caa a22 4500 475827961 CHVBK 20180406123834.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s005310050309 doi (NATIONALLICENCE)springer-10.1007/s005310050309 Aligned fractures in carbonate rocks: laboratory and in situ measurements of seismic anisotropy [Elektronische Daten] [S. Dey-Barsukov, H. Dürrast, W. Rabbel, S. Siegesmund, S. Wende] By vertical seismic profiling and shear wave analysis we show that a packet of carbonate reservoir rocks, found at nearly 3000 m depth in the North German Basin, is seismically anisotropic. For vertical paths of wave propagation the estimated velocity difference of the split shear waves is 10%. No shear wave birefrigence is observed within the hangingwall which, therefore, has to be regarded as isotropic or transversely isotropic. Additional laboratory investigations of the petrography of drilled carbonate samples and of their seismic velocities show that the anisotropy is most probably caused by subvertical fractures with preferred azimuthal orientation. The strike direction of the aligned fractures determined by analysis of split shear waves is approximately N55°E. This value agrees with recently published directions of maximum horizontal tectonic stress in pre-Zechstein sediments in the eastern part of the North German Basin, but it is in contrast to the world stress map. Springer-Verlag Berlin Heidelberg, 2000 Key words Aligned fractures nationallicence Seismic anisotropy nationallicence Seismic shear waves nationallicence Shear wave splitting nationallicence Vertical seismic profiling nationallicence Carbonate reservoir rocks nationallicence North German Basin nationallicence Dey-Barsukov S. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut Dürrast H. Institut für Geologie und Dynamik der Lithosphäre, Universität Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany, DE aut Rabbel W. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut Siegesmund S. Institut für Geologie und Dynamik der Lithosphäre, Universität Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany, DE aut Wende S. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut https://doi.org/10.1007/s005310050309 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310050309 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dey-Barsukov S. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut NATIONALLICENCE 700 1- Dürrast H. Institut für Geologie und Dynamik der Lithosphäre, Universität Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany, DE aut NATIONALLICENCE 700 1- Rabbel W. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut NATIONALLICENCE 700 1- Siegesmund S. Institut für Geologie und Dynamik der Lithosphäre, Universität Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany, DE aut NATIONALLICENCE 700 1- Wende S. Institut für Geowissenschaften, Universität Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany e-mail: wrabbel@geophysik.uni-kiel.de, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer