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TitleHydrocarbon heterogeneity in a Montney core: Indication of drilling mud invasion and implications
AuthorJiang, CORCID logo; Ardakani, O HORCID logo; Sanei, HORCID logo; Wood, J M; Ghanizadeh, A; Clarkson, C R
SourceGeoConvention 2020, technical program; 2020 p. 1-3 Open Access logo Open Access
LinksOnline - En ligne
LinksPresentation - Présentation
Alt SeriesNatural Resources Canada, Contribution Series 20200447
MeetingGeoConvention 2020; Calgary; CA; September 21-23, 2020
DocumentWeb site
Mediaon-line; digital
File formatpdf
NTS83M; 83N; 84C; 84D; 84E
AreaPeace River
Lat/Long WENS-120.0000 -116.0000 57.5000 55.0000
Subjectsfossil fuels; geochemistry; Science and Technology; petroleum resources; hydrocarbons; organic geochemistry; hydrocarbon geochemistry; mud analyses; core analysis; hydrocarbon recovery; Montney Formation; Western Canada Sedimentary Basin
ProgramGeoscience for New Energy Supply (GNES) Canadian Energy Geoscience Innovation Cluster (CEGIC)
Released2020 09 26
Both bulk and molecular organic geochemical results on samples collected across three full-diameter cores from the Montney Formation in western Canadian sedimentary basin (WCSB) will be presented along with the hydrocarbon compositions of oil-based mud (OBM) samples collected during the drilling/coring of the wells. It is observed that OBM fluid invasion into the cores has resulted in contamination to the in-situ hydrocarbons originally present in the Montney Formation siltstone. Therefore, caution should be exercised when cores and cuttings samples from unconventional operations where use of OBM is common are to be used for hydrocarbon resources evaluation.
Summary(Plain Language Summary, not published)
Samples were collected across the diameter of a Montney core, and submitted to the lab for both bulk and molecular organic geochemical analyses. Results show that the amount and composition in different parts of the core are different, and this variation is caused by the contamination of oil used in the drilling mud. The core periphery is most contaminated, and the core center is least contaminated, thus the later being preferred over the former for geochemical evaluation and reservoir property tests.

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