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Whole core versus plugs; scale dependence of porosity and permeability measurements in platform carbonates

S. N. Ehrenberg
Whole core versus plugs; scale dependence of porosity and permeability measurements in platform carbonates
AAPG Bulletin (June 2007) 91 (6): 835-846

Abstract

This study compares laboratory measurements of porosity and permeability between twenty-three whole-core samples and fifty-four 1-in. (25-mm) plugs drilled from the centers of the same samples. All samples are coarsely bioclastic carbonates from Miocene carbonate platforms of the Marion Plateau, offshore northeast Australia (1 limestone and 22 dolostones). Whole-core porosities tend to be slightly higher (average 1.4 porosity units) than plug porosities, probably reflecting a lower surface/volume ratio for the larger samples. Permeability differences between whole cores and plugs vary greatly from sample to sample, but whole-core permeability tends to be higher in cases where larger differences are observed. This tendency may reflect flow through optimal-flow networks that occupy a small proportion of the total rock volume and are therefore not included within most plugs. Previous studies suggest that increasing permeability with sample scale may be a general characteristic of heterogeneous porous media. The present results provide a quantitative basis for evaluating the necessity and advantages of using whole cores as opposed to plugs for petrophysical characterization of carbonate reservoirs.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 91
Serial Issue: 6
Title: Whole core versus plugs; scale dependence of porosity and permeability measurements in platform carbonates
Author(s): Ehrenberg, S. N.
Affiliation: Statoil, Stavanger, Norway
Pages: 835-846
Published: 200706
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 20
Accession Number: 2007-065504
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S21°04'60" - S20°10'00", E151°45'00" - E153°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 200733
Program Name: ODPOcean Drilling Program
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