GEOSCAN, résultats de la recherche


TitreOrganic petrology and thermal maturity of the Upper Ordovician Utica Shale, southern Quebec, Canada
AuteurHaeri Ardakani, O; Sanei, H S; Lavoie, D L
SourceThe 31st Annual Meeting of the Society for Organic Petrology, abstracts; 31, (2014), 2014 p. 1-2
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140104
ÉditeurThe Society for Organic Petrology
RéunionThe 31st Annual Meeting of the Society for Organic Petrology; Sydney; AU; Septembre 27 - Octobre 3, 2014
Mediapapier; en ligne; numérique
ProvinceQuébec; Ontario
SNRC21L; 31H; 31I
Lat/Long OENS -75.0000 -71.0000 46.7500 45.0000
Sujetshydrocarbures; capacité de production d'hydrocarbures; pétrole; régions pétrolières; exploration pétrolière; production pétrolière; présence de pétrole; ressources pétrolières; schistes bitumineux; pétrole; Argile d'Utica ; combustibles fossiles
Illustrationslocation maps; stratigraphic columns; photographs; plots
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
The present study focused on results of Rock-Eval analysis and organic petrology of Utica Shale cores from three wells in the southern Quebec (Fig. 1) at three different depths. Deep, intermediate and shallow Uica samples are from Talisman Saint-Edouard #1 (1997 to 2030 m), Junex Becancour #8 (700 to 752 m), and Junex Saint-Augustin #1 (351 to 514 m), respectively (Fig. 2).
The Upper Ordovician deep-marine, thick clastic succession of Utica Shale in southern Quebec overlies the predominantly shallow marine carbonate facies of the Cambrian-Ordovician St. Lawrence Platform (Fig. 1). The calcareous shales of the Utica Shale started to accumulate in a poorly oxygenated setting due to rapid increase of relative sea level rise. The Utica Shale is progressively thicker and deeper from NW to SE and is also remobilized and imbricated in thrust stacks beneath the St. Lawrence Platform (Fig. 2).
Samples have generally fair to good present median TOC content of ranging from 0.7 to 1.3%. The major organic matter constituents are matrix and migrated bitumen and pyrobitumen, chitinozoan, and graptolite that observed in intermediate Utica samples. The reflectance has been measured on matrix and solid bitumen and chitinozoan and graptolites. There is a strong agreement between bitumen reflectance and chitinozoan reflectance when they are converted to vitrinite reflectance using equations of Bertrand (1990) and Bertrand and Malo (2001), respectively.
The results show that the samples from the deeper parts of Utica Shale have equivalent VReqv of 2.12% and are in the dry gas zone while intermediate and shallow Utica samples have VReqv of 1.17% and 1.24%, at the end of oil window and the onset of et gas zone, respectively. This is in agreement with Rock-Eval data. VRo variations within the samples are caused by the nature of bitumen accumulation, matrix bitumen often shows lower maturity than the solid accumulated bitumen mostly due to surface quality of the measured area.
Random reflectance (VRo) measurement is shown to be a robust method for indicating the thermal maturity of samples with fine dispersed organic matter particles. Recent improvements in petrographic analysis allow accurate reflectance measurements on nano-scale spots, providing reliable information on thermal maturity.
Résumé(Résumé en langage clair et simple, non publié)
La présente étude a utilisé des carottes de trois puits dans le sud du Québec d'évaluer le niveau de maturité thermique des schistes d'Utica dans ce domaine.