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TitleSolid bitumen as a determinant of reservoir quality in the Montney tight gas siltstone play
AuthorWood, J M; Sanei, H; Curtis, M E; Clarkson, C R
Source 2015, 2 pages
Alt SeriesEarth Sciences Sector, Contribution Series 20140391
MeetingCSPG Geoconvention 2015; Calgary; CA; May 4-8, 2015
Mediapaper; on-line; digital
File formatpdf
ProvinceAlberta; British Columbia
AreaMontney siltstone
Subjectseconomic geology; general geology; petrography; petroleum; pyrolysis; siltstones; pore size; reservoir pressures; reservoirs; solid bitumen; Triassic
Illustrationsphotomicrographs; graphs
ProgramShale Reservoir Characterization, Geoscience for New Energy Supply (GNES)
LinksOnline - En ligne
AbstractIn 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.
Summary(Plain Language Summary, not published)
This study examines the role of solid bitumen in the reservoir quality of the tight gas Montney play.