Estimating permeability of carbonate rocks from porosity and vp/vs

Ida L. Fabricius, Gregor Baechle, Gregor P Eberli, Ralf Weger

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We present a method for predicting permeability from sonic and density data. The method removes the porosity effect on the ratio vp/ vs of dry rock, and it addresses the specific surface as an indirect measure of permeability. We look at ultrasonic data, porosity, and the permeability of 114 carbonate core plugs. In doing so, we establish an empirical relationship between the specific surface of the solid phase (as calculated by Kozeny's equation) and vp/ vs (linearly transformed to remove the porosity effect). One must view the specific surface derived by using Kozeny's equation as an effective specific surface because Kozeny's equation only holds for homogeneous rock with interconnected pores. The ratio vp/ vs of dry rocks, on the other hand, seems to be controlled by the true specific surface, pointing to an inherent limitation in the method. The 114 carbonate plugs originate in three geological settings and comprise 83 calcitic and 31 dolomitic samples. Their depositional texture varies from mud-dominated to grain-dominated and recrystallized types. Our research applies the relationship to 137 carbonate samples from two different depositional settings. We find a reasonable match between predicted and measured permeability. The match is better for samples with carbonate mud-filled depositional textures than for carbonate mud-poor depositional textures. Diagenetic factors such as vuggy porosity decrease the predictability of permeability.

Original languageEnglish (US)
JournalGeophysics
Volume72
Issue number5
DOIs
StatePublished - Sep 2007

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Carbonates
carbonate rock
carbonates
permeability
estimating
Porosity
porosity
Rocks
rocks
mud
carbonate
textures
Textures
texture
plugs
rock
Density (specific gravity)
solid phases
ultrasonics
Ultrasonics

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Estimating permeability of carbonate rocks from porosity and vp/vs . / Fabricius, Ida L.; Baechle, Gregor; Eberli, Gregor P; Weger, Ralf.

In: Geophysics, Vol. 72, No. 5, 09.2007.

Research output: Contribution to journalArticle

Fabricius, Ida L. ; Baechle, Gregor ; Eberli, Gregor P ; Weger, Ralf. / Estimating permeability of carbonate rocks from porosity and vp/vs . In: Geophysics. 2007 ; Vol. 72, No. 5.
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