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TitleDolomite fluorescence Red/Green quotient: A potential new thermal maturity indicator
AuthorHaeri Ardakani, O; Sanei, H
SourceInternational Journal of Coal Geology vol. 137, 2015 p. 165-171,
Alt SeriesEarth Sciences Sector, Contribution Series 20140374
Mediapaper; digital; on-line
File formatpdf
NTS21L/03; 21L/04; 21L/05; 21L/06; 21L/11; 21L/12; 21L/13; 21L/14; 83M/03; 83M/04; 83M/05; 83M/06; 83M/11; 83M/12; 83M/13; 83M/14; 93P/01; 93P/02; 93P/07; 93P/08; 93P/09; 93P/10; 93P/15; 93P/16
Lat/Long WENS -72.0000 -71.0000 47.0000 46.0000
Lat/Long WENS-121.0000 -119.0000 56.0000 55.0000
Subjectsdolomites; thermal maturation; petroleum exploration; shales; siltstones; vitrinite; vitrinite reflectance; bitumen; Dolomite flourescence colour; Red/Green quotient; Utica shale; Montey Formation; Triassic
Illustrationsgraphs; tables; photomicrographs
ProgramShale Reservoir Characterization, Geoscience for New Energy Supply (GNES)
AbstractGeochemical and petrographic effects of burial temperature on sedimentary organic matter have long been recognized and used as various thermal maturity indicators (i.e., pyrolysis Tmax, conodont and spore coloration, vitrinite/bitumen/zooclast reflectance), and fluorescent spectrometry (i.e., ?max and Red/Green quotient). This study investigates variations in the fluorescence color spectra (in the visible light spectrum) of authigenic dolomite over a wide range of thermal maturities. Two sample sets of calcareous shales/siltstones from Eastern and Western Canada, with sparse dolomite crystals in the rock matrix were selected to examine the relationship between thermal maturity and fluorescent properties of dolomite. Results from a range of thermal maturities, from the oil window to the dry gas window, reveal a strong positive correlation between the Red/Green quotient (Q) of dolomite crystals and equivalent vitrinite reflectance (VRoeqv.) values. This can be optically described as the color shift in fluorescent properties of dolomite with increasing maturity. This strong positive correlation between Q and thermal maturity can potentially be used as an alternative thermal maturity indicator in calcareous shales with low organic content. Compilation of worldwide data is required to understand the relationship trend and conversion equations among dolomite Q and other established thermal maturity indicators.
Summary(Plain Language Summary, not published)
This contribution introced a new potential thermal maturity indicator for organic lean source rocks. It based on the fluorescence color variation of sparse dolomite crystals in shales.