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TitleSimple petrographic grain size analysis of siltstone reservoir rocks: An example from the Montney tight gas reservoir (Western Canada)
AuthorSanei, HORCID logo; Haeri Ardakani, OORCID logo; Ghanizadeh, A; Clarkson, C R; Wood, J M
SourceFuel vol. 166, 2016 p. 253-257,
Alt SeriesEarth Sciences Sector, Contribution Series 20140368
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
ProvinceAlberta; British Columbia
NTS83E; 83L; 83M; 84D; 84E; 93I; 93O; 93P; 94A; 94B; 94G; 94H; 94I; 94J
AreaGrande Prairie; Fort St. John; Fort Nelson
Lat/Long WENS-124.0000 -118.0000 59.0000 53.0000
Subjectsfossil fuels; igneous and metamorphic petrology; petrography; petrographic analyses; grain size analyses; grain size distribution; porosity; siltstones; sedimentary rocks; organic deposits; organic materials; Montney tight gas reservoir
Illustrationsplots; histograms; tables
ProgramGeoscience for New Energy Supply (GNES) Shale Reservoir Characterization
Released2015 11 02
AbstractThis paper presents a simple petrographic approach to measure grain size distributions of fine-grained tight reservoir rocks, simultaneous to other organic petrographic measurements. Application of reflected light microscopy on polished blocks is a routine methodology for organic petrographic analyses including maceral examination and measurement of vitrinite reflectance. While routine petrographic analysis is in progress, the presented method enables operators to provide simultaneous reporting of quantitative grain size distribution by random orientation measurement of grain diameters using a relatively quick and simple procedure. This method provides added value to the routine analytical information provided by organic petrography laboratories. Application of ultra violet (UV) incident light under both oil and water immersion objectives provides a far better visual distinction of grain boundaries compared to white incident light. The improved visual distinction is likely due to differences in the diffused UV energy between surface scattering of the crystalline grains and the subsurface scattering of the incident light from internal irregularities such as grain boundaries and cemented areas in the polycrystalline rock samples. As a result of this optical phenomenon, grain boundaries are highly visible as a light blue UV rim. We suggest a random orientation measurement of 50-250 grain diameters, depending on sample sorting in various parts of a polished block, to give a valid statistical dataset and a valid size distribution histogram.
Summary(Plain Language Summary, not published)
This paper presents a simple petrographic approach to reliably measure random grain size distributions of unconventional reservoir rocks, simultaneous to other organic petrographic measurements.

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