... subsurface parameter tomography artificial intelligence velocity model seg international exposition velocity perturbation reservoir characterization receiver application slope tomography eikonal solver exploration geophysicist 10 hypocenter-velocity problem origin time equation formulation...

... of velocity perturbations and finding the global optimal solution, unlike local search methods that are based on gradient descent or ascent. The velocity updates are represented by hierarchical-scale basis functions. The goal is to find the updates that maximize the sum of the squares of the amplitudes...

... anomaly machine learning optimization problem expanded abstract geophysics artificial intelligence velocity model update seg international exposition exploration geophysicist 10 reservoir characterization upstream oil & gas migration inversion tomography velocity perturbation stack...

...: Wednesday, September 18, 2019 Session Start Time: 1:50 PM Presentation Time: 4:45 PM Location: 221A Presentation Type: Oral velocity perturbation seg 10 velocity model velocity determination reservoir characterization seg international exposition annual meeting upstream oil & gas...

... initial model seismic data full waveform inversion information velocity perturbation low-frequency information wavefield fwi wavelet objective function reservoir characterization geophysics optimization problem adjoint source low-frequency data inversion waveform inversion spectra...

... velocity perturbations into a linear inversion system to reduce the tradeoff in the multi-parameter waveform inversion. Applications on synthetic data generated from a modified Overthrust model and a modified Marmousi model show the effectiveness of the proposed method. Presentation Date: Tuesday...

... background velocity geophysics seg international exposition gradient reservoir characterization high-wavenumber artifact energy norm waveform inversion information artifact perturbation imaging condition inversion velocity perturbation background model Alkhalifah , T. , 2015...

..., we propose a generalized Rytov approximation (GRA) which is valid for arbitrary velocity perturbations as long as the scattering-angles are small. We also show that GRA can be degenerated to the Rytov approximation by taking the first-order approximation of the model perturbation function. Based...

... be handled with the first-order Rytov approximation, the weak velocity perturbation assumption is still a major limitation. To break the weak-perturbation limitation, we combine the recently developed generalized Rytov approximation and the finite frequency theory, and propose a new finite-frequency...

... meeting dynamic overburden interpretation overburden inversion shearwater field interpretation seg international exposition reservoir characterization pre-stack time-shift field velocity perturbation macbeth time-shift field perturbation Chen , G. , D. Chu , M...

... media, particularly in the presence of noise. When simultaneous perturbations of velocity and source locations occur, CWI estimates of source perturbation remain accurate in the presence of a velocity perturbation. However, estimates of velocity perturbation exhibit errors of up to 0.5% in the presence...

... Least-squares reverse-time migration faces difficulties when it inverts the data containing strong components related to density variation with velocity-only Born modeling operator. The strong density perturbation will be inverted as strong dummy velocity perturbations, which influence...

..., 2018 Start Time: 9:20:00 AM Location: Poster Station 7 Presentation Type: Poster full-waveform inversion full waveform inversion student version gradient impedance velocity perturbation reservoir characterization parametrization dipole source upstream oil & gas recovery...

... ABSTRACT The traditional methods to image the salt bodies do not consider near-salt stress perturbations caused by the salt, and the associated velocity perturbations of elastic seismic waves in the sediments near the salt. To demonstrate the importance of stress changes caused by the salt...

... SEG Annual Meeting. seg international exposition gradient equation application velocity perturbation modeling waveform inversion imaging condition wavefield seperation upstream oil & gas reflection reservoir characterization delta function energy norm frequency domain seg seg...

... Presentation Type: POSTER velocity perturbation upstream oil & gas image quality seg seg international exposition seismic imaging spectra accuracy psf annual meeting annual international meeting migration velocity model reservoir characterization imaging velocity fluctuation...

... AM Location: 162/164 Presentation Type: ORAL migration formula waveform inversion upstream oil & gas fwi velocity profile inversion rtm image zhang reservoir characterization gradient velocity perturbation iteration boundary condition velocity inversion reflectivity seg...

... (RTM) using a deconvolution imaging condition, and it was limited to the estimation of velocity perturbation from reflection data. Here we extend the approach to a joint velocity and density preserved-amplitude FWI. We derive expressions for the improved common-shot FWI gradients, and show how we can...

...), which includes all orders of scattering effects, can avoid the initial model dependence. From the T-matrix to estimate the velocity perturbation, it requires matrix inversion which is always time consuming. In order to achieve that efficiently, previously we have proposed Inverse Thin-Slab Propagator...

... perturbation full-waveform inversion velocity perturbation iteration angle-domain wavenumber filter equation reservoir characterization geophysics velocity model inversion awfwi frequency wavenumber component annual international meeting information seg upstream oil & gas...