--> Abstract: Reservoir Characteristics, Depositional Environments and Potential Oil/Gas Rates of Devonian and Silurian Drilling Targets in the Gaspe Basin, Quebec, by Jean-Sebastien Marcil, Martin Trobec, and Roberto Aguilera; #90039 (2005)

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Reservoir Characteristics, Depositional Environments and Potential Oil/Gas Rates of Devonian and Silurian Drilling Targets in the Gaspe Basin, Quebec

Jean-Sebastien Marcil1, Martin Trobec2, and Roberto Aguilera3
1 JUNEX, Quebec, QC
2 Burlington Resources Inc, Calgary, AB
3 Consultant, Calgary, AB

The Canadian Gaspesie Palaeozoic basin is a 20,000 km2 peninsula located in the south-eastern part of Province of Quebec. Reservoir determination has always been an important issue for exploration in the area. In order to improve the success probability of the exploration effort, a regional petrophysical evaluation of the potential reservoir rock was completed in 2004 by Quebec-based Junex Inc., and Trobec Geology and Servipetrol Ltd. of Calgary. The result of this study suggests good potential in the Silurian and Devonian reservoir rocks.

Surface core sampling and outcrop studies reveal a good reservoir potential for Silurian and Devonian reefs, hydrothermal breccias in Devonian Limestones and Silurian and Devonian clastics. Evaluation of clastic-type potential reservoir yields intergranular porosity up to 15% with a permeability around 35 mD. Carbonate reef complexes have intercrystalline open porosity of 4%. The evaluation of the hydrothermal-type reservoir revealed porosities ranging between 2 and 12%, and permeabilities between <0.01 and 3.6 mD.

The porosity and permeability data were used for estimating pore throat apertures (rp35) and potential oil and gas rates. For the HTD dolomites the rp35 values ranged between approximately 0.3 and 1.5 microns suggesting the presence of micro and mesoports. Potential oil rates from the HTD reservoirs are estimated at 120 BOPD per well (or gas rate equivalent). For the Devonian York River sandstone the rp35 values suggest presence of micro to macroports. In a reservoir of these characteristics the average production could reach 300 BOPD.

This study is an important step for understanding the Gaspe petroleum system. The rock properties and characteristics analyzed will help to better define the potential reservoir in the exploration model and to delineate drilling targets.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005