Anisotropy of electrical conductivity of dry and saturated KTB samples

Laštovičková, Marcela; Losito, G.; Trova, A.

doi:10.1016/0031-9201(93)90138-y

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…In one study (26), biotite gneiss from the KTB drill hole was conductive at high temperature, reaching 0.1 Sim at 1000°C. These data show little pressure dependence up to 40 MPa but are anisotropic, and hence the conductivity was attributed to phyllosilicates.…”

Section: W 8 Davismentioning

confidence: 99%

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Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Boerner

Kurtz

Craven

et al. 1999

Science

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The subcrustal lithosphere underlying the southern Archean Churchill Province (ACP) in western Canada is at least one order of magnitude more electrically conductive than the lithosphere beneath adjacent Paleoproterozoic crust. The measured electrical properties of the lithosphere underlying most of the Paleoproterozoic crust can be explained by the conductivity of olivine. Mantle xenolith and geological mapping evidence indicate that the lithosphere beneath the southern ACP was substantially modified as a result of being trapped between two nearly synchronous Paleoproterozoic subduction zones. Tectonically induced metasomatism thus may have enhanced the subcrustal lithosphere conductivity of the southern ACP.

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Section: W 8 Davismentioning

confidence: 99%

“…;cled to the mantle. although in amounts \veal< enough not to compromise completely the isotopic signature of the degassed mantle conlponrnt (26). Conversely.…”

mentioning

confidence: 99%

Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Boerner

Kurtz

Craven

et al. 1999

Science

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“…In fact the CH5 samples appeared to be 3 orders of magnitude more resistive than the SOM7 sample, in spite of a very similar macroscopic appearance. These initial measurements also indicate a strong anisotropy effect (Lastovickova et al . 1993) in the CH5 samples.…”

Section: Laboratory Experimental Methodsmentioning

confidence: 81%

Microscopic scale conductivity as explanation of magnetotelluric results from the Alps of Western Switzerland

Losito

Schnegg

Lambelet

et al. 2001

Geophysical Journal International

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SUMMAR YRecent MT soundings carried out in the Penninic Alps of Valais have shown the presence of a very good, outcropping conductor. Extremely high conductivity was attributed to the presence of graphite.To verify this assumption, the electrical properties of borehole black shales were measured under simulated physical conditions (electrical frequency, hydrostatic confining pressure, internal fluid pressure, temperature). These measurements showed that under all physical conditions (electrical frequency, in the 0.005-200 Hz interval; hydrostatic confining pressure up to 39 MPa; internal fluid pressure up to 23 MPa; temperature up to 180 uC) one of the samples studied was very conductive (resistivity less than 2 Vm under all physical conditions). Interestingly, despite similar macroscopic aspect, other samples from a nearby borehole were found to be only slightly conductive. Chemical, mineralogical and petrographic investigations revealed that the enhanced electrical conductivity is mostly due to textural characteristics (such as grain size and carbon film distribution at the grain boundaries) rather than to chemical differences.

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“…This hierarchical subdivision is based on international conventions (e.g. Bates and Jackson, 1987;Gillespie and Styles, 1999;Robertson, 1999;Hallsworth and Knox, 1999;Le Bas and Streckeisen, 1991;Schmid, 1981;Fisher and Smith, 1991). Furthermore, the classification corresponds to the subdivision provided by existing property data compilations such as Hantschel and Kauerauf (2009), Schön (2011), and Clauser and Huenges (1995a, b).…”

Section: Petrography or Rock Typementioning

confidence: 99%

The PetroPhysical Property Database (P<sup>3</sup>) – a global compilation of lab-measured rock properties

Bär

Reinsch

Sippel

2020

Earth Syst. Sci. Data

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Abstract. Petrophysical properties are key to populating local and/or regional numerical models and to interpreting results from geophysical investigation methods. Searching for rock property values measured on samples from a specific rock unit at a specific location might become a very time-consuming challenge given that such data are spread across diverse compilations and that the number of publications on new measurements is continuously growing and data are of heterogeneous quality. Profiting from existing laboratory data to populate numerical models or interpret geophysical surveys at specific locations or for individual reservoir units is often hampered if information on the sample location, petrography, stratigraphy, measuring method and conditions is sparse or not documented. Within the framework of the EC-funded project IMAGE (Integrated Methods for Advanced Geothermal Exploration, EU grant agreement no. 608553), an open-access database of lab-measured petrophysical properties has been developed (Bär et al., 2017, 2019b: P3 – database, https://doi.org/10.5880/GFZ.4.8.2019.P3. The goal of this hierarchical database is to provide easily accessible information on physical rock properties relevant for geothermal exploration and reservoir characterisation in a single compilation. Collected data include classical petrophysical, thermophysical, and mechanical properties as well as electrical conductivity and magnetic susceptibility. Each measured value is complemented by relevant meta-information such as the corresponding sample location, petrographic description, chronostratigraphic age, if available, and original citation. The original stratigraphic and petrographic descriptions are transferred to standardised catalogues following a hierarchical structure ensuring inter-comparability for statistical analysis (Bär and Mielke, 2019: P3 – petrography, https://doi.org/10.5880/GFZ.4.8.2019.P3.p; Bär et al., 2018, 2019a: P3 – stratigraphy, https://doi.org/10.5880/GFZ.4.8.2019.P3.s). In addition, information on the experimental setup (methods) and the measurement conditions are listed for quality control. Thus, rock properties can directly be related to in situ conditions to derive specific parameters relevant for simulating subsurface processes or interpreting geophysical data. We describe the structure, content and status quo of the database and discuss its limitations and advantages for the end user.

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Anisotropy of electrical conductivity of dry and saturated KTB samples

Cited by 9 publications

References 4 publications

Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Microscopic scale conductivity as explanation of magnetotelluric results from the Alps of Western Switzerland

The PetroPhysical Property Database (P<sup>3</sup>) – a global compilation of lab-measured rock properties

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Anisotropy of electrical conductivity of dry and saturated KTB samples

Cited by 9 publications

References 4 publications

Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Electrical Conductivity in the Precambrian Lithosphere of Western Canada

Microscopic scale conductivity as explanation of magnetotelluric results from the Alps of Western Switzerland

The PetroPhysical Property Database (P&lt;sup&gt;3&lt;/sup&gt;) – a global compilation of lab-measured rock properties

Contact Info

Product

Resources

About

The PetroPhysical Property Database (P<sup>3</sup>) – a global compilation of lab-measured rock properties