Seismic first arrival tomography for top salt velocity update: A case study in the Santos Basin, Brazil

Paulo H. B. Alves, Marco Cetale, Roger M. Moreira, Sérgio L. E. F. da Silva, Jorge Lopez

International Meeting for Applied Geoscience and Energy (IMAGE)

... alleviate depth-velocity ambiguity compared to conventional two-way time tomography. Conversely, Zelt and Barton (1998) underscore the importance...

Current Trends in Geophysics

H. E. Stommel, J. M. Graul

Indonesian Petroleum Association

... of in this connection, wave equation processing is by no means limited to this important concept. Improved velocity estimates, stacking procedures, coherency...

A New Approach to Shale Compaction and Stratigraphic Restoration, Beaufort-Mackenzie Basin and Mackenzie Corridor, Northern Canada (1)

D. R. ISSLER

AAPG Bulletin

... plots (Figures 7-11). Depending on the data distribution, porosity-depth curves were calculated by linear regression using the linear equation, phi...

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...

Data selection for velocity model estimation using a circular shot OBN survey

Felipe T. Costa, Sergio L. E. F. da Silva, Ammir A. Karsou, Felipe Capuzzo, Roger M. Moreira, Jorge Lopez, Marco Cetale

International Meeting for Applied Geoscience and Energy (IMAGE)

... construction and eikonal equation in automatic pre-stack data selection can improve the velocity model estimation in full waveform inversion (FWI...

Standard Interpretation: Part 4. Wireline Methods

Mark Alberty

AAPG Special Volumes

... minerals. Method The two most frequently used methods of estimating shale volume from the gamma ray log are the linear and the nonlinear estimators...

Seismic Modeling and Imaging - Making Waves, by Phillip Bording and Larry Lines, #40066

Search and Discovery.com

Wave scattering by the formation velocity perturbation surrounding a fluid-filled borehole

Zhou-Tuo Wei

International Meeting for Applied Geoscience and Energy (IMAGE)

.... Figure 1: Geometry of scattered ray caused from acoustic velocity disturbance in a near-borehole formation. (a) The actual borehole source-receiver...

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

Christian Hermanrud, and Oddgeir Undertun

AAPG Bulletin

.... The yellow line is the average velocity versus depth trend from the data of Figure 5 (computed from equation 2). This trend thus shows the average...

The impact of estimated temporal and spatial variability of water layer velocity on the correction of OBS data

Peter Scholtz, Truong Nguyen, Arash Jafar Gandomi

International Meeting for Applied Geoscience and Energy (IMAGE)

... depth-dependent ones. The velocity profile estimation method described by Bekara et al. (2021) applies a seconddegree polynomial approximation to model...

Wave-equation based amplitude versus offset inversion in long time windows, with time-variant wavelets

Dries Gisolf, Peter R. Haffinger

International Meeting for Applied Geoscience and Energy (IMAGE)

..., or horizontal slowness, by ray-tracing through a stratified overburden velocity model. Once the horizontal slownesses are known, the migrated image...

Seismic Static Corrections, Don W. Steeples and Gregory S. Baker, Search and Discovery Article #40047 (2002)

Search and Discovery.com

Land FWI in the Sultanate of Oman: Challenges and advances on the road to high-resolution velocity

Mohammad Sheryar Farooqui, Yonghe Guo, Azza Al Hasni

International Meeting for Applied Geoscience and Energy (IMAGE)

...., 2021). MWI uses surface and refracted waves traveling through the near surface to retrieve Vp and Vs velocity information. The penetration depth...

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...

Relation between dips of prestack time migrated and unmigrated data

Jagmeet Singh

International Meeting for Applied Geoscience and Energy (IMAGE)

... the correctness of the migration velocity model and revise velocities in an easy to determine direction (increase or decrease). A handy formula...

Resolving DAS versus geophone discrepancies using the DAS transform: A comparative study from the CaMI CCS field research station, Alberta

Ali Sayed, Robert R. Stewart, Marie Macquet, Don Lawton

International Meeting for Applied Geoscience and Energy (IMAGE)

.... DSR data were scaled by the apparent velocity (𝑐 𝑎𝑝𝑝 ) using equation 2 in the f-k domain (Figure 2b). The scaling factors were capped at 8000 m...

On the connection between WRI and FWI: Analysis of the nonlinear term in the Hessian matrix

Ali Gholami, Hossein S. Aghamiry, Stephane Operto

International Meeting for Applied Geoscience and Energy (IMAGE)

... superimposed concrete structures of velocity 4000 m/s (Figure 3a). The dimensions of the model are 15 m in distance and 3 m in depth, and the grid spacing...

Seismic Velocity Dispersion and the Petrophysical Properties of Porous Media

Search and Discovery.com

... the model fitting for the velocity dispersion data observed in the uncorrelated vibrator sweep received at the depth 1085 m. Compared with the linear...

Estimate near-surface velocity with reversals using deep learning and full-waveform inversion

Yong Ma, Xu Ji, Weiguang He, Tong Fei

International Meeting for Applied Geoscience and Energy (IMAGE)

..., such as turning-ray tomography or first-arrival tomography (Zhu et al., 1992) cannot resolve the near-surface velocity reversals. ReLU Dense layer LSTM Time...

Velocity Model Building Using Tilted Orthorhombic Depth Imaging for Full Azimuth Seismic Data

Yunfeng (Fred) Li, Qiaofeng Wu, Chuen-Song Chen

GCAGS Journal

...Velocity Model Building Using Tilted Orthorhombic Depth Imaging for Full Azimuth Seismic Data Yunfeng (Fred) Li, Qiaofeng Wu, Chuen-Song Chen...

A Practical Model for Organic Richness from Porosity and Resistivity Logs

Q. R. PASSEY , S. CREANEY , J. B. KULLA , F. J. MORETTI , and J. D. STROUD

AAPG Bulletin

... (slow velocity) and a high gamma-ray intensity. Even though the derived I-x parameter has been shown in some wells to correlate roughly linearly...

Burial Diagenesis of Illite/Smectite, a Kinetic Model: ABSTRACT

D. G. McCubbin, J. W. Patton

AAPG Bulletin

...-linear increase in temperature with time. For each of several wells where we had complete data, we solved this equation for values of activation energy...

Elastic wave reverse-time migration with dynamic focused beams for weak anisotropic media

Ning Qin

International Meeting for Applied Geoscience and Energy (IMAGE)

... wave solution of dynamic ray tracing equation, respectively. According to the principle of reciprocity, the propagation matrix from point P...

Abstract: Subsalt Seismic Modeling and Illumination Analysis in Red Sea Transition Zone; #90254 (2016)

Ewenet Gashawbeza, Hongwei Liu, Saleh AL-Saleh

Search and Discovery.com

... velocity field, acquisition geometry, and a high fidelity algorithm. In this study, two modeling techniques were used: (1) ray-based that is fast...

Regularization for full-waveform inversion by generative diffusion model with score distillation

Bingbing Sun

International Meeting for Applied Geoscience and Energy (IMAGE)

... subsurface properties, including velocity, density, and anisotropy. Contrary to traditional methods that depend on approximations (like the ray-based...