Record details

Title
    Elastic anisotropy of core samples from the Taiwan Chelungpu Fault Drilling Project (TCDP): direct 3-D measurements and weak anisotropy approximations
Author
    David, Ch.
    Fortin, J.
    Louis, L.
    Song, S. R.
    Špaček, Petr
    Wong, T.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 188, č. 1
Pages
    s. 239-252
Year
    2012
Notes
    Rozsah: 14 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    acoustic properties
    microstructures
    seismic anisotropy
Keyword
    3-D
    Anisotropy
    Approximations
    Chelungpu
    Core
    Direct
    Drilling
    Elastic
    Fault
    Measurements
    Project
    Samples
    Taiwan
    TCDP
    Weak
Abstract (in english)
   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.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013