| Title | Solid bitumen as a determinant of reservoir quality in the Montney tight gas siltstone play |
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| Author | Wood, J M; Sanei, H ; Curtis, M E; Clarkson, C R |
| Source | CSPG Geoconvention 2015, abstracts; 2015, 2 pages |
| Links | Online - En ligne
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| Image |  |
| Year | 2015 |
| Alt Series | Earth Sciences Sector, Contribution Series 20140391 |
| Publisher | GeoConvention |
| Meeting | CSPG Geoconvention 2015; Calgary; CA; May 4-8, 2015 |
| Document | book |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Alberta; British Columbia |
| Area | Montney siltstone |
| Subjects | economic geology; general geology; petrography; petroleum; pyrolysis; siltstones; pore size; reservoir pressures; reservoirs; Triassic |
| Illustrations | photomicrographs; graphs |
| Program | Geoscience for New Energy Supply (GNES) Shale Reservoir Characterization |
| Released | 2015 01 01 |
| Abstract | 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. |
| Summary | (Plain Language Summary, not published)
This study examines the role of solid bitumen in the reservoir quality of the tight gas Montney play. |
| GEOSCAN ID | 295732 |
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