1887
Volume 64, Issue 3
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Seismoelectric coupling coefficients are difficult to predict theoretically because they depend on a large numbers of rock properties, including porosity, permeability, tortuosity, etc. The dependence of the coupling coefficient on rock properties such as permeability requires experimental data. In this study, we carry out a set of laboratory measurements to determine the dependence of seismoelectric coupling coefficient on permeability. We use both an artificial porous “sandstone” sample, with cracks, built using quartz‐sand and Berea sandstone samples. The artificial sample is a cube with 39% porosity. Its permeability levels are anisotropic: 14.7 D, 13.8 D, and 8.3 D in the ‐, ‐, and ‐directions, respectively. Seismoelectric measurements are performed in a water tank in the frequency range of 20 kHz–90 kHz. A piezoelectric P‐wave source is used to generate an acoustic wave that propagates through the sample from the three different (, , and ) directions. The amplitudes of the seismoelectric signal induced by the acoustic waves vary with the direction. The highest signal is in the direction of the highest permeability, and the lowest signal is in the direction of the lowest permeability. Since the porosity of the sample is constant, the results directly show the dependence of seismoelectric coefficients on permeability. Seismoelectric measurements with natural rocks are performed using Berea sandstone 500 and 100 samples. Because the Berea samples are nearly isotropic in permeability, the amplitudes of the seismoelectric signals induced in the different directions are the same within the measurement error. Because the permeability of Berea 500 is higher than that of Berea 100, the amplitude of the seismoelectric signals induced in Berea 500 is higher than those in Berea 100. To determine the relative contributions of porosity and permeability on seismoelectric conversion, we carried out an analysis, using Pride (1994) formulation and Kozeny–Carman relationship; the normalized amplitudes of seismoelectric coupling coefficients in three directions are calculated and compared with the experimental results. The results show that the seismoelectric conversion is related to permeability in the frequency range of measurements. This is an encouraging result since it opens the possibility of determining the permeability of a formation from seismoelectric measurements.

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2015-09-28
2024-03-28
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References

  1. GaramboisS. and DietrichM.2001. Seismoelectric wave conversions in porous media: field measurements and transfer function analysis. Geophysics66(4), 1417–1430.
    [Google Scholar]
  2. GuanW., HuH. and WangZ.2012. Permeability inversion from low‐frequency seismoelectric logs in fluid‐saturated porous formations. Geophysical Prospecting61(1), 120–133.
    [Google Scholar]
  3. HuH., WangK. and WangJ.2000. Simulation of acoustically induced electromagnetic field in a borehole embedded in a porous formation. In: Borehole Acoustics Annual Report, Earth Resources Laboratory. Massachusetts Institute of Technology.
    [Google Scholar]
  4. JardaniA., RevilA., SlobE. and SöllnerW.2010. Stochastic joint inversion of 2D seismic and seismoelectric signals in linear poroelastic materials: a numerical investigation. Geophysics75(1), N19–N31.
    [Google Scholar]
  5. MavkoG., MukerjiT. and DvorkinJ.2009. The Rock Physics Handbook: Tool for Seismic Analysis of Porous Media. Cambridge University Press.
    [Google Scholar]
  6. MikhailovO.V., QueenJ. and ToksözM.N.2000. Using borehole electroseismic measurements to detect and characterize fractured (permeable) zones. Geophysics65, 1098–1112.
    [Google Scholar]
  7. MorganF.D., WilliamsE.R. and MaddenT.R.1989. Streaming potential properties of Westerly granite with applications. Journal of Geophysical Research94, 12449–12461.
    [Google Scholar]
  8. PrideS.1994. Governing equations for the coupled electromagnetics and acoustics of porous media. Physical Review B50, 15678–15696.
    [Google Scholar]
  9. ZhanX.2009. Transport and seismoelectric properties of porous permeable rock: numerical modeling and laboratory measurements. PhD thesis, Massachusetts Institute of Technology, USA.
    [Google Scholar]
  10. ZhanX., SchwartzL.M., ToksözM.N., SmithW.C. and MorganF. D.2010. Pore‐scale modeling of electrical and fluid transport in Berea sandstone. Geophysics75, F135–F142.
    [Google Scholar]
  11. ZhuZ. and ToksözM.N.2003. Crosshole seismoelectric measurements in borehole models with fractures. Geophysics68, 1519–1524.
    [Google Scholar]
  12. ZhuZ. and ToksözM.N.2005. Seismoelectric and seismomagnetic measurements in fractured borehole models. Geophysics70, F45–F51.
    [Google Scholar]
  13. ZhuZ. and ToksözM.N.2013. Experimental measurements of the streaming potential and seismoelectric conversion in Berea sandstone. Geophysical Prospecting61, 688–700.
    [Google Scholar]
  14. ZhuZ., ToksözM.N., and BurnsD.R.2008. Electroseismic and seismoelectric measurements of rock samples in a water tank. Geophysics73, E153–E164.
    [Google Scholar]
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  • Article Type: Research Article
Keyword(s): Anisotropic permeability; Laboratory measurements; Seismoelectric

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