The spectral induced polarisation of groundwater saturated sandstones

Scott, Jennifer; Schleifer, Norbert; Weller, Andreas; Barker, R. D.

doi:10.3997/2214-4609.201414535

Cited by 4 publications

(7 citation statements)

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“…with a correlation coefficient of 0.73, where Ddominant is in lam and z is in s. This correlation between Ddominant and x is similar to the results given by Scott & Barker (2003) where the dominant pore-throat diameter, Ddominant , is shown to correlate with the phase peak frequency, fpeag, based on a smaller set of samples. Converting the dominant pore-throat value to lam the fit shown by Scott & Barker (2003) is given by Ddominant = 5.9 In z + 27 (16) where the relationship between relaxation time and peak frequency is given by…”

Section: Po/pw : F= A/• Msupporting

confidence: 76%

“…Converting the dominant pore-throat value to lam the fit shown by Scott & Barker (2003) is given by Ddominant = 5.9 In z + 27 (16) where the relationship between relaxation time and peak frequency is given by…”

Section: Po/pw : F= A/• Mmentioning

confidence: 99%

“…The measurement temperature, was the ambient laboratory temperature which was monitored to ensure stability at 20 + 1 ~ Errors due to the experimental system were checked by repeating measurements for a number of samples on a system using circular potential electrodes at the Technical University of Clausthal (TUC), Germany (Scott et al 2003; no significant differences were found. The electrical results are presented in the form of resistivity and phase spectra.…”

Section: Electrical Measurementsmentioning

confidence: 99%

“…For the electrical measurements, all samples were cut into cylindrical cores each measuring (Scott et aL 2003). The samples were then vacuum saturated with a synthetic groundwater containing 60 mg 1-1 Ca 2+, 30 mg 1-1 Mg 2+, 34 mg 1-1 Na +, 142 mg 1-1 CI-, 120 mg 1-1 SO42-and 30 mg 1-1 HCO3-, a chemistry that closely matched the cation concentrations in the Triassic sandstone aquifer measured at the University of Birmingham borehole (Mitchener 2003).…”

Section: Electrical Measurementsmentioning

confidence: 99%

“…Work over the last 20 years has shown that electrical spectroscopy can also provide useful information on non-mineralized sedimentary rocks and soils, from characterization of internal structure to determination of pore-fluid chemistry and contamination (Olhoeft 1985;BOrner et al 1993;Slater & Lesmes 2002). However, in the past, the variation in properties over the lowest frequency range 0.0001-1000 Hz has often been ignored due to either limited measurement capability or because studies focused on rock types with little frequency variation, but it is in this frequency range where the most interesting and useful information is now being obtained Scott & Barker 2003).…”

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confidence: 98%

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Pore geometry of Permo-Triassic sandstone from measurements of electrical spectroscopy

Scott

Barker

2006

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In order to provide an indirect method of estimating the hydraulic properties of sandstone aquifer rocks, electrical spectroscopy measurements were made on PermoTriassic Sandstone over the frequency range 0.0001-1000 Hz. Samples from several boreholes across Britain are shown to exhibit a phenomenon called electrical relaxation, which we have modelled using a generalized Cole-Cole equation. The Cole-Cole parameters correlate well with other hydrogeologically important parameters determined using mercury injection capillary pressure and nitrogen adsorption techniques. Of greatest importance is that the relaxation time, x, is strongly related to the dominant pore-throat size from which intergranular permeability may be estimated. A normalized version of the chargeability appears to be related to the surface conductivity and this gives the possibility of estimating the pore surface area to volume ratio, a value that is important in determining both permeability and sorption. The potential uses of electrical spectroscopy in hydrogeology and many other fields, including geology and petroleum petrophysics, are only now becoming apparent, and further advances are certain.

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Section: Po/pw : F= A/• Msupporting

confidence: 76%

Section: Po/pw : F= A/• Mmentioning

confidence: 99%

Section: Electrical Measurementsmentioning

confidence: 99%

Section: Electrical Measurementsmentioning

confidence: 99%

mentioning

confidence: 98%

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Pore geometry of Permo-Triassic sandstone from measurements of electrical spectroscopy

Scott

Barker

2006

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Characterization of sandstone by electrical spectroscopy for stratigraphical and hydrogeological investigations

Scott

Barker

2005

QJEGH

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Electrical spectroscopy is a development of the geophysical techniques of resistivity and induced polarization in which both the in-phase and quadrature components of conductivity are measured over a range of frequencies, in this study between 0.001 and 1000 Hz. Measurements have been made on Permo–Triassic sandstone samples taken from boreholes across the UK and saturated with a synthetic groundwater solution. Some samples were also selected for saturation with different strengths of sodium chloride solution. The lithology of the samples was examined using optical microscopy and parameters such as porosity and pore-throat size have been measured. From this it is clear that the electrical spectra are strongly influenced by many aspects of the sandstone lithology, including carbonate and quartz cementation. Grain and pore-throat size and their distribution are particularly important factors in the frequency dependence of the spectra. Pore surface area is an important influence on the magnitude of the quadrature conductivity. The information contained in the electrical spectra could be a very useful tool for future investigations in geological stratigraphy, hydrogeology and petroleum geology. Electrical spectroscopy can be used in both surface and borehole geophysical measurements.

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