Estimation of stress-dependent anisotropy from P-wave measurements on a spherical sample

0363147 - GLÚ 2012 RIV US eng J - Journal Article
Nadri, D. - Bóna, A. - Brajanovski, M. - Lokajíček, Tomáš
Estimation of stress-dependent anisotropy from P-wave measurements on a spherical sample.
Geophysics. Roč. 76, č. 3 (2011), WA91-WA100. ISSN 0016-8033. E-ISSN 1942-2156
Institutional research plan: CEZ:AV0Z30130516
Keywords : P-wave elastic anisotropy * high confining stress * Thomsen anisotropy
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.418, year: 2011

Stress-dependent seismic anisotropy of the overburden shale in an oil field was studied. The dependency of P-wave velocity, a, on pressure has exponential and linear components, which can be contributed to the compliant and stiff porosities. It was found that Thomsen anisotropy parameters  and  decrease exponentially with pressure and possibly reach to the intrinsic anisotropy of the clay minerals at 400 MPa.
Permanent Link: http://hdl.handle.net/11104/0199210