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The AAPG/Datapages Combined Publications Database

Showing 879 Results. Searched 191,010 documents.

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First-Arrival Traveltime Inversion in the CMP Domain: Method and Application

Search and Discovery.com

... the relationship between them. In the case of a linear increase in velocity with depth, the turning ray turns at the point of maximum depth...

2013

AAPG Memoir 76, Chapter 18: Velocity Estimation for Pore-Pressure Prediction

David W. Bell

AAPG Special Volumes

..., the common assumption that the logarithm of velocity is linear in depth is not consistent with check shot data. A single, definitive relationship...

2001

Abstract: Seismic Imaging of Imbricate Structures in Mountainous Area: Case Studies; #90211 (2015)

Nanxun Dai, Oz Yilmaz, Weizhong Wang, and Jie Zhang

Search and Discovery.com

... by nonlinear traveltime tomography that accounts for topography, and resolves lateral and vertical velocity variations. (2) Several different strategies...

2015

Abstract: Non-First-Break Solution for Shallow Velocity Anomaly Problem; #90211 (2015)

Emil Blias

Search and Discovery.com

...-density automatic non-hyperbolic NMO picking, (ii) Analytical NMO inversion to estimate shallow velocity structure, (iii) Non-linear horizonbased traveltime...

2015

Application of finite difference eikonal solver for traveltime computation in forward modeling and migration

Amir Mustaqim Majdi, Seyed Yaser Moussavi Alashloo, Nik Nur Anis Amalina Nik Mohd Hassan, Abdul Rahim Md Arshad, Abdul Halim Abdul Latiff

Geological Society of Malaysia (GSM)

.... The migration process can be done for pre-stack or post-stack, 2D or 3D data in time or depth domain. A velocity field is needed as the input for the migration...

2021

Abstract: Application of a Tomographic Velocity Model to the Prestack Depth Migration of a Buried Valley; #90172 (2014)

Oluwafemi Ogunsuyi, Douglas R. Schmitt

Search and Discovery.com

... of a tomographic velocity model, the reprocessing of the reflection seismic and its corresponding depth migration using velocities derived from the traveltime...

2014

Non-First-Break Solution for Shallow Velocity Anomaly Problem; #41602 (2015)

Emil Blias

Search and Discovery.com

... to estimate shallow velocity structure, (iii) Non-linear horizon based traveltime tomography to improve depth velocity model and (iv) time-dependent velocity...

2015

Abstract: Regular Grids Travel Time Calculation … A Practical Huygens Wavefront Expansion Approach; #90187 (2014)

Zhengsheng Yao, Mike Galbraith, and Randy Kolesar

Search and Discovery.com

...transform, ( ( and ⃗⃗ ⃗ ) ) ( ( ) ) (5) (6) we can obtain the calculation of traveltime on grids in Cartesian x-y coordinates. For instance, if the variation...

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

... preserving Kirchhoff migration: a traveltime based strategy: Stud. geophys. geod., 46, 193−211 Gray, S., 2000, Velocity smoothing for depth migration...

2015

Abstracts: Near-surface Velocity Model Building and Statics in Permafrost Regions; #90173 (2015)

Tianfei Zhu, Yan Yan, and Jon Downton

Search and Discovery.com

.... Each of these refraction branches is described by a linear traveltime segment, and only slopes and intercepts of these traveltime segments are used...

2015

Checkshots and Vertical Seismic Profiles: Part 7. Geophysical methods

B. A. Hardage

AAPG Special Volumes

... by the velocity in that interval. That time adjustment is then added to the measured traveltime to each receiver. If the depth datum is below the shot depth...

1992

Abstracts: Converted Wave Processing in the EOM Domain; #90173 (2015)

Thais A. Guirigay and John B. Bancroft

Search and Discovery.com

... be redefined as: . (8) From the equation (8), he varies with the trace geometry hs, and hr, but also varies with depth velocity Vc(zo), as Vp can also...

2015

Velocity and Velocity

M. Al-Chalabi

Petroleum Exploration Society of Australia (PESA)

.... Nonuniqueness of velocity-depth combinations that satisfy the traveltime data. 5. Subjectivity in flatness of events in CMP/CRP gathers and in other...

2000

Application of Fullwaveform Tomography to VSP Walkaway Data

Eric Takam Takougang, Youcef Bouzidi

Petroleum Exploration Society of Australia (PESA)

... obtained after forward modelling using the current velocity, density and/or attenuation models. Unlike other imaging techniques such as traveltime...

2016

Abstract: To TTI or not to TTI? Semi-Automated 3D Tomographic Velocity Analysis in the Canadian Foothills: A Case History; #90211 (2015)

Sylvestre Charles, David Mitchell, Rob Holt, Jiwu Lin, and John Mathewson

Search and Discovery.com

... study, we evaluate how velocity model building strategy affects imaging in the Canadian Foothills Thrust Belt. Two depth imaging processing techniques...

2015

High-Resolution Anisotropic Earth Model Building on Conventional Seismic Data Using Full-Waveform Inversion: an Offshore Australia Case Study

Bee Jik Lim, Denes Vigh, Stephen Alwon, Saeeda Hydal, Martin Bayly, Chris Manuel, Dimitri Chagalov, Gary Hampson, Dimitri Bevc

Indonesian Petroleum Association

..., the initial starting model was derived from a smooth version of a reflection traveltime tomography velocity field derived from a depth migration workflow...

2014

Abstract: Migrating Reflections from the Moho Using a Refraction Velocity Model … An Example from the Slave Craton, NWT; #90211 (2015)

Joaquin Aristimuno and Claire Samson

Search and Discovery.com

... a detailed velocity model of the lower crust and upper mantle. A new 2D velocity model under the SNORCLE profile has been deri ved from traveltime...

2015

Abstracts: Locating Microseismicity in Three-Dimensionally Heterogeneous Reservoirs; #90173 (2015)

Adam M. Baig, Ted Urbancic, Margaret Seibel, Vladimir Shumila

Search and Discovery.com

... by lithological tops interpreted from seismic cross-sections. Figure 2: A depth view of wavefronts (blue curves) and traveltime field (blue-yellow contours...

2015

Abstract: Interpretation of Natural Fractures from the Traveltime Variation with Source-receiver Azimuth in the Alberta Foothills; #90172 (2014)

Draga A. Talinga, Don C. Lawton

Search and Discovery.com

... determined from dip and strike event traveltime differences are in general similar to the models determined from the velocity ellipse. In addition, the cross...

2014

Abstract: Combining Geology and Prestack Seismic for Structural Model Building in the Gaspé Belt (Québec, Canada); #90211 (2015)

Anne Jardin, Martin Bêche, Karine Broto, Dave Saucier, and Donna Kirkwood

Search and Discovery.com

..., and of advanced pre-stack seismic techniques like pre-stack seismic interpretation, traveltime inversion and depth migration, can improve...

2015

ABSTRACT: Multi Focusing Stack Technique for Subsurface Imaging; #90118 (2011)

Sunjay Sunjay

Search and Discovery.com

... that facilitates the estimation of a velocity model for depth imaging. For these reasons, improving the quality of time imaging is a focus of intensive...

2011

Abstracts: Improved Near-surface Velocity Models from 2D Waveform Tomography of Vibroseis First-arrival Data; #90173 (2015)

Brendan R. Smithyman and Ronald M. Clowes

Search and Discovery.com

... volcanic rocks of the study area. Introduction Interpreted near-surface velocity models are presented from inversion of first-arrival traveltime...

2015

Abstract: Monitoring Active Steam Injection through Time-lapse Seismic Refraction Surveys; #90174 (2014)

Byron M. Kelly and Don C. Lawton

Search and Discovery.com

... to that of 4D reflection profiles. Through reciprocal traveltime analysis, refraction profiles can delineate significant time-shifts within a monitor survey due...

2014

Influence of Lithology and Neogene Uplift on Seismic Velocities in Denmark: Implications for Depth Conversion of Maps

Peter Japsen

AAPG Bulletin

... from seismic maps, when velocity information is available from several wells. Velocity is the key in the conversion from seismic traveltime to depth...

1993

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