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The AAPG/Datapages Combined Publications Database
Showing 1,097 Results. Searched 200,293 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
Finite-frequency transmission traveltime tomography in VTI media
Fei Luo, Lanlan Yan, Jiexiong Cai
International Meeting for Applied Geoscience and Energy (IMAGE)
... traveltime). Therefore, the linear relationship between monochromatic traveltime perturbation and model perturbation can be constructed by Rytov approximation...
2024
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: 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
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
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
3-D High-Resolution Reservoir Characterization from Crosswell Seismic Data
John Washbourne, Kenneth Bube
West Texas Geological Society
... to regularized traveltime velocity inversion, and finally show results from two fully 3-D datasets that demonstrate the specific improvements of a consistent...
1998
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
Joint inversion of first-break and early-arrival wave for near surface imaging
Yiming Pan, Kai Zhang, Yipeng Xu, Hailin Wang, Ping Jiang
International Meeting for Applied Geoscience and Energy (IMAGE)
... elevation, the development of lowvelocity zones, and high-velocity anomalies near the surface. Conventional methods based on first-arrival traveltime...
2024
Time-lapse crosswell seismic monitoring of CO2 injection at the Nagaoka CCS site using elastic full-waveform inversion
Rie Nakata, Nori Nakata, Aaron Girard, Masaru Ichikawa, Ayato Kato, David Lumley, Zique Xue
International Meeting for Applied Geoscience and Energy (IMAGE)
... inversion velocity models show much detailed structures than previous traveltime based models and do not contain artefacts evident in acoustic full waveform...
2022
Traveltime tomography and efficient physics-informed Bayesian inversion
Tian Qiao, George Turkiyah, Gerard T. Schuster
International Meeting for Applied Geoscience and Energy (IMAGE)
... after a linear moveout correction, and c) velocity profile (dark solid lines) estimated by damped least squares inversion. The width of the gray zone...
2022
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
A new double-difference earthquake relocation algorithm for models with complex velocity structure
Xinding Fang, Siwei Li, Zhixiang Zhang, Tianrun Chen, Yingcai Zheng
International Meeting for Applied Geoscience and Energy (IMAGE)
... relocation method that does not require the calculation of traveltime gradient and thus is applicable to models with complex velocity structure. Our results...
2024
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
Application of wave-equation reflection traveltime inversion to the Liwan deep-water streamer data in the South China Sea
Yilin Wang, Liangguo Dong, Chao Huang, Jianming Zhang, Yuzhu Liu
International Meeting for Applied Geoscience and Energy (IMAGE)
... structures and utilize seismic reflection traveltime information to establish deep subsurface velocity models. Thus, we apply wave-equation reflection...
2024
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