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The AAPG/Datapages Combined Publications Database

Showing 71 Results. Searched 195,354 documents.

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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-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...

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

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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