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TitleProduction characteristics and sweet-spots mapping of the Upper Devonian-Lower Mississippian Bakken Formation tight oil in southeastern Saskatchewan, Canada
AuthorChen, Z; Yang, C; Jiang, C; Kohlruss, D; Hu, K; Liu, X; Yurkowski, M
SourcePetroleum Exploration and Development vol. 45, issue 4, 2018 p. 662-672, https://doi.org/10.1016/S1876-3804(18)30070-3
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180185
PublisherElsevier B.V.
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceSaskatchewan
NTS62E; 7EH
AreaWeyburn
Lat/Long WENS-105.5000 -102.5000 51.0000 49.0000
Subjectsfossil fuels; mathematical and computational geology; structural geology; petroleum resources; petroleum exploration; exploration methods; resource estimation; reserve estimation; hydrocarbons; oil; statistical methods; modelling; wells; oil migration; source rocks; reservoir rocks; structural analyses; stress analyses; productivity; production; sedimentary basins; bedrock geology; lithology; sedimentary rocks; shales; structural features; faults; folds; anticlines; Bakken Formation; Williston Basin; Torquay-Rocanville Trend; geological mapping; geological controls; tight oil; rock-eval analyses; Phanerozoic; Paleozoic; Carboniferous; Mississippian; Devonian
Illustrationsgeoscientific sketch maps; cross-sections; time series; flow diagrams; plots; histograms; graphs; tables; rose diagrams
ProgramShale-hosted petroleum resource assesment, Geoscience for New Energy Supply (GNES)
AbstractA workflow that helps identify potential production sweet spots in the Middle Bakken tight oil play is proposed based on analysis of large amounts of production data. The proposed approach is a multivariate statistical model that extracts relevant information from a training dataset of production wells to facilitate geological similarity comparison between economic and sub-economic production wells. The model is applied to the Middle Bakken tight oil play in southeastern Saskatchewan. Data screening for diagnostic geological indicators for sweet spots reveals that several geological factors indicative for conventional oil reservoirs seem to work for the Middle Bakken tight oil play as well. These factors include: a) the NE Torqunay-Rocanville Trend serving as a preferred regional migration path for connecting mature source rock in southern Williston Basin and the Middle Bakken tight reservoir in southeastern Saskatchewan; b) the oils in the Bakken tight reservoirs along the U.S. and Canada border are more likely from local matured Bakken source rocks; c) subtle structural components enhancing the convergence of dispersed hydrocarbons over a large area; d) top seal and lateral barrier improving preservation, thus favouring oil productivity; e) orientation of maximum horizontal stress coincident with the direction of the variogram spatial continuity in ultimate recoverable reserves, so the direction of horizontal well has a significant impact on the oil productivity.
Summary(Plain Language Summary, not published)
Over the past 10 years, light oil has been produced from tight reservoir of the Middle Bakken in the Viewfield pool through application of multi-stage hydraulic fracturing coupled with horizontal wells. The National Energy Board and Saskatchewan Geological Survey have completed an assessment for the Middle Bakken tight reservoir, resulting in estimates of 223 x 106 m3 of marketable oil and 81.2 x 109 m3 of marketable natural gas. Delineating the locations of the economically viable resources in the Bakken tight reservoir is important for ensuring future production growth and economic prosperity in the region. We developed a method that helps identify sweet spots in a prospective area. The method is a statistical approach that takes information from producing area and then compares with target area for identifying potential sweet-spots. The method is applied to the Middle Bakken Unit A tight oil play in southeastern Saskatchewan, resulting in a resource map that delineates sweet-spots and provides a total recoverable resource potential estimate.
GEOSCAN ID310823