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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

DOI: 10.1306/05021917345

Carbonate rocks: Matrix Previous HitpermeabilityNext Hit Previous HitestimationNext Hit

Alejandro Cardona,1 and J. Carlos Santamarina2

1Energy Resources and Petroleum Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; [email protected]
2Energy Resources and Petroleum Engineering, KAUST, Thuwal, Saudi Arabia; [email protected]

ABSTRACT

Carbonate rocks store half of the world’s proven oil reserves. Genesis and postdepositional diagenetic processes define the porous network topology and the matrix Previous HitpermeabilityNext Hit. This study compiles a database of porosity, specific surface, mercury porosimetry, and Previous HitpermeabilityNext Hit values extracted Previous HitfromNext Hit published sources and complements the database through a focused experimental study. Specific surface and porosity combine to estimate the pore size (Dsur). Previous HitPermeabilityNext Hit versus Dsur data cluster along a single trend with a slope of 2 in a log–log scale, which is in agreement with the Kozeny–Carman model. Discordant data points correspond to samples with dual porosity or broad pore-size distributions with long tails, where flow channels along larger interconnected pores. Indeed, the detailed analysis of all the porosimetry data in the database shows that Previous HitpermeabilityNext Hit correlates best with the pore size D80, that is, the 80th percentile in pore-size distributions. Once again, the best fit is a power function in terms of (D80)2, analogous to Kozeny–Carman. The prediction uncertainty using D80 is one order of magnitude and has the same degree of uncertainty as more complex models and analyses. This observation suggests an irreducible uncertainty of one order of magnitude in Previous HitpermeabilityNext Hit Previous HitestimationNext Hit Previous HitfromNext Hit index properties such as porosity, mercury porosimetry, and specific surface probably resulting Previous HitfromNext Hit specimen preparation effects, inherent physical differences in permeation versus invasion, and difficulties in data interpretation. These estimates of Previous HitpermeabilityNext Hit are most valuable when specimens are limited to small sizes, such as Previous HitcuttingsNext Hit.

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