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TitleAnalysis of microfractures in Lower Cretaceous and Upper Jurassic sandstones of the Scotian Basin, offshore Nova Scotia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPe-Piper, G; Sangster, C; Piper, D J WORCID logo
SourceGeological Survey of Canada, Open File 8715, 2020, 316 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceNova Scotia; Eastern offshore region
NTS10O; 11B
AreaScotian Basin; Scotian Shelf; Scotian Slope; Atlantic Ocean
Lat/Long WENS -60.0000 -58.0000 45.0000 43.0000
Subjectsfossil fuels; marine geology; sedimentology; mineralogy; tectonics; Nature and Environment; Science and Technology; Lower Cretaceous; Berriasian; Upper Jurassic; Tithonian; Kimmeridgian; microfractures; bedrock geology; lithology; sedimentary rocks; sandstones; structural features; faults; diagenesis; paragenesis; continental margins; continental shelf; continental slope; sedimentary basins; reservoir rocks; exploration wells; petroleum resources; porosity; permeability; hydrocarbon recovery; drilling techniques; thin section microscopy; electron microscope analyses; bedding planes; tectonic setting; salt tectonics; faulting; formation fluids; fluid flow; burial history; mineralogical analyses; Venture B-52 Well; Venture 1 Well; South Griffin J-13 Well; Peskowesk A-99 Well; Mic Mac Formation; Missisauga Formation; Classification; Phanerozoic; Mesozoic; Cretaceous; Jurassic
Illustrationslocation maps; stratigraphic columns; pie charts; charts; bar graphs; rose diagrams; plots; tables; photomicrographs
Released2020 05 05
AbstractMicrofractures have been investigated in potential reservoir sandstones in four wells from the eastern Scotian Basin. Samples were selected from within the overpressured zone in Venture B-52, just above overpressure in Venture 1, in an intensely silica-cemented interval in South Griffin J-13 and from a deeply buried sandstone lacking overpressure in a dry well, Peskowesk A-99. Backscattered electron (BSE) and cathodoluminescent (CL) images were acquired from polished thin sections. Microfractures (<100 micrometres wide) were classified as intragranular, intergranular, transgranular, intra-cement and hydro-fractures. The size and orientation of different microfractures were measured and their relationship to diagenetic paragenesis was assessed. Most microfractures are either bedding-parallel or at 45° to bedding. Generation 1 fractures probably result from eodiagenetic compaction; Generation 2 fractures are synchronous with mesodiagenesis; and Generation 3 fractures are open. This Open File presents the SEM data, measurements of size and orientation by fracture type, and a preliminary interpretation of the fracture data.
Summary(Plain Language Summary, not published)
Microfractures are an important component of reservoir quality in petroleum basins. They also provide information on the history of faulting and overpressure in the basin. Data used for microfracture analysis from four wells in the Scotian Basin are reported in this Open File.

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