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The AAPG/Datapages Combined Publications Database
Showing 73,077 Results. Searched 200,293 documents.
High-precision seismic imaging for complex deep structures in the hydrocarbon exploration using a coherent-stacking-based least-squares migration
Jidong Yang, Jianping Huang, Tengfei Lin, Zhenchun Li, and Liang Chen
AAPG Bulletin
... paths of reflection events: where is a depth function associated with the half-opening angle and azimuth and can be computed using any automatic event...
2024
High-Resolution Model Building in a Full-Azimuth Nodal Survey in the GOM
Sandip Chattopadhyay, Gary Rodriguez, Tefera Eshete, Guy Hilburn, TGS
GEO ExPro Magazine
... incorrect depth migration results and can lead to velocity distortions during successive tomography-based model building. The problem is instead...
2016
Value of conventional PS-wave velocity analyses for PSDM of deep-water OBS data
James Gaiser, James Simmons, Moacyr de Souza Bezerra
International Meeting for Applied Geoscience and Energy (IMAGE)
... and Hale, 2014). From VP/VS(tP)=g (tP), as a function of P-wave time, S-wave velocity, VS(tP)=VP(tP)/g (tP), can also be determined in Pwave time using...
2022
Full-Waveform Inversion Application on 2D Slanted Streamer Data - A Case Study
Andreas Waluyo
Indonesian Petroleum Association
... migration workflow that includes designature to zero phase, random and linear noise attenuation, multiple elimination, Kirchhoff prestack depth...
2014
3D velocity model building based upon hybrid neural network
Herurisa Rusmanugroho, Junxiao Li, M. Daniel Davis Muhammed, Jian Sun
International Meeting for Applied Geoscience and Energy (IMAGE)
... accurate 3D complex velocity model. The transformation of the linear output to the nonlinear is performed using ReLU (Nair and Hinton, 2010...
2022
Abstract: Estimation of Dispersive Parameters of Surface Wave Using the Generalized S Transform; #90187 (2014)
Roohollah Askari and Robert J. Ferguson
Search and Discovery.com
.... The cost function is highly non-linear and has lots of local minima, so it is impossible to solve it using some gradient methods such as Steepest...
2014
Delineating Thin-Bed Tight Gas Sand Reservoir with Prestack Joint PP/PS Inversion, #41363 (2014)
Zhiwen Deng, Ming Qiang, Shuanghu Shi, Xiaofeng Liang, Yang Zhu, Yijun Zhou, Qingjia Tong
Search and Discovery.com
... analysis approach from 3C data that can image P and Sv-waves in the same PP or PS wave time scale. In fact, we carry out the velocity analysis in depth...
2014
Accelerated augmented Lagrangian full-waveform inversion based on truncated randomized singular value decomposition
Jiahang Li, Hitoshi Mikada, Junichi Takekawa
International Meeting for Applied Geoscience and Energy (IMAGE)
... such as nonconvexity and nonlinearity. The convexity of the objective function can often be enhanced by using a better initial model or a lower starting frequency...
2023
ABSTRACT: First Arrival Tomography Using Depth-Varying Velocity Gradients; #90113 (2010)
Hui Liu and Hua-Wei Zhou
Search and Discovery.com
...ABSTRACT: First Arrival Tomography Using Depth-Varying Velocity Gradients; #90113 (2010) Hui Liu and Hua-Wei Zhou First Arrival Tomography Using...
2009
ABSTRACT: Porosity-Velocity Distribution in Stratigraphic Sequences: The Marion-Yin Model; #90013 (2003)
JUAN FLOREZ, GARY MAVKO
Search and Discovery.com
... of transitional facies changes from clean sand to pure clayey shale in the velocity-porosity plane varies from a linear trend at low confining pressure...
2003
The Earthquake Process in Oklahoma; #80497 (2015)
Robert B. Herrmann, Han Su, Hao Guo
Search and Discovery.com
... with the linear patterns of epicenters determined using multiple event relocations (McNamara et al., 2015) permits the specification of the fault plane...
2015
Flowback Analysis of the Abadi Field
Iwan Kurniawan
Indonesian Petroleum Association
... by calculating the terminal settling (critical) velocity of each material and investigates using OLGA software whether the gas velocity is sufficient...
2013
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...
2013
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...
2014
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...
2018
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...
1996
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...
2006
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...
2020
Discussing Demigration Uncertainties Applied to Active Focused Seismic Monitoring
Baptiste Penot, Bruce Webb, Michele Buia, Gianluca Dell’Elce
Carbon Capture, Utilization and Storage (CCUS)
... the process is highly non-linear (Cerveny, 2000) and uses local model values. Therefore, changing a velocity model or a horizon depth is expected...
2025
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...
2016
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...
2014
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...
2013
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...
2014
Reflection waveform inversion assisted by full-wavefield imaging
Mikhail Davydenko, Eric Verschuur
International Meeting for Applied Geoscience and Energy (IMAGE)
... function penalizes energy outside zero subsurface offset using penalty operator A. Figure 2 shows the true velocity and density models (Figures 2 a,b...
2022