| Title | Integrated petrophysical evaluation of the Lower Middle Bakken Member in the Viewfield Pool, southeastern Saskatchewan, Canada |
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| Author | Hu, K ; Chen, Z; Yang, C; Jiang, C; Liu, X |
| Source | Marine and Petroleum Geology vol. 122, 104601, 2020 p. 1-16, https://doi.org/10.1016/j.marpetgeo.2020.104601 |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200043 |
| Publisher | Elsevier |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Saskatchewan |
| NTS | 62E/05; 62E/06; 62E/07; 62E/10; 62E/11; 62E/12; 62E/13; 62E/14; 62E/15; 62E/16 |
| Area | Stoughton |
| Lat/Long WENS | -103.3439 -102.1567 50.0075 49.2964 |
| Subjects | fossil fuels; sedimentology; geophysics; Science and Technology; Nature and Environment; petroleum resources; hydrocarbon potential; hydrocarbons; oil; petrophysics; reservoir rocks; reservoir
parameters; models; core samples; core analysis; well logging; porosity; pore size; permeability; bedrock geology; lithology; sedimentary rocks; sandstones; siltstones; shales; Viewfield Pool; Lower Middle Bakken Member; Bakken Formation; Williston
Basin; Phanerozoic; Paleozoic; Carboniferous; Mississippian; Devonian |
| Illustrations | location maps; stratigraphic columns; geophysical logs; photographs; profiles; lithologic sections; plots; tables; histograms; geoscientific sketch maps |
| Program | Geoscience for New Energy Supply (GNES) Program Coordination |
| Released | 2020 08 11 |
| Abstract | The Viewfield Pool of the Lower Middle Bakken Member, the largest light oil pool in Saskatchewan, Canada has been described as an unconventional resource play. Reservoir evaluation in this pool has been
challenging because of low permeability, complex lithology and reservoir heterogeneity. To address the difficulties, this study employed an integrated approach to derive reservoir parameters and provided a detailed petrophysical characterization of
the Viewfield Middle Bakken play, which led to a division of Unit A, the Lower Middle Bakken Member into two subunits: A1 for the lower interval and A2 for the upper interval. Petrophysical models were developed based on thorough analyses of core
measurements, conventional well logs and available advanced nuclear magnetic resonance (NMR) well log data. The proposed models were applied to determine reservoir properties including shale content, porosity, permeability and water saturation for
the two subunits in 163 vertical wells among which three have NMR logs. The results reveal that subunits A1 and A2 differ significantly in petrophysical properties and reservoir quality. A2, the very fine-grained dolomitic sandstone subunit has
larger pore size, higher porosity and permeability, lower shale content and water saturation, and thus represents the preferred interval for oil production across the Viewfield Bakken Pool area and has greater resource potential than the siltstone
subunit A1. The mapped petrophysical properties show spatial trends that align well with the previously recognized regional geological features. Favourable potential high productivity zones can be outlined by the areas of intersection of all
essential reservoir parameters above defined threshold values. |
| Summary | (Plain Language Summary, not published)
The Viewfield Pool of the Lower Middle Bakken Member has been described as an unconventional resource play. Reservoir evaluation has always been
challenging because of low permeability, complex lithology and reservoir heterogeneity. This study is to propose an integrated approach for detailed petrophysical analysis and reservoir characterization for Unit A of the Middle Bakken Member. It
takes into consideration vertical reservoir heterogeneity and subdivides Unit A into two subunits based on correlation of lithology and well logs: A1 for the lower interval and A2 for the upper interval. Core analysis data, available advanced nuclear
magnetic resonance log data and conventional well logs are utilized to develop and validate petrophysical models for calculating reservoir parameters for A1 and A2. The results of this study reveal that subunits A1 and A2 are characterized by
significant different reservoir qualities. A2 sandstones exhibits lower shale content, larger pore size, higher porosity and notably higher permeability, and presents much greater reservoir potential than A1 siltstones, becoming the preferred oil
production interval in the study area. |
| GEOSCAN ID | 326058 |
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