OSG performed borehole seismic with its 17-level SlimWave borehole geophone chain in the 2276 m deep COSC-2A borehole of the COSC drilling project. The chain was the borehole component of the overall large seismic experiment inside and around the COSC-2A performed by OSG, GFZ Potsdam, Technical University Bergakademie Freiberg, Germany, University of Kiel, Germany, and University of Uppsala, Sweden. 

This is the 3^rd OSG logging campaign at the COSC project.

COSC-2, Järpen, Sweden     2021-SEP & OCT   2-2276 m 

Tools:      SlimWave geophone chain, 17 levels on CW7000           

Staff:      Groh, Kück, Töpfer; Giese, Jaksch, Jurczyk, Krüger

The hole conditions did not cause any problems. A new design, in which the top sheave is mounted between two 20-foot containers instead of requiring a crane, was successfully used for the first time.

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