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AAPG Bulletin

Abstract

AAPG Bulletin, V. 90, No. 9 (September 2006), P. 1381-1405.

Copyright copy2006. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/03130605104

Making sense of carbonate pore systems

Arve Lønøy1

1Norsk Hydro Oil amp Energy, Sandsliveien 90, N-5049 Sandsli, Bergen, Norway; [email protected]

ABSTRACT

The most widely used pore-type classification systems for carbonate reservoirs are limited by the fact that the relation between porosity and permeability is poorly defined. Existing classification schemes for porosity-permeability data do not, in many cases, optimally integrate sedimentology, diagenesis, and flow-related properties. In many carbonate reservoirs, it is therefore difficult to generate predictive models for reservoir-quality distribution, resulting in significant uncertainty in hydrocarbon reserve calculations.

Based on empirical data, mostly from Europe and the Middle East, a new pore-type classification system has been developed. The new system not only uses elements from existing pore-type classification systems, but also introduces many new elements. The new pore-type system includes 20 pore-type classes that show a predictable relation between porosity and permeability. It combines sedimentologic and diagenetic features with flow-related properties, and reservoir-critical parameters can thus be predicted using sedimentologic and diagenetic models.

A practical example based on data from a Devonian hydrocarbon field shows that pore-type variations may account for several-hundred-percent differences in calculated hydrocarbon reserves.

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