Articles | Volume 29
Sci. Dril., 29, 39–48, 2021
https://doi.org/10.5194/sd-29-39-2021
Sci. Dril., 29, 39–48, 2021
https://doi.org/10.5194/sd-29-39-2021
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 et al.

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Location/Setting: Instrumentation and observatories | Subject: Geophysics/Seismology | Geoprocesses: Earth science methods
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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, https://doi.org/10.1007/s10933-019-00098-w, 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, https://doi.org/10.1007/s00531-014-1082-x, 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. 
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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.