Results 131 to 140 of about 3,183 (164)

A robust workflow for detecting azimuthal anisotropy

SEG Technical Program Expanded Abstracts 2011, 2011
Summary The prestack analysis of amplitude variation with offset/angle (AVO/AVA) has been a useful hydrocarbon exploration tool for a number of years. As this technology matured, forward modeling became an important tool to understand the seismic response, to ensure acquisition parameters were adequate for its detection, and to calibrate and validate ...
Michael Davidson, Herbert Swan, Samik Sil, Jack Howell, Robert Olson, Changxi Zhou   +5 more
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Azimuth-dependent reflection anisotropy spectroscopy

Journal of Applied Physics, 2003
A detailed explanation of “azimuth dependent reflection anisotropy spectroscopy” (ADRAS) [B. F. Macdonald and R. J. Cole, Appl. Phys. Lett. 80, 3527 (2002)] is presented. Experimental data and simulations are used to illustrate the greater information content of ADRAS compared to the standard reflection anisotropy technique. The application of ADRAS to
B. F. Macdonald, J. S. Law, R. J. Cole
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Azimuth anisotropy prediction and correction of wide-azimuth seismic data

Interpretation
Abstract For seismic wave propagation in media with horizontal transverse isotropy (HTI), kinematic and dynamic attributes are anisotropic. P waves propagate slower in perpendicular to fracture azimuth than parallel to it, whereas reflection strength and frequency vary with azimuth. The azimuthal effects on reflection coefficients and
Liyan Zhang, Ang Li, Nianxu Xi
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Characteristics of Azimuthal Anisotropy in Narrow-Azimuth Marine Streamer Data

68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006, 2006
Towed-streamer acquisition samples a narrow range of azimuths. We discuss the resulting sensitivity of such data to azimuthal velocity anisotropy. Correction for such effects, for example by using a residual moveout correction before migration, can significantly improve the imaging in such situations.
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Statistical moments for azimuthal anisotropy characterization

SEG Technical Program Expanded Abstracts 2014, 2014
The benefits of separating azimuthal AVO into AVO (Amplitude Versus Offset) and AVAz (Amplitude Versus Azimuth) have been demonstrated using Fourier Coefficients. The main advantage is to avoid coupling between the isotropic and anisotropic properties estimates.
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MAZ Depth-Velocity Modelling and Imaging with Azimuthal Anisotropy

PGCE 2010, 2010
Processing of multi and wide-azimuth seismic data faces some new challenges, and one of them is depth-velocity modelling and imaging with azimuthal velocity anisotropy. Analysis of multi-azimuth data very often reveals noticeable fluctuations in moveout between different acquisition directions.
Sergey Birdus, Erika Angerer, Iftikhar Abbasi   +2 more
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Azimuthal Anisotropy in Marine Streamer Data

2nd EAGE St Petersburg International Conference and Exhibition on Geosciences, 2006
Towed-streamer acquisition samples a narrow range of azimuths. We discuss the resulting sensitivity of such data to azimuthal velocity anisotropy. Correction for such effects, using either a residual moveout correction before migration or incorporating the anisotropy within the migration step itself, can significantly improve the imaging of the data.
G. Williams, R.J. Wombell
openaire   +1 more source

Azimuthal Misalignment and Surface Anisotropy as Sources of Error in Ellipsometry

Applied Optics, 1970
In employing ellipsometry to determine the complex refractive index of a reflecting surface, a small systematic error in the zero-angle positions of the polarizers is shown under certain circumstances to have a large effect on the values of the optical constants calculated. The effect of superficial optical anisotropy on ellipsometry in general, and on
M J, Dignam, M, Moskovits
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Direct photon spectra and azimuthal anisotropy

Nuclear and Particle Physics Proceedings, 2016
The transverse momentum distribution and azimuthal anisotropy of direct photon production in Au+Au collisions at sNN=200 GeV were measured in the PHENIX experiment at RHIC. Through the external conversion method, earlier yield and v2 measurements were extended down to pT = 0.4 GeV/c.
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Azimuthal Anisotropy Results from STAR

Nuclear Physics A, 2013
Abstract Recent advances in the studies of eventwise azimuthal anisotropy from STAR have been made possible by the high statistics 200 GeV Au + Au datasets taken in 2010 and by the broad range of energies recorded during the first phase of the RHIC beam energy scan.
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