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...

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...

High-EffortŽ 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...

Poro-acoustoelasticity FD simulation of elastic wave propagation in prestressed porous media

Haidi Yang, Li-yun Fu

International Meeting for Applied Geoscience and Energy (IMAGE)

...avefield snapshots for different values of uniaxial stress P are shown in Fig. 4. We see that the S, fast-P, and slow-P wavefronts deforme...

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...

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...

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...

3D anisotropic seismic simulation for fracture prediction in Sichuans Wufeng shale gas reservoirs

Xiang Li, Ziduo Hu, Chunhui Xie, Yancan Tian, Wei Liu, Xinyu Fang, Gang Yao

International Meeting for Applied Geoscience and Energy (IMAGE)

.... These snapshots reveal distinct propagation characteristics: in the VTI scenario, wavefronts propagate faster horizontally, while in the HTI media...

Accelerated deep learning-based estimation of wavefront dips and curvatures and their application to 3D prestack data enhancement

Kirill Gadylshin, Ilya Silvestrov, Andrey Bakulin

International Meeting for Applied Geoscience and Energy (IMAGE)

... of normal and normalincidence-point wavefronts at zero offset are used in the common-reflection-surface (CRS) method to produce stacking seismic sections...

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...

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...

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...

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...

5-D Interpolation Compensates for Poor Sampling, by Daniel Trad; #41504 (2014).

Search and Discovery.com

Finite Difference Modelling: Part IV

Lasse Amundsen, Ørjan Pedersen, Martin Landrø

GEO ExPro Magazine

... velocity, the wave originating at the source expands in a series of spherical wavefronts centred on that source; a consequence of Fermat’s principle...

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...

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 ...

An immersed boundary topography approach for TTI acoustic propagation

Edward Caunt, Rhodri Nelson, Tim MacArthur, Fabio Luporini, Gerard Gorman

International Meeting for Applied Geoscience and Energy (IMAGE)

... is a common phenomenon, producing nonspherical radiation patterns, distorting wavefronts, and shifting arrival times. Sequential deposition of sedimentary...

New stability constraints for pseudo-acoustic finite difference TTI modelling and inversion

Rodrigo Fuck, Lorenzo Casasanta, Marcel Nauta

International Meeting for Applied Geoscience and Energy (IMAGE)

... of SV wavefronts computed for homogenous model from parameters for West Africa shale sample E4 reported on Wang (2002) with different σ: 0.56...

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...

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...

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...

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...

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...

Toward elastic free-surface topography with immersed boundaries

Edward Caunt, Rhodri Nelson, Fabio Luporini, Gerard Gorman

International Meeting for Applied Geoscience and Energy (IMAGE)

... isotropy. The immersed free surface yields smooth reflected waves, and wavefronts corresponding to the expected conversions between compressive and shear...