Acoustic polarization measurements of elastic anisotropic properties of metamorphosed rocks along the sec-tion of german ultradeep well สาย
© Kovalevskiy M.V., Gorbatsevich F.F., Khams W., Dahlheim H.A.
The German superdeep borehole KTB drilled in the massif composed of paragneiss, metabasite, granite and metasedimentary
rocks (Germany, Windischeshenbach) reached the maximum depth of 9101 m. Elastic-anisotropic properties of rock samples
from the depth range of 4,1-7,1 km were determined to compile a general velocity section of the massif. Over this depth interval the
rock density is within 2,75-3,33 g/cm3, Vp=6,0÷7,1,
Vs=3,3÷4,0 km/s. Their average values are: ρ=3,0 g/cm3,
Vp=6,7, Vs=3,65 km/s. Having been compared with the
similar data for the upper massif (from the surface down to 4 km depth) these data can be considered to be
common for the entire section. All the samples studied are elastic anisotropic. The phenomena found on the KTB core samples were
previously discovered at the Kola superdeep borehole.