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Keywords: symmetry
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583981
... and fractured medium the vertical electric field have higher total amplitudes inside the layer, the magnetic field in the top and inside it, and the horizontal electric field does in the top and above it, so, a receiver in the top of the formation could be advantageous; fourth, independently of the symmetry...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427199
... important for considerations related to field development and production. A fractured reservoir may have multiple vertical fracture sets and, as a result, the rock’s elastic symmetry may be monoclinic. Thus, AVAz inversions based on reflectivity equations associated with higher symmetries will not be valid...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428438
... with orthorhombic symmetry. Regional stress direction may change with depth or fracture sets may be non-aligned with the regional stress direction, so it is of interest to simulate offset- and azimuth- dependent reflection amplitudes in a 1D layered model with orthorhombic properties and a symmetry axis direction...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3423931
... to the spectral signature of the passive sources. This information is represented by two latent codes produced by our encoder. The novelty that enables SymAE to achieve this separation lies with the physical symmetries that are directly embedded into the architectural design of the encoder. These symmetries...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216245
... geological scenarios. Such accuracy depends on the correctness of the anisotropic velocity model and on the numerical method for computing traveltimes. This work describes a new high-order fast-sweeping eikonal solver for q-SV waves in 3D TI media with emphasis on media with a vertical axis of symmetry. We...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2990967
... ABSTRACT The time symmetry of the wave equation enables application of time-reversal modeling in acoustic and elastic media. Time reversal represents a key component not just in reverse-time migration (RTM), but also in source localization using passive seismic (e.g., microseismic) data...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13864149
.... The layers share a common horizontal plane of symmetry but the orientations of the vertical (orthogonal) planes of Symmetry are different. Note that although each layer is considered orthorhombic, the corresponding global effective model has lower symmetry (e.g., monoclinic, with a horizontal plane...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13880506
..., it would be possible to exploit more from waveforms for the other parameters such as the tilt of the axis of symmetry of transversely isotropic medium or the order of anisotropy, etc. We conduct numerical experiments using a 3D Hamiltonian particle method under a hypothesis that the cross dipole waveforms...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13861385
... plays, orthorhombic (ORT) symmetry is a realistic model for fractured/stressed media. Unfractured reservoirs and, in particular, shale can be approximated as a transversely isotropic media with vertical axis of symmetry (VTI). Adding vertical fractures to a VTI background rock results in orthorhombic...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13577602
... were estimated from two orthogonal walkaway VSP lines; the difference in value was found to be zero, whereas the difference in is approximately 6%. These differences indicate that the area shows weak anisotropy and that the symmetry is not perfect vertical transverse isotropy (VTI). Introduction...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-11557865
... & gas azimuth seg seg international exposition orientation fault enhancement annual meeting symmetry fault pattern annual international meeting Admasu , F. , S. Back , and K. Toennies , 2006 , Autotracking of faults on 3d seismic data : Geophysics , 71 , no. 6...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5750144
... (transversely isotropic with a vertical symmetry axis) formations, azimuthal anisotropy commonly expected for hydraulically fractured shales makes the slowness vectors deviate from a plane, arrange themselves into nonzero solid-angle apertures, and yield theoretically unique inverse problems for seismic moment...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5902954
... be written in a matrix/vector form: poisson isotropic model fracture density calculation perpendicular moduli orthorhombic media reservoir geomechanics anisotropic stress log analysis upstream oil & gas fracture anisotropy symmetry horizontal well ij component equation...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5850450
... this formalism to a stack of layers with orthorhombic (ORT) symmetry in order to study the behavior of surface seismic processing parameters. We consider two cases: stack composed of layers with orthorhombic symmetry including azimuthally rotated layers and a stack of vertically fractured layers with intrinsic...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5872678
... Summary Stressed, fractured rocks can have complex symmetry. Understanding the compaction and burial history of a basin can be used to better build complex models based on geological concepts and numerical modeling. In this example, we show how 3D stress modeling through basin evolution...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0767
... performing anisotropic orthotropic subsurface characterization. A field example is given within the context of reservoir properties estimation in orthotropic media. symmetry practical consideration vti constraint media inversion orthotropic avaz inversion covariance information upstream oil...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1585
... Summary Significant azimuthal velocity variation in seismic data has been observed as suggested in HTI model by Thomsen (1986). We built four artificial samples using thin lucite (Cast Acrylic) plates to simulate different fracture sets with HTI symmetry, and investigate their elastic...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0379
.... Recent advances in seismic azimuthal analysis of media with orthotropic symmetry (an orthotropic medium has three orthogonal planes of mirror symmetry), and quantitative interpretation workflows, are illustrated using high-resolution prestack seismic inversion in an unconventional play in the Williston...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0034
... perforation shot variation orientation tight gas field geophone array seg houston 2013 geophone reservoir characterization annual international meeting calibration sensor orientation symmetry azimuth upstream oil & gas anisotropy The influence of HTI anisotropy on microseismic event...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1080
... upstream oil & gas equation reservoir characterization seg houston 2013 anisotropy correction anisotropic rock symmetry apparent isotropic parameter geophysics thomsen expression university anisotropic formation isotropic parameter On the use of isotropic parameters , E, , K...

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