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The AAPG/Datapages Combined Publications Database
Showing 944 Results. Searched 195,364 documents.
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
Model of Near-Surface Velocity, Southern San Joaquin Valley, California, by James G. Ferry; #91024 (1989)
Search and Discovery.com
1989
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
Diving wave tomography: Velocity modelling using first arrival traveltime
Amatul Syafi Abdul Basit, Abdul Rahim Md Arshad, Arulini Permalu
Geological Society of Malaysia (GSM)
... with velocity are the push-down and pull-up effect caused by the discrepancy between recorded traveltime and the actual depth of the structure. It often...
2022
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
Eikonal equation-based adjoint-state characteristic reflection traveltime tomography: Method and application in real dataset
Jianming Zhang, Liangguo Dong, Jianhua Wang, Yilin Wang, Chao Huang
International Meeting for Applied Geoscience and Energy (IMAGE)
.... Introduction Macro-velocity model building is a core issue in seismic data processing. The computational efficiency of adjoint-state traveltime...
2023
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
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
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
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
Wave equation traveltime Kirchhoff with real data applications
Hu Jin, Vladimir Bashkardin, Petr Jilek, Chandan Kumar, Han Liu, John Etgen, Madhav Vyas, Ganyuan Xia
International Meeting for Applied Geoscience and Energy (IMAGE)
... for the traveltime calculation are comparable in quality. We see slight depth shifts in the WETK images that used 4Hz waves for calculating the traveltimes...
2023
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: Reflection-based Traveltime Inversion Using Segment Dynamic Image Warping; #91204 (2023)
Lu Liu
Search and Discovery.com
... reconstructs long-wavelength components of the velocity model and achieves a satisfactory depth-domain image for interpreting the geological structures...
2023
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