GEOSCAN, résultats de la recherche


TitreThe Lower Paleozoic basins in eastern Canada: underexplored and underevaluated frontier basins
AuteurLavoie, D
SourceGAC-MAC-CSPG-CSSS Halifax 2005, building bridges - across science, through time, around the world: abstracts/AGC-AMC-SCGP-SCSS Halifax 2005, Jeter des ponts entre les disciplines scientifiques, les époques, et unifier le monde : recueil des résumés; AGC-AMC-SCGP-SCSS Reunion conjoint, Receuil des Résumés vol. 30, 2005 p. 110
Séries alt.Secteur des sciences de la Terre, Contribution externe 2004265
RéunionGAC-MAC-CSPG-CSSS Halifax 2005 - AGC-AMC-SCGP-SCSS Halifax 2005; Halifax NS/N-É; CA; mai 15-18, 2005
Documentpublication en série
ProvinceNouveau-Brunswick; Terre-Neuve-et-Labrador; Île-du-Prince-Édouard; Québec
SNRC2; 11L; 11M; 11N; 11O; 11P; 12; 21A; 21B; 21G; 21H; 21I; 21J; 22A; 21B; 21G; 21H; 21I; 21J; 21O; 21P
Lat/Long OENS -68.0000 -52.0000 52.0000 44.0000
Sujetspétrole; gaz; sédiments marins; orogénies; roches mères; roches reservoirs; pétrole; exploration pétrolière; production pétrolière; présence de pétrole; ressources pétrolières; charbon; calcaires; maturation thermique; altération hydrothermale; isotopes; sédimentologie; stratigraphie; combustibles fossiles; Cambrien; Dévonien
ProgrammeConsolidation du savoir géoscientifique du Canada
ProgrammeL'Initiative géoscientifique ciblée (IGC-2), 2003-2005
Résumé(disponible en anglais seulement)
The Cambrian to Middle Devonian successions at the continental margin of Laurentia consist of largely underexplored marine to continental sediments deposited during alternating passive margin and foreland basin episodes. Two significant orogenic pulses, the Middle- Upper Ordovician Taconian Orogeny and the Late Silurian-Middle Devonian Salinian-Acadian event controlled tectono-sedimentary patterns. The hydrocarbon prospective domains of the Lower Paleozoic continental margin consist of the St. Lawrence Platform, the Taconian Humber Zone and the Acadian Gaspé Belt. Good hydrocarbon source rocks are found in the Upper Ordovician foreland basin shales of the St. Lawrence Platform (TOC up to 14%), in the Middle Ordovician oceanic shales of the Dunnage Zone (TOC up to 10.7%) and in the Lower Ordovician passive margin shales of the Humber Zone (TOC up to 10.4%). Fair hydrocarbon source rocks are found in Lower Devonian foreland basin limestones and coals of the Gaspé Belt (TOC up to 2% and 14%, respectively). Primary and secondary potential clastic reservoirs are found in Cambrian-Ordovician, passive margin and foreland basin, coarse sandstone and conglomerate slope facies and in Silurian-Devonian, nearshore sandstones. The potential for secondary carbonate reservoirs is recognized in hydrothermally-altered carbonates (HTD) of: 1) Lower to Upper Ordovician, passive margin and foreland basin, and 2) Lower Silurian and 3) Lower Devonian foreland basins. Potential for HTD in Upper Silurian to lowermost Devonian reefal complexes is also envisaged. Traps and seals are multiple and include various stratigraphic (pinchout, impermeable layers and unconformities), tectonic (fault closures, anticlines, duplexes and triangle zones) and diagenetic (HTD) types. Maturation suggests that the Cambrian-Ordovician St. Lawrence Platform has a gas (southern Québec) to oil (western Newfoundland) potential; the coeval Humber Zone has a gas (Québec) to gas and oil (western Newfoundland) potential. The Late Ordovician to Middle Devonian Gaspé Belt has both gas to oil potential. Correlation of chemical and isotopic fingerprints of source rock extracts and oils from wells in the Silurian-Devonian Gaspé Belt indicate that Ordovician source rock(s) likely fed the known accumulations. This supports the documented hydrocarbon migration events in Early Silurian time, Lower Devonian source rocks could also have played some role at specific localities.