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TitreThe Silurian Qusaiba Hot Shales of Saudi Arabia: an integrated assessment of thermal maturity
AuteurInan, S; Goodarzi, F; Schimidt Mumm, A; Arouri, K; Qathami, S; Ardakani, O H; Inan, T; Tuwailib, A A
SourceInternational Journal of Coal Geology vol. 159, 2016 p. 107-119, https://doi.org/10.1016/j.coal.2016.04.004
Année2016
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150481
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.coal.2016.04.004
Mediapapier; en ligne; numérique
Formatspdf
Lat/Long OENS 38.0000 48.0000 31.0000 23.0000
Lat/Long OENS 36.0000 52.0000 32.5000 22.0000
Sujetsressources pétrolières; hydrocarbures; pétrole; gaz; roches sédimentaires; roches mères; schistes; maturation thermique; méthodes analytiques; pyrolyse; analyses des roches totales; analyses géochimiques; kérogène; fossiles; réflectance de la vitrinite; analyses pétrographiques; réflectance; analyses de fluorescence; analyses spectrographiques; chromatographie en phase gazeuse; analyse par spectromètre de masse; bitume; milieu sédimentaire; milieux marins; sédiments marins; historique de l'enfouissement; trous de mine; échantillons carrotés; analyse de carottes; bassins; modèles; pétrologie du sediment; Graptolites; géochimie; combustibles fossiles; Phanérozoïque; Paléozoïque; Silurien
Illustrationsstratigraphic columns; location maps; tables; diagrams; photomicrographs; bar graphs; graphs; spectra
ProgrammeCaractérisation des réservoirs de schiste, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
The Lower Silurian Qusaiba Hot Shales (QHS) are proven source rocks for oil within the Paleozoic, and possibly some of the Mesozoic, reservoirs in Saudi Arabia. Moreover, these shales have oil shale potential where they are immature and shallow enough for mining, as well as unconventional shale oil and shale gas potential, in areas where they are within oil-maturity and gas-maturity levels, respectively. The QHS were deposited in relatively shallow marine environments under anoxicwater conditions, resulting in accumulation of amorphous kerogen, organic-walled graptolites and acritarchs. Across the Arabian Basin, organic matter quality does not show much variation for the QHS, but the maturity varies greatly as a result of varying burial history. Thermal maturity assessment of shale source rocks that lack vitrinite, such as the Qusaiba Hot shales, continues to be challenging, especially where conflicting measurements are obtained from different sources. This paper presents an integrated assessment of QHS thermal maturity parameters, based on cores from13 carefully selected boreholes that - based on regional basin models - are believed to cover a wide maturity range (ca. 0.5 to 2.0% Ro). We conducted some analyses on kerogen (maceral petrography, graptolite reflectance, UVfluorescence, whole rock pyrolysis, Raman spectroscopy of graptolite) and other analyses on bitumen extracts (GC and GC-MS of saturate and aromatic fractions, and FTIR spectroscopy of the asphaltene fraction). We show that using many thermal maturity parameters reduces uncertainty significantly, and we therefore recommend that graptolite reflectance analyses should be conducted in support of other maturity indicators. Proper reflectivity measurements of the graptolites set the reference for comparison of other maturity parameters obtained from petrographic, geochemical, and spectroscopic techniques. Our work provides a template by which Qusaiba thermal maturity can be more accurately estimated when only a limited set of maturity parameters is available.
Résumé(Résumé en langage clair et simple, non publié)
Cette étude tente d'offrir un tableau intégré de la comparaison et de l'étalonnage d'un large éventail de paramètres de maturité thermique des schistes graptolitiques siluriens Qusaiba, riche en matière organique, de l'Arabie Saoudite. Les zones de pétrole et de gaz peuvent alors être définies avec plus de précision.
GEOSCAN ID297826