Elastic anisotropy and pore space geometry of schlieren
granite: direct 3-D measurements at high confining pressure
combined with microfabric analysis

J 2013

Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis

STANĚK, Martin, Yves GERAUD, Ondřej LEXA, Petr ŠPAČEK, Stanislav ULRICH et. al.

Základní údaje

Originální název

Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis

Autoři

STANĚK, Martin (203 Česká republika), Yves GERAUD (250 Francie), Ondřej LEXA (203 Česká republika), Petr ŠPAČEK (203 Česká republika, garant, domácí), Stanislav ULRICH (36 Austrálie) a Marc DIRAISON (250 Francie)

Vydání

Geophysical Journal International, OXFORD, OXFORD UNIV PRESS, 2013, 0956-540X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 2.724

Kód RIV

RIV/00216224:14310/13:00072499

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1093/gji/ggt053

UT WoS

000320462300027

Klíčová slova anglicky

Magnetic fabrics and anisotropy; Microstructures; Seismic anisotropy; Fractures and faults

Štítky

AKR, rivok

Změněno: 3. 4. 2014 16:35, Ing. Andrea Mikešková

Anotace

V originále

Pore space geometry of granitic rocks and its evolution with depth are key factors in large-scale seismics or in projects of enhanced geothermal systems or of deep hazardous waste repositories. In this study, we studied macroscopically anisotropic schlieren-bearing granite by experimental P-wave velocity (V-P) measurements on spherical sample in 132 directions at seven different confining pressures in the range 0.1-400 MPa. In order to discriminate the phenomena affecting the rock elastic properties we analysed the orientation of microcracks and of grain boundaries and we measured the anisotropy of magnetic susceptibility of the rock. Three sets of microcracks were defined, with two of them linked to the massif exfoliation process and one to cooling contraction of the massif. During pressurization the measured mean V-P and V-P anisotropy degree at ambient pressure and at highest confinement (400 MPa) yielded 3.3 km s(-1) and 24 per cent, and 6.2 km s(-1) and 3 per cent, respectively. The associated V-P anisotropy pattern was transversely isotropic and governed by the schlieren, with a minimum V-P direction perpendicular to them and a girdle of high V-P directions parallel to them. The highest change in V-P was observed between 0.1 and 10 MPa, suggesting a significant closure of porosity below depths of 500 m. Change of the V-P anisotropy pattern to orthorhombic together with increase of mean V-P and V-P anisotropy degree during depressurization was attributed to inelastic response of one of the sets of microcracks to the loading-unloading cycle.

Citovat

STANĚK, Martin, Yves GERAUD, Ondřej LEXA, Petr ŠPAČEK, Stanislav ULRICH a Marc DIRAISON. Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis. Geophysical Journal International. OXFORD: OXFORD UNIV PRESS, 2013, roč. 194, č. 1, s. 383-394. ISSN 0956-540X. Dostupné z: https://dx.doi.org/10.1093/gji/ggt053.

@article{1168324,
   author = {Staněk, Martin and Geraud, Yves and Lexa, Ondřej and Špaček, Petr and Ulrich, Stanislav and Diraison, Marc},
   article_location = {OXFORD},
   article_number = {1},
   doi = {http://dx.doi.org/10.1093/gji/ggt053},
   keywords = {Magnetic fabrics and anisotropy; Microstructures; Seismic anisotropy; Fractures and faults},
   language = {eng},
   issn = {0956-540X},
   journal = {Geophysical Journal International},
   title = {Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis},
   volume = {194},
   year = {2013}
}

TY  - JOUR
ID  - 1168324
AU  - Staněk, Martin - Geraud, Yves - Lexa, Ondřej - Špaček, Petr - Ulrich, Stanislav - Diraison, Marc
PY  - 2013
TI  - Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis
JF  - Geophysical Journal International
VL  - 194
IS  - 1
SP  - 383-394
EP  - 383-394
PB  - OXFORD UNIV PRESS
SN  - 0956540X
KW  - Magnetic fabrics and anisotropy
KW  - Microstructures
KW  - Seismic anisotropy
KW  - Fractures and faults
N2  - Pore space geometry of granitic rocks and its evolution with depth are key factors in large-scale seismics or in projects of enhanced geothermal systems or of deep hazardous waste repositories. In this study, we studied macroscopically anisotropic schlieren-bearing granite by experimental P-wave velocity (V-P) measurements on spherical sample in 132 directions at seven different confining pressures in the range 0.1-400 MPa. In order to discriminate the phenomena affecting the rock elastic properties we analysed the orientation of microcracks and of grain boundaries and we measured the anisotropy of magnetic susceptibility of the rock. Three sets of microcracks were defined, with two of them linked to the massif exfoliation process and one to cooling contraction of the massif. During pressurization the measured mean V-P and V-P anisotropy degree at ambient pressure and at highest confinement (400 MPa) yielded 3.3 km s(-1) and 24 per cent, and 6.2 km s(-1) and 3 per cent, respectively. The associated V-P anisotropy pattern was transversely isotropic and governed by the schlieren, with a minimum V-P direction perpendicular to them and a girdle of high V-P directions parallel to them. The highest change in V-P was observed between 0.1 and 10 MPa, suggesting a significant closure of porosity below depths of 500 m. Change of the V-P anisotropy pattern to orthorhombic together with increase of mean V-P and V-P anisotropy degree during depressurization was attributed to inelastic response of one of the sets of microcracks to the loading-unloading cycle.
ER  -

STANĚK, Martin, Yves GERAUD, Ondřej LEXA, Petr ŠPAČEK, Stanislav ULRICH a Marc DIRAISON. Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis. \textit{Geophysical Journal International}. OXFORD: OXFORD UNIV PRESS, 2013, roč.~194, č.~1, s.~383-394. ISSN~0956-540X. Dostupné z: https://dx.doi.org/10.1093/gji/ggt053.

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