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...

Enhanced ray-based tomography method

Jonathan Liu

International Meeting for Applied Geoscience and Energy (IMAGE)

... has demonstrated its superiority in many applications, ray-based tomography still plays a significant role in velocity model building, due to its...

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...

ABSTRACT: Seismic Modeling with One-Way Wave Equation, by Jiao, Jianwu; Saleh, Saleh M.; Verschuur, Eric; #90141 (2012)

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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: Subsalt Migration Velocity Analysis with the Common Image Cube Approach, by K. Mansoor, O. Hermant, H. Baudon, S. Warzocha, and M. Van De Rijzen, #90188 (2014)

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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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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...

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...

Premigration attenuation analysis and mapping to image domain by weighted migrations

Yonghe Sun, Chunling Wu, Mark Fan, Zhemin Tan

International Meeting for Applied Geoscience and Energy (IMAGE)

... an interpretation of equation (10) for a small change from Δ𝑡 to 𝑡 + Δ𝑡 along the ray path 𝒙(𝑡) starting with 𝒙(0) = 𝒔. The Δ𝑡 corresponds...

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...

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: Tomographic Reflected-Wave FWI Using Time Lag; #90254 (2016)

Geoff Clark, Yilong Qin

Search and Discovery.com

...-wavelength velocity model. However, ray theory does not properly describe wave propagation in the case of complex heterogeneities such as a low...

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...

Wide-angle AVO-inversion using constant P-traces: AVP-inversion

Dennis Cooke

International Meeting for Applied Geoscience and Energy (IMAGE)

... inversion over narrow-angle inversion by using singular value decomposition of the AVA linear operator G in equation (1): 𝑮 𝒎 = 𝒅 𝜽 …………………………………(1...

AVO Analysis for Direct Hydrocarbon Detection in Field X in the Persian Gulf (Paper 5)

Mohammad Ali Riahi, Mohammad Emami Niri

Geological Society of Malaysia (GSM)

... velocity map of section was computed by finding a multi-linear relationship between sonic logs and attributes. Then this relationship was applied...

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...

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...

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...

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...

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

... tomography has been an efficient and robust tool to derive large-scale near-surface velocity models for decades (Zhang and Toksöz, 1998). Ray theory...

Joint velocity and event location inversion workflow in microseismic reservoir monitoring

Takashi Mizuno, Joel Le Calvez, Manish Lal Khaitan, Giulia Barisione, Irina-Tulia Stoia, Prakash Ranjan, Stefano Clerico, Xinyuan Li, Zheyuan Huang

International Meeting for Applied Geoscience and Energy (IMAGE)

... with different wavelengths. Using the Fourier transform for the velocity along with the depth, equation (1) can be written in the following form: Figure 2...