Induced polarization measurements of sandstones under elevated pressure
- Cesar Mapeli (Colorado School of Mines) | Liwei Ou (Colorado School of Mines) | Manika Prasad (Colorado School of Mines)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- Induced polarization (IP), Isotropic, Multiphysics, Electrical/resistivity
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- 9 since 2007
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Understanding of the pore structure of rocks and its pressure dependency has been a long-standing area of interest. More recently, pore structures and pore sizes have been mapped using induced polarization measurements (Revil et al. 2014, Niu et al., 2016). However, studies on the pressure dependency of Complex Resistivity (CR), also known as Induced Polarization (IP), and how they relate to pore deformation are almost non-existent.
In this study, we performed IP measurement on three sandstone samples with little to no clay content and observed the changes in real and quadrature conductivity with increasing confining pressure, while pore pressure was kept constant.
The results from the IP measurements show that the real and quadrature conductivities both decrease with increasing pressure. However, the quadrature conductivity further shows a systematic shift in the peak frequency towards lower frequencies. This shift towards lower frequencies implies that surface area is more sensitive to pressure change than bulk pore volume.
Presentation Date: Tuesday, October 16, 2018
Start Time: 1:50:00 PM
Location: 202A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||664 KB||Number of Pages||6|
Archie,G. E.,1942,The electrical resistivity log as an aid in determining some reservoir characteristics:Petroleum Transactions of the AIME,146,54–62,10.2118/942054-G.
Lockner,D. A., andJ. D.Byerlee,1985,Complex resistivity measurements of confined rock:Journal of Geophysical Research,90,7837–7847,10.1029/JB090iB09p07837.
Longeron,D. G.,M. J.Argaud, andJ.-P.Feraud,1989,Effect of overburden pressure and the nature and microscopic distribution of fluids on electrical properties of rock samples:SPE Formation Evaluation,4,194–202,10.2118/15383-PA.
Mahmood,S. M.,N. L.Maerefat, andM.-M.Chang,1991,Laboratory measurements of electrical resistivity at reservoir conditions:SPE Formation Evaluation,6,291–300,10.2118/18179-PA.
Niu,Q.,M.Prasad,A.Revil, andM.Saidian,2016,Textural control on the quadrature conductivity of porous media:Geophysics,81,E297–E309,10.1190/geo2015-0715.1.
Revil,A.,N.Florsch, andC.Camerlynck,2014,Spectral induced polarization porosimetry:Geophysical Journal International,198,1016–1033,10.1093/gji/ggu180.