The recent article by Ehrenberg and Nadeau (2005) presents a useful compilation of porosity, permeability, lithology, geothermal gradients, and preuplift depths for the Alberta basin in Canada and other petroleum reservoirs around the world. The authors state that “the relative paucity of low-porosity (0–8%) siliciclastic reservoirs at all depths compared with carbonates may reflect the most common occurrence of fractures in carbonates and the effectiveness of these fractures for facilitating economic flow rates in low-porosity rock” (Ehrenberg and Nadeau, 2005, p. 435). One purpose of this discussion is to present data for 5915 reservoirs that tend to support...

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