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TitleOrganic matter variation within Upper and Lower Bakken shales of the Williston Basin by extracting kerogen pyrogram information
AuthorLiu, XORCID logo; Nordeng, S H; Chen, ZORCID logo; Jiang, CORCID logo; Mort, A
SourceInternational Journal of Coal Geology vol. 229, 103574, 2020 p. 1-10,
Alt SeriesNatural Resources Canada, Contribution Series 20190013
Mediapaper; on-line; digital
File formatpdf; html
NTS62E; 72G; 72H
AreaNorth Dakota; Canada; United States of America
Lat/Long WENS-108.0000 -102.0000 50.0000 46.0000
Subjectsfossil fuels; geochemistry; Science and Technology; Nature and Environment; source rocks; bedrock geology; lithology; sedimentary rocks; shales; petroleum resources; hydrocarbons; kerogen; thermal history; hydrocarbon generation; thermal maturation; burial history; pyrolysis; models; core samples; temperature; hydrogen index; statistical analyses; depositional environment; Bakken Formation; Bakken Shale; Williston Basin; Phanerozoic; Paleozoic; Carboniferous; Mississippian; Devonian
Illustrationslocation maps; profiles; schematic cross-sections; stratigraphic columns; plots; frequency distribution diagrams; tables; cross-sections; models; time series
ProgramGeoscience for New Energy Supply (GNES) Shale-hosted petroleum resource assessment
ProgramProgram of Energy Research and Development (PERD)
Released2020 08 03
AbstractActivation energy distribution from kerogen kinetics study contains some integral characteristics of the host source rock thermal history over geological time scales. Extracting relevant information from pyrogram is critical for reconstruction of source rock maturation and hydrocarbon generation histories. In this study, in order to improve understanding of the Bakken shale source rock, we present a new quantitative kinetic model by inversion of Rock-Eval pyrograms of the Bakken Formation in Williston Basin. A group of core samples from both Upper and Lower Members of the Bakken Formation were collected for estimating transformation ratio (TR) and pyrolysis analysis, and an inversion method with different kinetic statistic parameters was designed and conducted using the source rock Tmax-Hydrogen Index covariation combined with different burial histories. The analysis of Rock-Eval results on Williston Basin samples from both Canada and US sides demonstrate basin-wide organic matter characteristics of Upper and Lower Bakken and identify variation of hydrocarbon generation histories. The Upper and Lower Bakken shales have different kerogen type characteristics based on activation energy distributions derived from Tmax-HI pair relationship, which suggest variance of the preserved algal materials for Upper and Lower Bakken. The modeling results by the thermal history analysis with the Rock-Eval dataset indicate a higher remanent generable kerogen in Lower Bakken shale, and the thermal maturity results will be valuable for integrated assessment of the hydrocarbon systems of Williston Basin accurately.
Summary(Plain Language Summary, not published)
Kinetic model of petroleum source rock is important for better understanding oil and gas occurrence and their characteristics. We present a new kinetic model for studying the source rock generation kinetics using pyrolysis data to improve our understanding of the petroleum generation history. Core samples from the Upper and Lower members of Bakken Formation in the Williston Basin are collected and analyzed. The proposed method is then applied to the pyrolysis data for obtaining kinetic parameters, which are used subsequently to build hydrocarbon generation history models under different burial histories. Our results show that the source rocks vary in characteristics spatially and vertically. These variations could be related to changes in depositional environments as well as preservation conditions of the Bakken Formation. These findings provide useful insights for better understanding the Bakken petroleum system and its resource potential in the basin.

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