Dispersion of elastic waves in carbonate rocks

Ida L. Fabricius, Gregor P. Eberli

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

2 Scopus citations

Abstract

The relationship between frequency and velocity of elastic waves through water saturated carbonate sedimentary rocks can be studied indirectly by comparing data measured at one ultrasonic frequency on samples with a wide range of characteristic frequencies as defined by Biot (1956a, b). The characteristic frequency can be calculated from porosity and permeability. Data measured under dry conditions may be Gassmann substituted and then indirectly correspond to low frequency data (Gassmann 1951). Samples measured below their characteristic frequency display an apparent negative dispersion where velocity in the water saturated case is lower than would be expected according to Biot theory. This effect could rather be due to frame-softening than to dispersion. Samples measured above their characteristic frequency display positive dispersion. In most cases the dispersion matches the one expected from Biot's model; but in a significant number of cases a squirt flow mechanism may be invoked, where the squirt probably is a consequence of a heterogeneous depositional texture giving rise to a heterogeneous pore structure.

Original languageEnglish (US)
Title of host publication79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009
PublisherSociety of Exploration Geophysicists
Pages1955-1959
Number of pages5
ISBN (Print)9781615675661
StatePublished - Jan 1 2009
Event79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009 - Houston, United States
Duration: Oct 25 2009Oct 30 2009

Publication series

Name79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009

Other

Other79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009
CountryUnited States
CityHouston
Period10/25/0910/30/09

ASJC Scopus subject areas

  • Geophysics

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  • Cite this

    Fabricius, I. L., & Eberli, G. P. (2009). Dispersion of elastic waves in carbonate rocks. In 79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009 (pp. 1955-1959). (79th Society of Exploration Geophysicists International Exposition and Annual Meeting 2009, SEG 2009). Society of Exploration Geophysicists.