkson, C R
Source 2015, 2 pages
LiensOnline - En ligne
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140391
ÉditeurGeoConvention
RéunionCSPG Geoconvention 2015; Calgary; CA; mai 4-8, 2015
Documentpublication en série
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceAlberta; Colombie-Britannique
Sujetspétrographie; pétrole; pyrolyse; silstones; taille des pores; pressions du reservoir; reservoirs; géologie économique; géologie générale; Trias
Illustrationsphotomicrographs; graphs
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
In this study of the Triassic Montney tight gas siltstone play in Alberta and British Columbia petrophysical measurements of drill-core samples (porosity, pore throat size and water saturation) are integrated with pyrolysis data, organic petrography observations and SEM imaging to show that reservoir quality in the gas window is strongly influenced by the pervasive presence of solid bitumen. The bitumen formed as a pore-filling liquid oil phase (Figures 1, 2) that was subsequently thermally degraded with further burial and increase in temperature. The amount of bitumen filling the paleopore network can be expressed as bitumen saturation and this attribute is found to be the dominant control on pore throat size distribution (Figure 3). Siltstones in economic portions of the Montney tight gas fairway commonly have porosity in the range of 3 to 7%. The results of this study show that reservoir quality in this economically key porosity range is influenced more strongly by bitumen saturation than by conventional determinants of porosity and permeability such as grain size, sorting, clay content and cementation. The concept of degraded bitumen as an important control of reservoir quality elucidated here for Montney siltstones likely has application to the technical and economic evaluation of other tight gas plays particularly those within indirect basin-centered gas accumulations.
Résumé(Résumé en langage clair et simple, non publié)
L¿étude porte sur le rôle du bitume solide dans la qualité des réservoirs peu perméables de la zone de prospection de Montney.
GEOSCAN ID295732