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Keywords: traveltime
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3567899
...-depth curves extracted from the simulated DAS and geophone records produce comparable results. We further analyze the effect of DAS acquisition parameters and source offset on traveltimes and inverted velocities. We show the importance of using a small gauge length of 1-2 m for accurate characterization...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3582729
... fracturing operation in Oklahoma. machine learning deep learning ann location reservoir characterization upstream oil & gas microseismic event neural network accuracy artificial intelligence applied geoscience earthquake arrival time event location traveltime eisner p-wave arrival...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583890
... In real-time microseismic monitoring, the ability to efficiently compute source-receiver traveltimes can help in significantly speeding up the model calibration and hypocenter determination processes, thus ensuring timely information about the subsurface fractures for use in effective decision...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583574
... source receiver pair pressure component velocity inversion kernel fresnel zone saudi arabia government receiver pair surface complexity amplitude reservoir characterization traveltime kernel applied geoscience wavefield exploration geophysicist 10 p-wave velocity Impacts of near surface...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594650
... phases 96 geophones (natural frequency 5 HZ) to record the KF propagated laterally along east and west causing energy over a 5.2 km long profile. We have applied the diversion of the River Dabka and Baur (Malik et al., Traveltime Tomography (TTT) of refracted phases to 2014). Mainly, sandstone...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3595023
...- pute so an iterative gradient method is used to estimate the We present a tomographic deconvolution procedure for high- solution: resolution imaging of velocity anomalies between re ecting interfaces. The key idea is to rst invert re ection or transmis- residual=r(k) sion traveltimes...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424666
..., the traveltime, envelope and waveform of observed and modelled first arrivals are fitted simultaneously with variable weighting factors. It not only reduces the dependence on the initial velocity model but also naturally realizes the multi-scale inversion. In every iteration of the inversion, one-time simulated...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427899
... reflectivity modeling single-scattering wave modeling method modeling formula gaussian beam shot gather seg international exposition gb-born modeling reservoir characterization efficiency wavefield wave propagation traveltime Born modeling for single-scattering waves in 2D visco-acoustic medium...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427542
... of the microseismic event using peak amplitudes and traveltimes of P and S waves as input features. To examine the factors affecting the results of moment tensor inversion using ML model, we analyze the sensitivity of three factors, the error in the peak amplitude due to noise, the error in travel time due to picking...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3423159
... Traveltimes are essential for seismic applications ranging from imaging to tomography. Traveltime computations in anisotropic media, which are better representative of the true Earth, require solving the anisotropic eikonal equation. Numerical techniques to solve the anisotropic eikonal equation...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427491
... seismic wave receiver irregularity traveltime reservoir characterization surface wave exploration geophysicist 10 wave interferometry upstream oil & gas interferometry seg international exposition train traffic noise scatterer seismic interferometry train-induced vibration...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3411920
... tomography, which limits the options for structural uncertainty estimation. We demonstrate the benefits of hierarchical transdimensional Bayesian first arrival tomography on an exploration-scale 2D scenario. Such a tomography yields multiple models of the near-surface that fit the observed traveltimes...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3413593
... The first-arrival traveltime tomography (FATT) is an inversion method which represents shallow velocities so that it is widely used to identify subsurface images in oil and gas industry as well as civil engineering and geotechnical industries. The provided shallow velocity can be generally...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214496
... ABSTRACT Velocities estimated from seismic traveltime analyses are along the direction of the energy propagation, which are ray (group) velocities, and offset-to-angle transformation using these velocities via ray-tracing are ray (group) angles. Elastic properties on the other hand are related...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214902
... ABSTRACT We present a workflow to estimate a subsurface velocity model from challenging seismic data based on automatic 3D reflection tomography using coherent events in post-stack and pre-stack domains. The kernel of the method is based on hyperbolic approximation of traveltimes using pre...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216779
... ABSTRACT At the last SEG meeting we presented the Eigenray method for finding stationary traveltime ray trajectories in 3D smooth heterogeneous anisotropic media, by applying a non-linear finite element scheme. We applied the Newton method that requires both gradient and Hessian...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216695
... that requires both gradient and Hessian of the traveltime with respect to nodal locations and ray velocity directions. In this work we show how the global Hessian matrix of the stationary ray can be used to compute and geometric spreading. We compare the accuracy of geometric spreading computed by our proposed...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216698
... of TOR media composed of homogeneous layers separated by plane dipping interfaces. The input data include the normal-moveout (NMO) ellipses, zero-offset traveltimes, and reflection time slopes of P-waves and split S-waves (S and S). The inversion can be facilitated by assuming that the reflector...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-W6-01
... ratio. The benefits of including PS and SS data in addition to PP data for seismic reservoir characterization through elastic inversion are illustrated on a synthetic dataset. information inversion ss data amplitude only low frequency traveltime inversion result upstream oil & gas...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215198
...:40 PM Location: 225B Presentation Type: Oral kernel inversion operator seg international exposition objective function wave equation equation adjoint wavefield reservoir characterization formulation fréchet kernel initial model traveltime dist upstream oil & gas geophysics...

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