Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling

Ida L. Fabricius, Gregor T. Bächle, Gregor P Eberli

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

Abstract

Elastic moduli of water saturated sedimentary rocks have in some cases been found to be lower than what would be expected from Gassmann-substitution of moduli for rocks in the dry state, Such water weakening of elastic moduli of carbonate sedimentary rocks may be discussed by effective medium modeling. In the present case we use the iso-frame model, which is based on upper Hashin-Shtrikman bounds for mixtures of a stiff carbonate frame and a suspension of carbonate particles in fluid. The proportion of carbonate in the frame is given as the iso-frame value ranging from zero to one. We model ultrasonic compressional wave and shear wave data for dry and water saturated samples from a range of geological settings. Our modeling indicates that water weakening is related to permeability. Samples with permeability up to 1 mD have relatively high water weakening possibly as a consequence of fluid interaction with the relatively frequent crystal contacts in the low-permeability samples. For samples with permeability above 100 mD we rather find a stiffening of water saturated samples. This may be a dispersion effect, as high permeability and high frequency may cause the water in the water saturated samples to move out of phase with the solid during propagation of the sonic wave and thus cause a stiffening effect.

Original languageEnglish (US)
Title of host publication78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008
PublisherSociety of Exploration Geophysicists
Pages1680-1684
Number of pages5
ISBN (Print)9781605607856
StatePublished - Jan 1 2018
Event78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008 - Las Vegas, United States
Duration: Nov 9 2008Nov 14 2008

Other

Other78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008
CountryUnited States
CityLas Vegas
Period11/9/0811/14/08

Fingerprint

elastic modulus
carbonates
modulus of elasticity
carbonate
permeability
water
modeling
stiffening
sedimentary rocks
sedimentary rock
fluid
causes
fluids
ultrasonic radiation
carbonate rock
S waves
S-wave
proportion
substitution
rocks

ASJC Scopus subject areas

  • Geophysics

Cite this

Fabricius, I. L., Bächle, G. T., & Eberli, G. P. (2018). Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling. In 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008 (pp. 1680-1684). Society of Exploration Geophysicists.

Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling. / Fabricius, Ida L.; Bächle, Gregor T.; Eberli, Gregor P.

78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008. Society of Exploration Geophysicists, 2018. p. 1680-1684.

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

Fabricius, IL, Bächle, GT & Eberli, GP 2018, Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling. in 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008. Society of Exploration Geophysicists, pp. 1680-1684, 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008, Las Vegas, United States, 11/9/08.
Fabricius IL, Bächle GT, Eberli GP. Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling. In 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008. Society of Exploration Geophysicists. 2018. p. 1680-1684
Fabricius, Ida L. ; Bächle, Gregor T. ; Eberli, Gregor P. / Water weakening of elastic moduli of carbonates interpreted by use of iso-frame modeling. 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008. Society of Exploration Geophysicists, 2018. pp. 1680-1684
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