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The AAPG/Datapages Combined Publications Database
Showing 947 Results. Searched 195,372 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
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
Model of Near-Surface Velocity, Southern San Joaquin Valley, California, by James G. Ferry; #91024 (1989)
Search and Discovery.com
1989
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: Reflection Full Traveltime Inversion in the Image Domain; #90319 (2018)
Yue Ma, Tong W. Fei, Yan Wu, Yi Luo
Search and Discovery.com
... accurate velocity model from traveltime information. Many previously published wave equation-based methods, which attempt to automatically invert traveltime...
2018
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: Tomographic Reflected-Wave FWI Using Time Lag; #90254 (2016)
Geoff Clark, Yilong Qin
Search and Discovery.com
...-velocity anomaly. So velocity model from ray-based traveltime tomography might not be reliable to be used for RTM or serve as a starting model for FWI...
2016
Near Surface Imaging using Joint Seismic Gravity Inversion
Teguh Suroso, Boko Nurdiyanto, Trilaksita B. Nugraha, Lita Novitasari, Heri Winarto
Indonesian Petroleum Association
... traveltime and gravity data as inputs and minimizes an overall objective function in a single inversion run to obtain near surface velocity and density...
2019
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: 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
Abstract: Near-Surface Velocity Estimation Using Source-Domain Full Traveltime Inversion and Waveform Inversion; #90319 (2018)
Lu Liu, Bowen Guo, Yi Luo
Search and Discovery.com
...Abstract: Near-Surface Velocity Estimation Using Source-Domain Full Traveltime Inversion and Waveform Inversion; #90319 (2018) Lu Liu, Bowen Guo, Yi...
2018
Abstract: First-Arrival TomoStatics and Residual Statics for Near-Surface Corrections; #90211 (2015)
Jie Zhang, Oz Yilmaz, and Nanxun Dai
Search and Discovery.com
... roles. For processing land data from mountainous areas, using the first-arrival traveltime tomography approach to resolve the near-surface structures...
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: Seismic Velocity Models for Heat Zones in Athabasca Tar Sands, by L. R. Lines, J. D. Covey; #91003 (1990).
Search and Discovery.com
1990
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
Abstract: Wavefront Picking for 3D Tomography and Full-Waveform Inversion; #90319 (2018)
Abdullah A. Theyab
Search and Discovery.com
... controling (QC) seismic firstbreak traveltime picks is critical for a successful tomographic inversion and maturation of a reliable near surface solutions...
2018
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: Near Surface Imaging by Joint Traveltime and Q-Factor Inversion; #90319 (2018)
Aldo Vesnaver, Pier Paolo Bruno, Rongzhi Lin, Jinyeob Na
Search and Discovery.com
...Abstract: Near Surface Imaging by Joint Traveltime and Q-Factor Inversion; #90319 (2018) Aldo Vesnaver, Pier Paolo Bruno, Rongzhi Lin, Jinyeob Na...
2018
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
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