Results 121 to 130 of about 3,183 (164)
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Formation azimuthal anisotropy
The Leading Edge, 1999Since the first wireline log was acquired in 1927 in France, most of the information recorded in wellbores has been representative of changes in formation properties as a function of depth in or near the borehole. The data are one dimensional, with depth being the only variable.
Bert Chenin, Bob Joyce
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Global Azimuthal Anisotropy in the Transition Zone
Science, 2002Surface wave dispersion measurements for Love wave overtones carry evidence of azimuthal anisotropy in the transition zone of Earth's mantle (400 to 660 kilometers deep). A Backus-Gilbert inversion of anisotropic phase velocity maps, with resolution kernels mainly sensitive to the transition zone, shows a robust long-wavelength azimuthally anisotropic ...
Trampert, J., van Heijst, H.J.
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Wide‐azimuth processing for azimuthal anisotropy analysis
SEG Technical Program Expanded Abstracts 2004, 2004Azimuth-friendly data processing is mandatory in a reliable fracture characterisation workflow. Here, the effects of standard processing methodologies in the presence of azimuthal anisotropy are investigated on synthetic and real data examples. Common techniques for signal processing, statics calculations, imaging and velocity analysis are adapted for ...
Cynthia Gomez, Erika Angerer
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The Leading Edge, 2002
Measuring P-wave azimuthal anisotropy has been in the recent past an elusive task; therefore, the interpreter ignored this attribute of the seismic data and left the subject to the research and technology group geophysicists. Conversely, the interpreting geophysicist knew that, when measured, the anisotropy could yield important reservoir properties ...
Marty Williams, Edward Jenner
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Measuring P-wave azimuthal anisotropy has been in the recent past an elusive task; therefore, the interpreter ignored this attribute of the seismic data and left the subject to the research and technology group geophysicists. Conversely, the interpreting geophysicist knew that, when measured, the anisotropy could yield important reservoir properties ...
Marty Williams, Edward Jenner
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Analysis Methodology for Azimuthal Anisotropy
72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010, 2010Here is a prescription for the implementation of a data-driven analysis procedure for determining accurate horizontal anisotropic velocity parameters. The high resolution method is simple and fast and can be quickly applied to 3D surveys. Wide and multiple azimuth datasets are making it clear that azimuthal anisotropy is more prevalent than most ...
K. Bishop, A. Osadchuk, M. Stanley
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Detection of azimuthal anisotropy
SEG Technical Program Expanded Abstracts 1989, 1989The effect of azimuthal anisotropy on conventional P wave data is not a traditional subject for discussion in geophysical conventions. As a considerable number of 3D surveys, most of them involving a wide azimuth range, have been recorded and processed over a number of years, this situation is surprising: whenever accuracy and resolution are required ...
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Variable Azimuthal Anisotropy in Earth's Lowermost Mantle
Science, 2004A persistent reversal in the expected polarity of the initiation of vertically polarized shear waves that graze the D″ layer (the layer at the boundary between the outer core and the lower mantle of Earth) in some regions starts at the arrival time of horizontally polarized shear waves.
Edward J, Garnero +3 more
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Azimuthal anisotropy of scatterometer measurements over land
IEEE Transactions on Geoscience and Remote Sensing, 2006Studies of the Earth's land surface involving scatterometers are becoming an increasingly important application field of microwave remote sensing. Similarly to scatterometer observations of ocean waves, the backscattering coefficient (sigma0) response of land surfaces depends on both the incidence and azimuth angle under which the observations are made.
Zoltan Bartalis +2 more
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Azimuthal Anisotropy and the QGP
AIP Conference Proceedings, 2006Study of azimuthal anisotropy have played very important role at RHIC(Relativistic Heavy Ion Collider) Physics. The large azimuthal anisotropy is the proof of very early thermalization of the system which cannot be obtained without introducing interactions at the partonic level.
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Azimuthal anisotropy: Is it really ubiquitous?
SEG Technical Program Expanded Abstracts 2007, 2007Following the groundbreaking work of Crampin (1985), Alford (1986), Lynn and Thomsen (1990) and Lewis et al (1991), it quickly became conventional wisdom in the industry that substantial shear-wave azimuthal anisotropy is nearly ubiquitous in the subsurface. Crampin and Zatsepin (1995) made theoretical arguments that implied that most of the subsurface
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