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Elastic anisotropy of core samples from the Taiwan Chelungpu Fault Drilling Project (TCDP): direct 3-D measurements and weak anisotropy approximations
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SYSNO ASEP 0369989 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Elastic anisotropy of core samples from the Taiwan Chelungpu Fault Drilling Project (TCDP): direct 3-D measurements and weak anisotropy approximations Author(s) Louis, L. (FR)
David, Ch. (FR)
Špaček, Petr (GFU-E) RID
Wong, T. (US)
Fortin, J. (FR)
Song, S. R. (TW)Source Title Geophysical Journal International - ISSN 0956-540X
Roč. 188, č. 1 (2012), s. 239-252Number of pages 14 s. Language eng - English Country GB - United Kingdom Keywords microstructures ; seismic anisotropy ; acoustic properties Subject RIV DC - Siesmology, Volcanology, Earth Structure CEZ AV0Z30120515 - GFU-E (2005-2011) UT WOS 000298586000016 DOI 10.1111/j.1365-246X.2011.05247.x Annotation The study of seismic anisotropy has become a powerful tool to decipher rock physics attributes in reservoirs or in complex tectonic settings. We compare direct 3-D measurements of P-wave velocity in 132 different directions on spherical rock samples to the prediction of the approximate model proposed by Louis et al. based on a tensorial approach. The data set includes measurements on dry spheres under confining pressure ranging from 5 to 200 MPa for three sandstones retrieved at a depth of 850, 1365 and 1394 metres in TCDP hole A (Taiwan Chelungpu Fault Drilling Project). As long as the P-wave velocity anisotropy is weak, we show that the predictions of the approximate model are in good agreement with the measurements. As the tensorial method is designed to work with cylindrical samples cored in three orthogonal directions, a significant gain both in the number of measurements involved and in sample preparation is achieved compared to measurements on spheres. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2012
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