Electrical Resistivity of Mini Cores (Plugs) of the KTB Main Hole HB1a


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). Mini cores of 25.4 mm diameter and approximately 50 mm length are drilled from original cores. Anisotropy information is obtained by different core orientations. The complex resitivity is measured in an 4-electrode elctrolytic cell by use of a lock-in-amplifier. The applied frequency ranges from 0.5 Hz to 120 kHz. The samples are first evacuated and back-saturated with destilled water. In this case, mainly sigmas and sigmam contribute to the rock resistivity. A second cycle of evacuating and back-saturating with 0.1 molar NaCl solution leads to sigmav (Rauen 1994).

DOI https://doi.org/10.1594/GFZ.SDDB.1312
Metadata Access http://doidb.wdc-terra.org/oaip/oai?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:doidb.wdc-terra.org:981
Creator KTB, WG Geophysics
Publisher Deutsches GeoForschungsZentrum GFZ
Publication Year 2010
OpenAccess true
Contact www.icdp-online.org/contact
Language English
Resource Type Dataset
Discipline Scientific drilling
Spatial Coverage (12.192 LON, 49.588 LAT)