Petroleum inclusions entrapped in diagenetic minerals in Paleozoic basins in eastern Canada - implications for hydrocarbon exploration

CIM MineSpace 2001
Denis Lavoie, Rudolf Bertrand,
Abstract Formation of petroleum reservoirs requires a good combination of source rocks, reservoirs, and traps. Because these factors change with time, a good understanding of the timing of petroleum migration is a key element in exploration. Petroleum inclusions entrapped in diagenetic minerals provide a unique constraint on the timing of hydrocarbon migration. For example, the occurrence of abundant oil inclusions in calcite cements in the Macumber Formation at Jubilee Zn-Pb deposit, Cape Breton, testifies the formation of an oil reservoir after the Ainslie detachment faulting and before Zn-Pb mineralization. The occurrence of oil inclusions in the late pore-filling calcite cement in the Romaine Formation on Anticosti indicates an oil migration event after the porosity-generating dolomitization process. Petroleum inclusions were studied in various successions in the Paleozoic basins in eastern Canada, including the St. Lawrence Platform, the Humber Zone, the Gaspé Belt, and the Maritimes Basin. The characteristics of the petroleum inclusions generally change with tectonic setting as well as thermal maturity of the host rocks: oil inclusions occur in upper successions and less mature host rocks, and gas inclusions occur in lower successions and more mature host rocks.
Keywords: Petroleum, eastern Canada, diagenesis, hydrocarbon migration, reservoir, Fluid inclusions, Paleozoic basins
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