Abstract
The Anticosti Basin is a large (~120,000 km) lower Paleozoic sedimentary basin covering the northern part of Gulf of St. Lawrence, including the whole Anticosti Island, in eastern Canada. The basin consists of two sedimentary packages, a Cambrian (?) to Lower Ordovician passive margin succession and a Middle Ordovician to Lower Devonian foreland basin succession. Rich and extensive source rocks have been identified in the Upper Ordovician Macasty Formation, which has been buried to oil and gas windows, but no economic hydrocarbon accumulations have been discovered so far. One of the main uncertainties in hydrocarbon exploration deals with the direction of hydrocarbon migration, which influences the selection of reservoir targets. Of particular interest is the development of high porosities in the hydrothermally dolomitized carbonates of the Lower and Middle Ordovician Romaine and Mingan formations which lie below the Macasty source rocks. Although indicators of hydrocarbon migration in these potential reservoir rocks have been found, doubts remain about hydrocarbon migration pathways into these carbonate beds. Numerical simulations were carried out to model the evolution
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