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TitreDolomite fluorescence Red/Green quotient: A potential new thermal maturity indicator
AuteurHaeri Ardakani, O; Sanei, H
SourceInternational Journal of Coal Geology vol. 137, 2015 p. 165-171, https://doi.org/10.1016/j.coal.2014.12.005
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140374
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.coal.2014.12.005
Mediapapier; numérique; en ligne
Formatspdf
ProvinceQuébec
SNRC21L/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 OENS -72.0000 -71.0000 47.0000 46.0000
Lat/Long OENS-121.0000 -119.0000 56.0000 55.0000
Sujetsdolomites; maturation thermique; exploration pétrolière; schistes; silstones; vitrinite; réflectance de la vitrinite; bitume; Trias
Illustrationsgraphs; tables; photomicrographs
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
Geochemical 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.
Résumé(Résumé en langage clair et simple, non publié)
Dans ce document, nous présentons un nouvel indicateur potentiel de la maturité thermique des roches mères pauvres en matière organique. Cet indicateur est fondé sur la variation de couleur de la fluorescence des cristaux de dolomite disséminés dans des schistes.
GEOSCAN ID295680