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...

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...

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

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 ...

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...

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...

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...

Abstract: 2D Depth Velocity Analysis without Tomography; #90187 (2014)

J. Patrick Butler and Randy Kolesar

Search and Discovery.com

... as epsilon changes A static shift is being used to correct moveout. Reflector 1 Reflector 2 Reflector 3 3 reflectors Bedding direction Raypaths vel...

Abstract: Raypath-Consistent Shear Wave Statics; #90224 (2015)

Raul Cova, David Henley, and Kris Innanen

Search and Discovery.com

... on the assumption of nearly-vertical raypaths through the LVL responsible for statics. However, the low velocity of S-waves magnifies the delays...

Data Enhancement from a 486-Channel Streamer

Bill Dragoset, Ken Larner

Pacific Section of AAPG

.... To preserve that detail, however, the time delays used in the beam-steering must be tailored to align the array effectively with the arriving wavefronts...

High-resolution Measurements of Elasticity at Core Scale. Improving Mechanical Earth Model Calibration at the Vaca Muerta Formation.

Anton Padin, Gilles Pijaudier-Cabot, Alain Lejay, Hamid Pourpak, Jean-Philippe Mathieu, Atef Onaisi, Gregory Boitnott, Laurent Louis

Unconventional Resources Technology Conference (URTEC)

... velocity gage (Naik et al., 2003; Trtnik et al., 2009) measuring the transit time of the P- and S-wavefronts generated by a piezoelectric transducer...

Australian Insights into Streamer Technology Innovations

Andrew Long

Petroleum Exploration Society of Australia (PESA)

...-/eve! source array (lower) decoup!es the primary and ghost source wavefronts. The ghost source wavefront is no longer parallel to the sea-surface...

Limitations on Resolution of Seismic Reflections and Geologic Detail Derivable from Them: Section 1. Fundamentals of Stratigraphic Interpretation of Seismic Data

Robert E. Sheriff

AAPG Special Volumes

... as this point of view is, it is more realistic to think in terms of a wavefront, the location of the disturbance resulting from a source. Wavefronts...

Advances in Geophysical Techniques for the Detection of Drilling Hazards and Their Application to Seismic Exploration

D. C. N. Pratt, Tong Pow Mun

Southeast Asia Petroleum Exploration Society (SEAPEX)

..., noise, spherical spreading, emergence angles, reflector curvature, spherical wavefronts, transmission co-efficients, inelastic attenuation...