Articles | Volume 29
Technical development
26 Apr 2021
Technical development |  | 26 Apr 2021

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

Jochem Kück, Marco Groh, Martin Töpfer, Andreas Jurczyk, and Ulrich Harms

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COSC-2 – drilling the basal décollement and underlying margin of palaeocontinent Baltica in the Paleozoic Caledonide Orogen of Scandinavia
Henning Lorenz, Jan-Erik Rosberg, Christopher Juhlin, Iwona Klonowska, Rodolphe Lescoutre, George Westmeijer, Bjarne S. G. Almqvist, Mark Anderson, Stefan Bertilsson, Mark Dopson, Jens Kallmeyer, Jochem Kück, Oliver Lehnert, Luca Menegon, Christophe Pascal, Simon Rejkjær, and Nick N. W. Roberts
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Correlation of core and downhole seismic velocities in high-pressure metamorphic rocks: a case study for the COSC-1 borehole, Sweden
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Cited articles

Abbott, M. B. and Rodbell, D. T.: Stratigraphic correlation and splice generation for sediments recovered from a large-lake drilling project: an example from Lake Junín, Peru, J. Paleolimnol., 63, 83–100,, 2020. 
Almqvist, B., Brander, L., Giese, R. Harms, U., Juhlin, C., Lindén, C., Lorenz, H., and Rosberg, J.: I-EDDA test center for core-drilling and downhole investigations, EGU General Assembly 2018, 8–13 April 2018, Vienna, Austria, Geophysical Research Abstracts, 20, EGU2018-14837, 2018. 
Baumgarten, H. and Wonik, T.: Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications, Int. J. Earth Sci., 104, 1639–1654,, 2015. 
Beal, J.: Tight oil vertical log analysis applied to horizontal Logging While Tripping (LWT) data of Cretaceous-aged Viking formation, Saskatchewan, Canada: a multi-disciplinary review of initial and extended findings, AAPG Rocky Mountain Section Meeting, Cheyenne, WY, USA, 2019. 
Short summary
New cable-free borehole memory sondes allow measurements in boreholes with very unstable walls, which is common, e.g., in soft sediments below lakes. The drill-pipe-mounted memory sondes can pass through narrowed zones. While being pulled up by the drill pipes, they measure natural radioactivity, velocity of sound, electrical conductivity, magnetizability, and the temperature of the borehole rocks. We describe the memory sondes and appendant depth devices, both tested in thorough field tests.