EGU21-12490
https://doi.org/10.5194/egusphere-egu21-12490
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Electrical-elastic modelling of rocks using cross-property DEM

Phillip Cilli1 and Mark Chapman2
Phillip Cilli and Mark Chapman
  • 1Department of Earth Sciences, University of Oxford, United Kingdom of Great Britain – England, Scotland, Wales (phillip.cilli@earth.ox.ac.uk)
  • 2School of GeoSciences, University of Edinburgh, United Kingdom of Great Britain – England, Scotland, Wales

The combination of electrical and elastic measurements can be useful in lowering subsurface characterisation uncertainty. The majority of rock physics relations which relate a rock’s electrical and elastic properties, however, rely on the estimation of porosity as an intermediate step. By combining differential effective medium schemes which relate a rock’s electrical and elastic properties to porosity and pore shape, we obtain cross-property expressions which are independent of porosity, depending only on pore aspect ratio. Analysing published joint electrical-elastic measurements shows the cross-property model works well for clean sandstones, and models Vp/Vs ratios as a function of resistivity without porosity. Although clay-bearing sandstones are more complex, our model can still identify the correct trends. On theoretical grounds, it seems our approach has the potential to produce additional cross-property relations; a topic upon which we speculate.

How to cite: Cilli, P. and Chapman, M.: Electrical-elastic modelling of rocks using cross-property DEM, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12490, https://doi.org/10.5194/egusphere-egu21-12490, 2021.

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