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TitleAssessment of shale gas potential from geochemical data in the Late Devonian shale succession, Liard Basin, Canada
AuthorHong, S K; Lee, K; Lee, H S; Choi, J; Mort, A
SourceJournal of Petroleum Science & Engineering vol. 199, 108273, 2021 p. 1-10,
Alt SeriesNatural Resources Canada, Contribution Series 20200666
PublisherElsevier B.V.
Mediapaper; on-line; digital
File formatpdf; html
ProvinceBritish Columbia
Lat/Long WENS-126.0000 -120.0000 61.0000 57.0000
SubjectsScience and Technology; geochemistry; shales; gas; Upper Devonian; organic carbon; Liard Basin; Paleozoic
Illustrationslocation maps; stratigraphic sections; cross-plots; diagrams
Released2020 01 07
AbstractThe shale gas potential of a Late Devonian shale sequence in the Liard Basin, an important unconventional gas reservoir, was assessed using the retained gas volume based on gas generation potential and hydrocarbon expulsion efficiency. Evaluation of gas generation potential in the Liard Basin depends on understanding the characteristics of the original organic matter. However, due to high thermal maturity, it is difficult to estimate the characteristics of the original organic matter from conventional methods. The type of original organic matter was inferred from inorganic geochemical proxies that reflect productivity (Ex-SiO2), terrestrial sediment input (Al2O3, Zr), and oxygen level in the bottom water (MoEF and UEF). By considering the present day TOC (TOCpd) and the type of original organic matter, the original hydrogen index (HIo) and original total organic carbon (TOCo) values were calculated to range from 200 to 700 mgHC/gTOC and from 0.3 to 29.0 wt%, respectively. The measured TOCpd values were similar to the TOCpd calculated from the 1-D petroleum system model using the original organic matter characteristics inferred in this study, which indicates that the TOCo values are reliable. Based on the evolution of the TOCo during its thermal history, the total gas generation potential in the Late Devonian shale sequence (550 ft) of the Liard Basin is estimated to be 1690 bcf/section. Considering the total gas in place (496 bcf/section), based on the estimated ultimate recovery, approximately 70% of the hydrocarbon might have been expelled. The retained gas volume fluctuates vertically in the Late Devonian shale sequence. The retained gas volume is higher in the 3946-3993 m (136 bcf/section) and 3993-4047 m (281 bcf/section) intervals than other intervals (less than 60 bcf/section), indicating that these intervals are the most prospective for shale gas exploration and development in the studied well.

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