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The AAPG/Datapages Combined Publications Database
Showing 71 Results. Searched 195,354 documents.
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1990
Multifocusing Stack Technique for Subsurface Imaging, #40749 (2011)
Sunjay Sunjay,
Search and Discovery.com
... in the conventional CMP stacking. Analytical expressions (based on the spherical representation of wavefronts) describe the moveout correction...
2011
G. Non-Normal Incidence Reflections and the Determination of Lithology - Use of Shear Waves and Amplitude with Offset
Norman S. Neidell
AAPG Special Volumes
... not enough energy in the system to accomplish this. Hence, by bending raypaths (refracting) and wit different modes of motion (shear and compression...
1987
Abstract: Prestack Signal Enhancement by Non-hyperbolic MultiFocusing; #90187 (2014)
Evgeny Landa, Alex Berkovitch, and Kostya Deev
Search and Discovery.com
... angle of the normal ray β and the radii of curvature Rcre and Rcee of the two fundamental wavefronts, namely, normal incident point and normal waves...
2014
Exact kinematic behavior of the P-SV converted wave in a vertical transversely isotropic medium
Guillaume Cambois
International Meeting for Applied Geoscience and Energy (IMAGE)
... 𝜃0 = Figure 1: qP and qSv wavefronts for the Greenhorn Shale (Thomsen and Dellinger, 2003): γ0 = 2.05, ε = 0.256 and δ = –0.05. The qP phase angle...
2023
Know Before You Go!
Lars Zühlsdorff, Trond Haugland
GEO ExPro Magazine
... words, wavefronts rather than rays are propagated through the model, which is much closer to what is happening in the field (and much more efficient...
2021
Abstract: Spectral-element Simulations of Elastic Wave Propagation in Exploration and Geotechnical Applications; #90187 (2014)
Lin Zheng, Qi Zhao, Qinya Liu, Bernd Milkereit, and Giovanni Grasselli
Search and Discovery.com
... for all simulations are shown on the right panels with wavefronts identified and labeled. The effects of water layer and the salt-dome geometry are clearly...
2014
Abstracts: Application of CSP Gather Modeling for Determination of Velocity Smoothing Operator for Prestack Kirchhoff Depth Migration; #90173 (2015)
Hassan Khaniani and John C. Bancroft
Search and Discovery.com
... wavefronts initiated from the scatter point for times of 0.3s, 0.6s and 0.9s are computed. After applying a band pass filter by frequencies of 0 Hz...
2015
High-Effort Seismic Acquisition: Improving Image Detail; #41568 (2015)
David C. Henley, Kevin Hall, Henry Bland, Eric Gallant, Gary Margrave, Malcolm Bertram
Search and Discovery.com
... provided by horizontally summed geophone arrays whose antenna pattern preferentially admits vertically travelling reflection wavefronts, rather than non...
2015
The Array Sonic .... A New Technique for Acoustic Measurements
A. James
Indonesian Petroleum Association
... part causes wavefronts which develop in the formation. A typical waveform is shown in Fig. 2. Figure 2. Array sonic waveforms Two wavefronts...
1989
Seismic Exploration Using Shear Waves
R. Garotta
Indonesian Petroleum Association
... paths are not exactly perpendicular to the wavefronts. But it gives an idea of the anisotropy in the layer. Fig. 17 Figure 17. "S" Wavefront The same...
1978
An acoustic wave equation with the gradients of velocity and density
Jianyong Bai, Orhan Yilmaz
International Meeting for Applied Geoscience and Energy (IMAGE)
...flectivity caused by the velocity impact the wavefields and synthetic data both in amplitude and in phase. For example, the wavefronts indicated by the red...
2023
EXTENDED ABSTRACT: From Isotropic to Tilted Transverse Isotropic Pre-Stack Depth Migration
Nicolas Chazalnoel
GCAGS Transactions
... seismic data with higher accuracy. For anisotropic medium, the seismic wavefronts travel with different velocities in different directions. The so-called...
2011
Application of VTI PSDM for imaging carbonate structures
Seyed Yaser Moussavi Alashloo, Deva Ghosh, Yasir Bashir, Amir Babasafari
Geological Society of Malaysia (GSM)
..., the comparison of traveltime contours shows that the anisotropic wavefronts for area with strong anisotropy Figure 2: (a) L1 velocity model, and (b) A few...
2018
III. Processing For Preservation of Seismic Amplitudes
Norman S. Neidell
AAPG Special Volumes
... are, of course, a natural consequence of spreading wavefronts and would occur whether or not reflecting interfaces or velocity gradients were present...
1979
Abstracts: Microseismic Event Models from Finite-differencing with Corrections; #90173 (2015)
Peter M. Manning
Search and Discovery.com
... in Figure 4 shows the wavefronts which have propagated from a source at the left plot edge, and in the centre of the narrow low velocity zone across...
2015
5-D Interpolation Compensates for Poor Sampling, by Daniel Trad; #41504 (2014).
Search and Discovery.com
2014
Angle-constrained VSP least-squares reverse-time migration based on a high-efficiency stabilized Poynting vector
Xuan Ke, Mauricio Sacchi, Ying Shi
International Meeting for Applied Geoscience and Energy (IMAGE)
...ned at 1.5 km in the horizontal direction. The receiver wavefield generates two wavefronts, propagating towards both sides of the borehole, as observed ...
2023
Past and Present-Day Coastal Changes between Kuala Sungai Besar and Kuala Besar, Kelantan Darul Naim
J. K. Raj, Ismail Yusoff, Wan Hasiah Abdullah
Geological Society of Malaysia (GSM)
... and Kuala Besar; this recession due to a northwest directed littoral drift that results from the oblique approach of wavefronts from the South China Sea...
2007
Star: Shallow Time Anomaly Replacement
Michael O. Marcoux, Lee Lu
Southeast Asia Petroleum Exploration Society (SEAPEX)
... of source-detector pairs. By the reciprocity principle, the wavefronts observed are the same that would be recorded if the A-detector was replaced...
1982
Reading Between the Lines
Steve Harries
GEO ExPro Magazine
... downgoing depths enhances the low-frequency content and can increase the wavefronts derived from the Nessie-6 multisensor streamer signal-to-ambient-noise...
2012
Abstract: Multi-trace Acoustic-impedance Inversion with Transform-domain Sparsity Promotion; #90174 (2014)
Sanyi Yuan, Shangxu Wang, Ning Tu, and Xiang Li
Search and Discovery.com
... or models that are smooth except for discontinuities/wavefronts along piece-wise smooth curves. In this paper, we propose a multi-trace acoustic...
2014
Net Directions and Rates of Present-Day Beach Sediment Transport by Littoral Drift along the East Coast of Peninsular Malaysia
J. K. Raj
Geological Society of Malaysia (GSM)
.... This oblique approach leads to a net transport of beach sediment parallel to shorelines, as a result of sediment transport perpendicular to wavefronts...
1982
Magnetotelluric inversion using supervised learning trained with random smooth geoelectric models
Lian Liu, Bo Yang, Yixian Xu, Dikun Yang
International Meeting for Applied Geoscience and Energy (IMAGE)
...), and picking up the first arrivals of the seismic wavefronts (Ross et al. 2018; Zhu & Beroza 2018). In the meantime, many geophysicists explored the inversion...
2023
Broad bandwidths reveal double the expected sediment depth in the Northern Carnarvon Basin
Jo Firth, Mark Stanley
Petroleum Exploration Society of Australia (PESA)
... and therefore delivers unfocused ghost wavefronts, enabling attenuation of the ghosts by designature. The designature process requires the use of an accurate far...
2016
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