Modeling velocity in carbonates using a dual porosity DEM model

Gregor T. Baechle, Arnout Colpaert, Gregor P Eberli, Ralf J. Weger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The differential effective medium theory is used to model the velocity of carbonates with two predefined end-member pore types and under dry and water saturated conditions. The dual porosity DEM takes into account input parameters derived from digital image analysis of thin sections. In particular the respective amount of microporosity and macroporosity and the aspect ratio of the macropores are incorporated. A conceptual aspect ratio of 0.1 for micropores and a measured aspect ratio of 0.5 for macropores is used as input parameters for the differential effective medium (DEM) model. The model predicts that the compliant micropores have a strong influence on the sonic velocity of porous carbonates because increasing concentrations of micropores reduce the rock stiffness. The model values are compared to high frequency (1MHz) laboratory velocity measurements. These velocity predictions with the dual porosity DEM model show significant better velocity prediction than empirical models, e.g. the Wyllie times average equation. We obtain a root-mean-square-error of 392 m/s when comparing predicted with measured velocity values. Our results also show that a differential effective medium model that uses measured input parameters from quantitative digital image analysis improves estimates of acoustic properties of carbonates.

Original languageEnglish (US)
Title of host publicationSociety of Exploration Geophysicists - 77th SEG International Exposition and Annual Meeting, SEG 2007
PublisherSociety of Exploration Geophysicists
Pages1589-1593
Number of pages5
ISBN (Print)9781604238976
StatePublished - Jan 1 2007
Event77th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2007 - San Antonio, United States
Duration: Sep 23 2007Sep 26 2007

Other

Other77th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2007
CountryUnited States
CitySan Antonio
Period9/23/079/26/07

ASJC Scopus subject areas

  • Geophysics

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