Dependence Of Sandstone Dielectric Behaviour On Moisture Content And Lithology

West, L. J.; Huang, Yuru; Handley, Kirk

doi:10.3997/2214-4609-pdb.192.gtd_5

Cited by 4 publications

(2 citation statements)

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“…This behavior of the dielectric reck properties will enable the understanding of the field data from the aquifers and the oil reservoir sandstone [19]. With the introduction of Maxwell's equations for the time-dependent development of the magnetic and electric field properties.…”

Section: Fig 3 -Dielectric Behavior Of Saturated Reservoir Sandstone ...mentioning

confidence: 99%

Ionic Surface Dielectric Properties Distribution on Reservoir Sandstone

Sikiru,

Owolabi Afolabi,

Omran

et al. 2021

IJIE

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The petrophysical and dielectric properties for both carbonate and saturated sandstone with monovalent and divalent electrolyte they are accurately modeling of an isotropic dielectric properties has been the major research area in oil and gas industries for effective sweep efficiency. The reservoir petrophysical properties consist of cation and anion exchange capacity on a specific area and the sandstone porosity. The transportation of the ions is a charge carrier that mediates conduction in the pore fluids under the electrical double layers that exist between the minerals and the pore fluids interface. The dielectric anisotropic and the frequency-dependent behavior of reservoir sandstone with the minerals will be fully elucidated, it was revealed from the result obtained the effect of the anisotropic dielectric properties on the reservoir sandstone based on the influx of NaCl electrolyte modify the wettability of rock formation from oil-wet to water-wet at 9000 and 11000 ppm concentration with the aids of the electromagnetic field. The resistivity index of the reservoir sandstone reduces with the increase of electrolyte to the system.

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Section: Fig 3 -Dielectric Behavior Of Saturated Reservoir Sandstone ...mentioning

confidence: 99%

Ionic Surface Dielectric Properties Distribution on Reservoir Sandstone

Sikiru,

Owolabi Afolabi,

Omran

et al. 2021

IJIE

View full text Add to dashboard Cite

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“…Using the established baseline surveys carried out on February 1 and 2, 1999, it is possible to determine changes in moisture content due to tracer loading.The CRIM model of the dielectric-saturation relationship show significant sensitivity of predicted moisture content to dielectric parameters, as illustrated earlier inFigure 4for the background ZOP survey results. The adopted CRIM model parameter (es) was derived from samples of the main lithology; however,West et al [2001] show that finer-grain size samples taken from the core have larger values and thus limit the use of such an approach for determination of absolute moisture contents. Changes in saturation, however, are insensitive to the dielectric constant of the sediment grains since, for the CRIM model given in (1), the change in volumetric moisture content saturation at time t, S o is background saturation, õt is the observed bulk dielectric constant at time t, and õo is the observed background bulk dielectric constant.…”

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2001

Water Resources Research

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Characterization of the dynamics of moisture migration in the unsaturated zone of aquifers is essential if reliable estimates of the transport of pollutants threatening such aquifers are to be made. Electrical geophysical investigation techniques, such as ground-penetrating radar, offer suitable methods for monitoring moisture content changes in the vadose zone. Moreover, these tools permit relatively large measurement scales, appropriate for hydrological models of unsaturated processes, and thus they offer a distinct advantage over conventional measurement approaches. Ground-penetrating radar, when applied in transmission mode between boreholes, can provide high-resolution information on lithological and hydrological features. The technique may be applied in tomographic mode and in a much simpler vertical profile mode. Both modes of measurement have been utilized using two boreholes 5 m apart located at a field site in the UK Sherwood Sandstone aquifer. Radar transmission measurements have been used to characterize the change in moisture content in unsaturated sandstone due to controlled water tracer injection. Continual monitoring of cross-borehole radar measurements over an 18 month period has also permitted determination of travel times of natural loading to the system and has revealed the impact of subtle contrasts in lithology on changes in moisture content over time. The time series of inferred moisture contents show clearly wetting and drying fronts migrating at a rate of approximately 2 m month-• throughout the sandstone. 1.

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