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Dataset

Electrical Resistivity of Cores of the KTB Pilot Hole VB1

Cite as:

KTB, WG Geophysics (2010): Electrical Resistivity of Cores of the KTB Pilot Hole VB1. Deutsches GeoForschungsZentrum GFZ. http://doi.org/10.1594/GFZ.SDDB.1295

Status

I   N       R   E   V   I   E   W : KTB, WG Geophysics (2010): Electrical Resistivity of Cores of the KTB Pilot Hole VB1. Deutsches GeoForschungsZentrum GFZ. http://doi.org/10.1594/GFZ.SDDB.1295

Abstract

In general, four-electrode devices are used to measure the resistivity on original (unprepared) cores and on mini cores drilled from these original cores. The in-phase and the out-of-phase signal is measured and therefore the complex resistivity is determined. All measurements are performed under surface conditions (room temperature and atmospheric pressure). Four point like electrodes are situated at the core surface along a semicircle in a plane perpendicular to the core axis. The two current electrodes are opposite to each other. The electrodes are in contact to the sample by a porous plastic material soaked with 0.1 molar NaCl solution. Voltage and current is measured by a lock-in-amplifier at 120 Hz frequency. Due to high contact resistances, only the magnitude of complex resistivity is used. By computer controlled rotating of the core and moving of the electrode arrangement along the cores z axis, resistivity as a function of azimuth and length is measured.

Contact

  • Deutsches GeoForschungsZentrum GFZ

Keywords

Date of Sampling, Frequency, Number of analyses/measurements, Resistivity_Max, Resistivity_Mean, Resistivity_Min

GCMD Science Keywords

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      • publisher: Deutsches GeoForschungsZentrum GFZ
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        • description (descriptionType=Abstract): In general, four-electrode devices are used to measure the resistivity on original (unprepared) cores and on mini cores drilled from these original cores. The in-phase and the out-of-phase signal is measured and therefore the complex resistivity is determined. All measurements are performed under surface conditions (room temperature and atmospheric pressure). Four point like electrodes are situated at the core surface along a semicircle in a plane perpendicular to the core axis. The two current electrodes are opposite to each other. The electrodes are in contact to the sample by a porous plastic material soaked with 0.1 molar NaCl solution. Voltage and current is measured by a lock-in-amplifier at 120 Hz frequency. Due to high contact resistances, only the magnitude of complex resistivity is used. By computer controlled rotating of the core and moving of the electrode arrangement along the cores z axis, resistivity as a function of azimuth and length is measured.
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      • Entry_Title: Electrical Resistivity of Cores of the KTB Pilot Hole VB1
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        • Dataset_Title: Electrical Resistivity of Cores of the KTB Pilot Hole VB1
        • Dataset_Release_Date: 2010-09-29
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      • Keyword: Resistivity_Mean
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      • Summary
        • Abstract: In general, four-electrode devices are used to measure the resistivity on original (unprepared) cores and on mini cores drilled from these original cores. The in-phase and the out-of-phase signal is measured and therefore the complex resistivity is determined. All measurements are performed under surface conditions (room temperature and atmospheric pressure). Four point like electrodes are situated at the core surface along a semicircle in a plane perpendicular to the core axis. The two current electrodes are opposite to each other. The electrodes are in contact to the sample by a porous plastic material soaked with 0.1 molar NaCl solution. Voltage and current is measured by a lock-in-amplifier at 120 Hz frequency. Due to high contact resistances, only the magnitude of complex resistivity is used. By computer controlled rotating of the core and moving of the electrode arrangement along the cores z axis, resistivity as a function of azimuth and length is measured.
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    • resource
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      • title: Electrical Resistivity of Cores of the KTB Pilot Hole VB1
      • date: 2010
      • subject: German Continental Deep Drilling Program
      • subject: Land based
      • subject: calculation
      • subject: Date of Sampling
      • subject: Frequency
      • subject: Number of analyses/measurements
      • subject: Resistivity_Max
      • subject: Resistivity_Mean
      • subject: Resistivity_Min
      • identifier: 10.1594/GFZ.SDDB.1295
      • creator: KTB, WG Geophysics
      • description: In general, four-electrode devices are used to measure the resistivity on original (unprepared) cores and on mini cores drilled from these original cores. The in-phase and the out-of-phase signal is measured and therefore the complex resistivity is determined. All measurements are performed under surface conditions (room temperature and atmospheric pressure). Four point like electrodes are situated at the core surface along a semicircle in a plane perpendicular to the core axis. The two current electrodes are opposite to each other. The electrodes are in contact to the sample by a porous plastic material soaked with 0.1 molar NaCl solution. Voltage and current is measured by a lock-in-amplifier at 120 Hz frequency. Due to high contact resistances, only the magnitude of complex resistivity is used. By computer controlled rotating of the core and moving of the electrode arrangement along the cores z axis, resistivity as a function of azimuth and length is measured.

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    License: cc-by