Abstract: The Phase Shift Time Stepping Equation and the Marmousi Data Set; #90171 (2013)

Ben D. Wards, Gary F. Margrave, and Michael P. Lamoureux

Search and Discovery.com

...) with 13 reference velocities. Figure 3: Left: Model of an overhung saltdome. Middle: Poststack migration using 3 linear velocity windows. Right: Poststack...

Full Waveform Inversion for Complex Near-Surface Imaging Using SEG SEAM II Synthetic Model; #42322 (2018)

Ali A. Mohamed, Abdullatif A. Al-Shuhail

Search and Discovery.com

... Manually-picked velocity model Depth (km) 0- 1- 2- (a) Depth (km) 0- 1- 2- (a) (b) RTM using initial velocity model before SWI Manual...

Abstract: Trace Interpolation and Elevation Statics by Conjugate Gradients; #90172 (2014)

Marcus Wilson, Robert J. Ferguson

Search and Discovery.com

... is computed using an assumed velocity model and the wavefield at depth is derived using weighted damped least squares. This method is used to correct common...

2D Seismic Refraction Tomography Survey on Metasediment at a Proposed Development Site in Dengkil, Selangor

Umar Hamzah, Abd Rahim Samsudin

Geological Society of Malaysia (GSM)

..., and sandy silt with gravel. The figure also shows the SPT values of the borehole as well as velocity depth function from a seismic survey carried out near...

Abstract: DREAM™ - Drilling and Real Time Migration: A New Method for the Geophysical Monitoring of Wells

Luca Bertelli, Luca Savini, and Luca Aleotti

Houston Geological Society Bulletin

... Analysis) that calculates, using linear and non-linear regression techniques, the new velocity profile. This new velocity information is added...

Enhancing PSDM via Well Data Derived from Gradient Boosted Trees Machine Learning

Marianne Rauch, Mike Perz, Sathiya Namasivayam, Ritesh Sharma

Unconventional Resources Technology Conference (URTEC)

... method using measured sonic logs were compared with the results when using a machine-predicted velocity field. Log prediction method and results Deep...

Abstract: Optimum Aperture Length for Improving Dispersion Curve Analysis in CMP Cross-Correlation of Surface Waves; #90187 (2014)

Roohollah Askari, Robert J. Ferguson, and Helen Isaac

Search and Discovery.com

... is the calculated phase velocity. Using the above equation, we try to optimize a model using the method of Conjugate Gradient (Zeidouni, 2011). We calculate...

Numerical Solution to Design Velocity Strings to Unload Wet Gas Wells for Optimum Flow Rate and Recovery

Bernando Purba, Awaldi Fitrah

Indonesian Petroleum Association

... production is decreases. The simulation shows that there are correlations among comparison of actual tubing and velocity string size, depth and velocity...

Abstract: Constrained 3D VTI Full Waveform Inversion of Wide Azimuth Data from the Red Sea, Saudi Arabia; #90254 (2016)

Young Seo Kim, Constantine Tsingas

Search and Discovery.com

... velocity fields by employing an optimization approach. This methodology is based on the minimization of an objective function between the recorded data...

Subsurface Characterizaton Using Microseismic Velocity, Attenuation, and Ansiotrophy Tomography in a Geothermal Field

Ahmad Syahputra, Andri Dian Nugraha, Rachmat Sule, Sri Widiyantoro

Indonesian Petroleum Association

... function. Figure 3 - Horizontal slice of 3-D tomogram at depth 1 km near top reservoir. There are six tomograms; pertubation velocity of P-wave...

Automatic Seismic-to-Well Tie by Restricted Adjustment of Sonic Logs; #42466 (2021)

Gabriel R. Gelpi, Daniel O. Pérez, Danilo R. Velis

Search and Discovery.com

... to a new synthetic trace that has a higher correlation with the observed data. The function is built using monotonic cubic splines interpolation...

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

... for the near surface. We compute the traveltimes associated with all shot and receiver locations by ray tracing using the initial velocity depth model...

Seismic Velocity Variations in San Joaquin Valley, California

Walter S. Olson

AAPG Bulletin

..., and the linear increase of interval velocity with depth. Both equations may be fitted to data by using least squares. These equations give the simplest...

A Time Migration Before Stack

Richard Cooper, Malcolm Hobson

Geological Society of Malaysia (GSM)

... a more accurate velocity field for migration and depth conversion. The robust nature of the method allows its application to routine data processing...

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...

Abstract: Inexact Full Newton Method for Full Waveform Inversion Using Simultaneous Encoded Sources; #90187 (2014)

Amsalu Y. Anagaw and Mauricio D. Sacchi

Search and Discovery.com

... with depth used as starting model for inversion (b). (c) and (d) are reconstructed velocity model using simultaneous sources with 15 and 9 super-shots...

Measuring Behind Casing Water Flow

T. M. Williams

Indonesian Petroleum Association

... of the detector 1 to detector 2 count rates is an exponential function of the water velocity only. The linear water velocity is determined from...

Well Log Prediction Using Machine Learning

Sundeep Sharma

Oklahoma City Geological Society

... log will be referred to as the target data and the input logs will be referred to as feature data. By using multi-linear regression algorithm...

Wave and Bottom Sediment Interactions over a Submerged Sand Bank during the Winter Cold-Front Season, Western Louisiana

Daijiro Kobashi, Felix Jose, Gregory Stone

GCAGS Transactions

.... The relationship between shear velocity (U*) and turbidity (OBS) with linear regression line (left) and hypothetical parabolas with arbitrary "a" values...

Integration of Depth Conversion, Seismic Inversoin and Modeling Over The Belida Field, South Natuna Sea Block "B", Indonesia

Patrick Jonklaas

Indonesian Petroleum Association

.... Figure 5. Depth versus average velocity plot at the Lower Arang revealing a non-linear time depth function. Various time to depth conversion...

Velocity Analyses of Near Seafloor Strata Based on Multichannel Seismic Data from the Tonga Platform

Jeffrey E. Cole, Dennis M. Mann

Circum Pacific Council Publications

... and subsequent sorting into CDP gathers. An initial, or brute, stack was created for each line by applying an assumed subsurface velocity function...

Chapter 10-part 3: 3-D Depth Image Interpretation

William L. Abriel, Joseph P. Stefani, Robert D. Shank, David C. Bartel

AAPG Special Volumes

.... One very important concept that needs to be understood is the sensitivity of seismic imaging to variations in overlying earth velocity, and why depth...

Advanced CRS Application by Model Based Attribute Guidance

Search and Discovery.com

Long-Offset Approximations to NMO Function for a Layered Subsurface

E. Blias

Search and Discovery.com

.... For long offsets (offset/depth § 1.5 – 2.5), we can expect significant improvement of VRMS estimation using three-term velocity analysis, even though...

Long-Offset Approximations to NMO Function for a Layered Subsurface

E. Blias

Search and Discovery.com

.... For long offsets (offset/depth § 1.5 – 2.5), we can expect significant improvement of VRMS estimation using three-term velocity analysis, even though...