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Sandstone vs. carbonate petroleum reservoirs: A global perspective on porosity-depth and porosity-permeability relationships: Reply

¹ Statoil ASA N-4035 Stavanger, Norway; PHN@statoil.com
² Present address: Department of Geology, United Arab Emirates University, P.O. Box 17551, Al Ain, United Arab Emirates; sne@uaeu.ac.ae

The first 20% of the full text of this article appears below.

We welcome Aguilera's (2006) constructive discussion of Ehrenberg and Nadeau's (2005) global compilation of reservoir data. It demonstrates additional applications of these valuable data in the area of reservoir engineering and improved oil recovery, which is an ever-increasing focus area for our industry. This is a particularly challenging task in carbonate reservoirs, which are commonly characterized by extreme complexity and heterogeneity. Yet it is precisely from these reservoirs where the rewards in terms of improved recovery potential can be the greatest.

In our own experience, we have found the global distribution for carbonate reservoir properties useful in describing porosity and permeability variability, even at the individual reservoir level. As an example of carbonate reservoir heterogeneity, consider the core analysis measurements from a Middle Eastern carbonate reservoir (Figure 1), which show five orders of magnitude variation in permeability, with an extremely poor relation between porosity and permeability. The mean values of porosity and permeability (large plotting symbol), however, agree well with the median (P₅₀) global relation for carbonate reservoir average values (about 22% porosity and 80 md permeability; see Ehrenberg and Nadeau, 2005, their figure 4b). Furthermore, the potential ability to estimate pore-throat apertures from . . . [Full Text of this Article]

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