The effect of a variable pore radius on formation resistivity factor

Müller-Huber, Edith; Schön, Jürgen H.; Börner, F.

doi:10.1016/j.jappgeo.2015.03.011

Cited by 24 publications

(10 citation statements)

References 16 publications

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“…Firstly, the mudstone formations possess enlarged σ 0 andτ parallel to the foliation, which is in accordance with earlier considerations regarding the effect of tortuosity on electrical conductivity (e.g. Kozeny 1927;Pape, Riepe and Schopper 1982;Revil et al 2013;Müller-Huber, Schön and Börner 2015). Pore space and consequently current flow channels deform during compaction, which leads to a decreased tortuosity parallel to the foliation that enhances an efficient current flow (e.g.…”

Section: Discussion Anisotropy Mechanisms and Complex Conducsupporting

confidence: 86%

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Anisotropic complex electrical conductivity of black shale and mudstone from the Moffat Shale Group (Ireland)

Römhild

Sonntag

Kiyan

et al. 2019

Near Surface Geophysics

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The geological setting in the north of Ireland, especially concerning the origin of the Moffat Shale Group, has long been under discussion. Within the Tellus Programme of the Geological Survey Ireland, airborne electromagnetic measurements revealed high‐conductivity anomalies that have been interpreted as the response of a black shale. In order to petrophysically characterize the Moffat Shale, a laboratory study using material from two shallow boreholes was carried out. The study focuses on spectral induced polarization measurements on 23 oriented samples in the frequency range from 10−4 to 105 Hz. The sample material can be categorized into two groups. A mudstone‐like rock type shows weakly frequency‐dependent, porosity‐driven conductivities with a strong anisotropy. On the other hand, black shale samples are characterized by moderately anisotropic but strong polarization effects especially at low frequencies and a strong conductivity increase towards higher frequencies. The polarization in the black shale is controlled by the texture and volume fraction of the polarizable components. The spectral induced polarization data are processed by means of a Debye decomposition approach. The anisotropy of the complex electrical conductivity is determined by utilizing the foliation dip angle and assuming tilted transverse isotropic conditions. The relevance of the laboratory findings for airborne electromagnetic surveys is addressed with a synthetic one‐dimensional modelling study.

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Section: Discussion Anisotropy Mechanisms and Complex Conducsupporting

confidence: 86%

“…Kozeny ; Pape, Riepe and Schopper ; Revil et al . ; Müller‐Huber, Schön and Börner ). Pore space and consequently current flow channels deform during compaction, which leads to a decreased tortuosity parallel to the foliation that enhances an efficient current flow (e.g.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic complex electrical conductivity of black shale and mudstone from the Moffat Shale Group (Ireland)

Römhild

Sonntag

Kiyan

et al. 2019

Near Surface Geophysics

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“…Among them are active chemical processes that involve the movement or transfer of electrical charges, such as oxidation‐reduction, cation exchange phenomena, and clay‐organic reactions, which can be differentiated from each other and from reactionless material. A review on the theoretical and empirical concepts for complex conductivity phenomena and measuring techniques can be found in previous works, e.g., Ward (), Börner (), or Schön (). Olhoeft () presented an overview of the properties and state conditions that influence complex conductivity spectra.…”

Section: Introductionmentioning

confidence: 99%

“…Spectral induced polarization (SIP) measurements investigate the fluid‐filled pore volumes, being sensitive to electrochemical processes of electronic–ionic interaction and the size of the mineral–water interface at the grain surfaces. Thus, SIP measurements are, along with porosity, sensitive to changes in pore space geometry (Börner ; Schön ). As complex conductivity measurements provide an estimate of specific surface (e.g., Börner ; Börner, Schopper and Weller ; Weller et al .…”

Section: Introductionmentioning

confidence: 99%

“…() studied the effect of CO 2 injection on water‐saturated porous media under various pressures and temperatures and observed an increase in electrolytic conductivity predominantly due to dissociation processes. In addition, textural effects on the hydraulic and electrical conductivity values of sedimentary rocks were studied by Müller‐Huber, Schön and Börner (, ). The authors introduced a theoretical formulation for Archie’s experimentally observed relationship and found that exponent

m

is controlled by porosity and the ratio of pore body to pore throat radius.…”

Section: Introductionmentioning

confidence: 99%

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The effect of compaction on complex electrical resistivity of shaly sands

Börner

Müller-Huber

Branka

et al. 2017

Near Surface Geophysics

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Pore space properties of sedimentary rocks are of fundamental importance with regard to reservoir evaluation and fluid flow modelling or special geotechnical applications such as stability considerations for reservoirs, dams, or embankments. Processes such as compaction due to pressure drawdown in weakly consolidated reservoirs, effects caused by stimulation of reservoirs with decreasing productivity, or the compaction of building ground can be effectively studied by verifying and monitoring changes in porosity. The close connections between electrical resistivity or conductivity and pore space geometry as well as a high sensitivity to even slight changes in pore space characterising parameters are well-established.Therefore, the results of complex electrical conductivity measurements in the frequency range from 0.05 Hz to 1 kHz on a set of heterogeneous shaly sand samples during increasing compaction are presented in this study. The major objective of these investigations was to quantify the porosity reduction in shaly sands during the step-wise compaction of the samples in a specially designed measurement cell. Overall, ten unconsolidated shaly sand samples with varying grain size distribution were analysed. In addition, selected shaly sandstone data are presented to enhance the observations made for the sand samples with regard to the potential influence of cementation as expressed by the cementation exponent.With increasing compaction, the measured complex conductivity data of the fully water-saturated samples show two co-occurring effects. On the one hand, the real part decreases due to the dominating effect of Archie's law. On the other hand, the imaginary part increases due to the increasing contribution of interface conductivity. This effect is due to an increase in the internal surface-area-to-porosity ratio. Cementation exponent and the considered porosity range seem to be controlling the magnitude of this effect. These observations may be explained by using a simple complex conductivity model that relates conductivity components to porosity, specific surface area, and cementation exponent. An interpretation algorithm is proposed that allows determining relative porosity variations based on a baseline and a single repeat measurement without prior knowledge of further rock characteristics.To demonstrate the applicability of the algorithm on field measurements, data from spectral induced polarization soundings obtained at a test site for compaction techniques were interpreted. It could be shown that these observations bear further potential for enhancing the prediction of porosity, changes of compaction, and, hence, changes in hydraulic permeability. determination of naturally or artificially induced porosity changes and accompanied changes in permeability or compaction in very heterogeneous sedimentary rocks.Electrical resistivity measurements are frequently used to predict hydraulic conductivity (e.g., Slater and Lesmes 2001) because the transport of charge carriers and mass in the pore space are couple...

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Characterization of Pore Electrical Conductivity in Porous Media by Weakly Conductive and Nonconductive Pores

Zhu

Zhang

et al. 2023

Surv Geophys

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The effect of a variable pore radius on formation resistivity factor

Cited by 24 publications

References 16 publications

Anisotropic complex electrical conductivity of black shale and mudstone from the Moffat Shale Group (Ireland)

Anisotropic complex electrical conductivity of black shale and mudstone from the Moffat Shale Group (Ireland)

The effect of compaction on complex electrical resistivity of shaly sands

Characterization of Pore Electrical Conductivity in Porous Media by Weakly Conductive and Nonconductive Pores

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