Tomography Techniques Applied to Near Surface Velocity Models in Complex Areas of Colombia

Jorge Monsegny, Saúl Guevara

Asociación Colombiana de Geólogos y Geofisicos del Petróleo (ACGGP)

... or the tomogram. Due to a lower ray density, linear methods do not define the velocity contrast in this zone. Zhang inversion defines better...

Application of Wave Equation Tomography in Frontier Areas

Tien-when Lo, Guy W. Purnell

Indonesian Petroleum Association

... from prestack focusing velocity analysis and prestack depth migration. Both wave equation tomography and prestack focusing velocity analysis suggest...

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...

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)

... is reciprocal to velocity. Ray and finite difference among known methods used to solve the eikonal equation (Kraaijpoel, 2003). Ray tracing method Ray...

EXTENDED ABSTRACT: Applications of Wave Imaging Technologies to Improve Deep Gulf Prospecting

Morgan P. Brown, Joseph H. Higginbotham, Cosmin Macesanu, Oscar E. Ramirez

GCAGS Transactions

... section in the Gulf Coast normally exhibits a simple, depth-variable velocity profile, and prestack time migration (PSTM) methods generally produce...

Abstract: Method for Analysis and Display of Elastic Synthetic Shot Gathers, by K. H. Wrolstad, F. Aminzadeh, and C. K. von Kahrs; #90992 (1993).

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Abstract: Evaluation of the Potential of Wave Equation Depth Imaging Technologies on Land, by Morgan P.Brown and Joseph H. Higginbotham; #90076 (2008)

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Application of Visco-Acoustic Full Waveform Inversion to Shallow-Water, Shallow-Gas Data, #41802 (2016).

Xin Cheng, Ronan Petton, Ian Anstey, Wai-Leong Lai, Denes Vigh, Gavin Menzel-Jones

Search and Discovery.com

... different constant-Q models. Figure 2. Comparison of (top) depth slice overlay of the initial velocity model, and (bottom) Q-FWI derived velocity...

Imaging of Fractures and Faults inside Granite Basement Using Controlled Beam Migration (Geophysics Paper 5)

Don Pham, Jason Sun, James Sun, Qingbing Tang, Graeme Bone, Nguyen Truong Giang

Geological Society of Malaysia (GSM)

... in imaging technology and velocity model building tools, we reprocessed the same data through prestack depth migration, and achieved significant...

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...

How to Make Velocity Corrections

John W. Daly

AAPG Bulletin

... assumes a linear increase in instantaneous velocity with depth the ray paths are circular. This is one of the more common assumptions used by up-to-date...

Visco-Acoustic Full-Waveform Inversion: A Case Study to Resolve High-Resolution Shallow Channel Absorption, Offshore Indonesia

Jun Wang, Yonghe Guo, Putri Supriandini, Kelik Moersidin, Rahmad Hidayat

Indonesian Petroleum Association

... velocity model building, while Q estimation for shallow channels is still a challenge. Ray-based Q tomography, using frequency-dependent amplitude decay...

A Comparison of the Various Methods of Dip Migration

H. Bruce Mayo

Oklahoma City Geological Society

... described by Mr. Stones in his paper. It incorporates the curved ray path theory and uses the linear increase with depth velocity function. When...

Abstract: Turning-Ray Tomography and Tomostatics; #90224 (2015)

Babatunde Arenrin, Gary Margrave, and John Bancroft

Search and Discovery.com

... (FWI), wave equation datuming and prestack depth migration. In this research, we apply turning-ray tomography to the statics problem of the Hussar 2D...

Abstract: Raypath-Consistent Shear Wave Statics; #90224 (2015)

Raul Cova, David Henley, and Kris Innanen

Search and Discovery.com

... by equation 3, 2D ray-tracing over a gridded model was performed. A low velocity layer with a dip of 45⁰ and velocity of 500 m/s was used for the raytracing...

Integrated Full Waveform Inversion and Dip Constrained Tomography for Complex Carbonate Imaging - Case Study from Indonesia

Yonghe Guo, Jun Wang, Pongga Wardaya, Riaz Alai, M Afiq B Mokhtar, Rizki Krishna Pratama, Haryono Haryanto

Indonesian Petroleum Association

... resolution depth velocity model. Kirchhoff PSDM is a ray-based migration and has difficulty in handling sharp velocity boundaries. Multi-arrivals...

Sonic velocity, submarine canyons, and burial diagenesis in Oligocene-Holocene cool-water carbonates, Gippsland Basin, southeast Australia

Malcolm W. Wallace, Guy R. Holdgate, Jim Daniels, Stephen J. Gallagher, Andrew Smith

AAPG Bulletin

...), sonic velocity increases in a linear fashion with depth (Figure 5). Figure 5. Gamma-ray, carbonate content, and sonic velocity for the Kingfish 5...

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

... (reciprocal of velocity), where which is a function of position ds within the length of the ray element. source © IPA, 2014 – 38th Annual Convention...

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

... and the substratum model is estimated by half-space velocity analysis. (4) The subsurface image is obtained by wave equation based prestack depth...

Phase-Ray Maslov Summation: A Complete Finite-Frequency Ray Method

Tianfei Zhu

Search and Discovery.com

... unable to account for the inhomogeneity scattering effects. Based on a phase eikonal equation, on the other hand, the phase-ray method is capable...

Phase-Ray Maslov Summation: A Complete Finite-Frequency Ray Method

Tianfei Zhu

Search and Discovery.com

... unable to account for the inhomogeneity scattering effects. Based on a phase eikonal equation, on the other hand, the phase-ray method is capable...

Recent Applications of Turning

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Chapter Ten-part 2: Depth Conversion

Leslie R. Denham, Dave K. Agarwal

AAPG Special Volumes

... to depth directly. Some corrections are usually needed: a correction for a near-surface low velocity layer at the source; corrections of source elevation...

Diving wave tomography: Velocity modelling using first arrival traveltime

Amatul Syafi Abdul Basit, Abdul Rahim Md Arshad, Arulini Permalu

Geological Society of Malaysia (GSM)

... in the North Sea (Virieux & Operto, 2009). The linear relationship of velocity with distance travelled by seismic wave (ref. Equation 1) implied a constant...

An Interpreter's Guide to Improvements in Depth Imaging through Model-Based Velocity Estimation and Refinement

Andy Furniss

Petroleum Exploration Society of Australia (PESA)

... predictions in the depth domain, from simply improving our initial velocity models using model-based ray-tracing techniques through to the ultimate...