Abstract: 3D Time Domain Full Waveform Inversion Based on Multiscale Adapted Variable Grid Method Case Study Majunga Basin East African Coast; #91204 (2023)

Mukiibi Ssewannyaga Ivan, Jian-Ping Huang, Zi-Ying Wang, Jidong Yang, Jin Keji

Search and Discovery.com

... velocity with depth, which not only simulated wavefields with higher accuracy but also accelerated the calculation during the implementation of FWI. Our...

Application of Advanced Depth Imaging Technology in Shallow Water Offshore Indonesia

Michael Gidding, Suyang Chen, Steven Wiseman, Moch Asrori, Richard Bolton

Indonesian Petroleum Association

... gradients.Grid based tomography is a robust, 3D ray-based inversion method used to refine velocity models for depth migration. Residual traveltime errors...

Long-Offset Approximations to NMO Function for a Layered Subsurface

E. Blias

Search and Discovery.com

.../depth ratio. Conventional velocity analysis uses hyperbolic approximation for the reflection traveltimes: t( x) 2 T02  x 2 VRMS (1) Here T0...

Long-Offset Approximations to NMO Function for a Layered Subsurface

E. Blias

Search and Discovery.com

.../depth ratio. Conventional velocity analysis uses hyperbolic approximation for the reflection traveltimes: t( x) 2 T02  x 2 VRMS (1) Here T0...

Abstracts: The Conventional and Non-conventional Seismic Differencing; #90173 (2015)

Vanja Vracar and Robert J. Ferguson

Search and Discovery.com

... modelling Stoffa et al. (1990) introduce the SSF migration algorithm, which handles lateral changes in velocity at each depth level taking dipping...

Joint 4D full-waveform inversion using enhanced template-matching objective function

Gaurav Dutta, Emmanuel Saragoussi, Xin Cheng, Markos Sourial, Yongbo Zhai, Chirag Parekh, Denes Vigh

International Meeting for Applied Geoscience and Energy (IMAGE)

... of the 4D difference got distorted after alignment. Figure 4: (a) 4D RTM image using a common velocity model and without any alignment. (b) Calculated depth...

Forensic GPR anti-human landmine accurate detection by Gramian constrained joint inversion of the monostatic reflection and transmission radargrams

Jide Nosakare Ogunbo, Changsoo Shin, Sang-Wook Kim, Sang-Hyun Kim

International Meeting for Applied Geoscience and Energy (IMAGE)

... seismogram is available in Ogunbo (2022), and it is straightforwardly adapted to model the GPR radargram. Velocity profiles by the inversion of the reflection...

Pattern Recognition in a Digital Age: A Gameboard Approach to Determining Petrophysical Parameters; #40929 (2012)

Daniel A. Krygowski and Robert M. Cluff

Search and Discovery.com

..., 1967) in linear and logarithmic scales, constitute a unified pattern recognition display. This “gameboard” presentation in Excel (©Microsoft) presents...

Key Technologies for Processing of Seismic Data in Gas Cloud Area

Search and Discovery.com

Abstract: Navigating through the Red Sea Subsalt Structures: A Look-Ahead VSP Case Study from Saudi Arabia; #90319 (2018)

Ali A. Aldawood, Carlos Planchart

Search and Discovery.com

... a Zero-Offset Vertical Seismic Profile (ZVSP) survey, one can obtain a 1D time-depth profile at the well location. This velocity model can...

FWI derived reflectivity gathers in angle domain

Hu Jin, Simon Luo, Qingqing Liao, Xukai Shen, Ganyuan Xia, Madhav Vyas

International Meeting for Applied Geoscience and Energy (IMAGE)

... sparse angle gathers to generate angle-dependent FWI gradients and uses a single step length to obtain angle-dependent velocity model updates from those...

Revealing the discontinuities by 3D prestack diffraction separation and imaging

Chuangjian Li, Suping Peng, Xiaoqin Cui, Peng Lin

International Meeting for Applied Geoscience and Energy (IMAGE)

.... obtain the NMO velocity by the velocity analysis process; 2. calculate the corresponding midpoint and zero-offset traveltime of the sample point...

Streamlining subsurface insights: Single extrapolation for holistic Green's function generation

Hongwei Liu

International Meeting for Applied Geoscience and Energy (IMAGE)

... of migration velocity models. Traditionally, prestack depth migration (PSDM) based on ray-tracing-based Kirchhoff integration is predominantly employed...

Abstract: Seismic Imaging of the SW South China Sea Deep Crustal Structure shows Evidence for a Ductile Lower Crust during Rifting; #90236 (2015)

M. Delescluse, T. Pichot, N. Chamot-Rooke, M. Pubellier, Y. Qiu, G. Sun, J. Wang, and J.-L. Auxietre

Search and Discovery.com

.... A traveltime tomography inversion was first performed to obtain a 2-D velocity model of the crustal and upper mantle structures (Figure 2). Ray coverage...

Application of VTI PSDM for imaging carbonate structures

Seyed Yaser Moussavi Alashloo, Deva Ghosh, Yasir Bashir, Amir Babasafari

Geological Society of Malaysia (GSM)

... into prestack depth imaging. The general workflow for Kirchhoff PSDM is illustrated in Fig. 1 which in this study, a new algorithm for traveltime computing...

Estimation of anisotropic parameters from semblance picking using dynamic programming

Hong Liang, Houzhu (James) Zhang, Dongliang Zhang, Hongwei Liu, Xu Ji

International Meeting for Applied Geoscience and Energy (IMAGE)

... velocity can be converted to interval velocity, which is used as the initial model for depth-domain model building (Ferla and Cibin, 2010). We can follow...

Characterizing the Near Surface with VSP and Well Logs

Search and Discovery.com

... was calibrated. As shown in Figure 2c, the sonic traveltime becomes longer than VSP traveltime with increasing depth. Although sonic times are often expected...

Azimuthal Velocity Analysis of 3-D Pre-Stack Seismic Data for Fracture-Induced Anisotropy in the Altamont-Bluebell Field

Khaled Al Dulaijan, Gary Margrave

Unconventional Resources Technology Conference (URTEC)

...ffset two-way traveltime, x is the offset, ܸ௙௔௦௧ and ܸ௦௟௢௪ are the fast and slow NMO velocities respectively, ߚ௦ is the azimuth of the slow NMO velocity...

Wide-Angle Seismic-Reflection and -Refraction Data from the Solomon Islands

A. K. Cooper, R. A. Wood

Circum Pacific Council Publications

.../s are seen as distinct linear segments, separated by sharp breaks in slope, that indicate dis­ tinct subsurface velocity boundaries. At higher velo...

Resolution limits of fluid overpressures from mineralogy, porosity, and sonic velocity variations in North Sea mudrocks

Christian Hermanrud, and Oddgeir Undertun

AAPG Bulletin

..., observed deviations from reference velocity versus depth trends are converted to pore pressure changes with little or incomplete analyses of potential...

Chapter 14: Gravity, Seismic Reflection, and Tomographic Constraints on the Subduction-to-Strike-Slip Transition at the Southeastern Caribbean Plate Boundary Zone

Tricia G. Alvarez, Paul Mann, Carlos A. Vargas, Lesli J. Wood

AAPG Special Volumes

... Research, v. 102, p. 3211–3214. Nakajima, J., and A. Hasegawa, 2006, Anomalous low-velocity zone and linear alignment of seismicity along...

Joint inversion of magnetotelluric and seismic travel time data with intelligent interpretation of geophysical models

Hongyu Zhou, Rui Guo, Maokun Li, Fan Yang, Shengheng Xu, Zuzhi Hu, Deqiang Tao

International Meeting for Applied Geoscience and Energy (IMAGE)

..., 1200-1600m and 1600-2000m, respectively. The resistivity and velocity of layers increase with depth. One or two anomalies are known to be located...

Abstract: Prestack Signal Enhancement by Non-hyperbolic MultiFocusing; #90187 (2014)

Evgeny Landa, Alex Berkovitch, and Kostya Deev

Search and Discovery.com

... of observation geometry, near surface velocity and 5 unknown parameters:,  s ,  r , R s , Rr , L . COMF traveltime formulas provide an adequate...

Time-Lapse Imaging of a Hydraulic Stimulation Using 4-D Vertical Seismic Profiles and Fiber Optics in the Midland Basin

Robert Meek, Kevin Woller, Mark George, Robert Hull, Hector Bello, Jed Wagner

Unconventional Resources Technology Conference (URTEC)

... migration. The depth migration used an isotropic eikonal traveltime solution calculated from a single velocity function derived from the zero-offset direct...

Elastic FWI for large impedance contrasts

Zedong Wu, Zhiyuan Wei, Zhigang Zhang, Jiawei Mei, Rongxin Huang, Ping Wang

International Meeting for Applied Geoscience and Energy (IMAGE)

... contrasts such as salt, despite its presently taken acoustic assumption. This has resulted in a leap in salt velocity model building over...