... the dimensionality of the problem. We present a process-based proxy-modeling approach to approximate high-resolution environmental models. The strategy involves two levels of approximations: 1) a coarser spatial discretization of the geophysical forward problem, and 2) a model-order-reduction of the inverse problem...

... artificial intelligence frequency annual meeting new data matrix electromagnetic inversion drilling data dikun yang haber data assimilation drilling measurement logging while drilling transmitter mesh real time system conductivity inversion forward problem seg seg international...

... from the partial differential equation for gravity, we are able to alleviate these limitations. This method directly solves for a continuous function of the gravity field, rather than producing a solution at discrete points. The forward problem is evaluated for numerical accuracy using a simple...

... inversion algorithm for AEM data interpretation. Due to the moving platform of AEM systems, too many forward problems need to be solved for the three-dimensional AEM inversion. Thus, we adopt the multi-frontal matrix factorization technology to directly solve the modeling equations. Comparing...

... SUMMARY The main cost of Gauss-Newton (GN) inversion of time-domain controlled-source electromagnetic (tCSEM) data is comprised of the multiple solutions of the forward problem and linear-algebraic operations using the Jacobian matrix. For large-scale 2.5D and 3D problems with multiple sources...

... application case for recovering high-velocity concrete structures. In this particular configuration, large amplitude multi-scattered waves are generated, which are better taken into account using the exact-Newton method. pressure wave velocity model forward problem université joseph fourier grenoble...

... inverse problem ip survey haber dc ip data forward problem upstream oil & gas chargeability algorithm equation oldenburg octree mesh optimization problem rectilinear mesh electrode artificial intelligence matrix inversion discretization mesh resolution information...

... element computation geophysics gradient algorithm iteration stochastic optimization inverse problem electromagnetic problem forward problem inversion artificial intelligence haber electric field optimization technique Finite element based inversion for electromagnetic problems using...

... vertical profile forward problem frequency-domain elastic full-waveform inversion iteration algorithm artificial intelligence upstream oil & gas imaging gradient application pratt anomaly elastic parameter gradient method operto reservoir characterization elastic full...

...3D frequency-domain full-waveform tomography based on a domain decomposition forward problem Hafedh Ben-Hadj-Ali , Ge´osciences Azur CNRS, Ste´phane Operto, Ge´osciences Azur CNRS, Jean Virieux, University Joseph Fourier of Grenoble and Florent Sourbier, Ge´osciences Azur CNRS SUMMARY We present...

... with the fact that only few frequencies need to be inverted when considering wide-aperture geometries make the frequency-domain formulation much faster than the time-domain counterpart for 2D applications. The main drawback of the frequency-domain formulation is the high memory complexity of the forward problem...

... measurements of the electric and/or magnetic fields. A standard Tikhonov regularization is incorporated and we use an inexact, all-at-once methodology (Biros and Ghattas, 2000; Haber and Ascher, 2001b), solving the forward problem and the inverse problem simultaneously in one iterative process. This approach...

.... velocity model mende interpolation reservoir characterization forward problem solver image gather upstream oil & gas celerity eikonal equation velocity field extrapolation traveltime table traveltime model building fast reconstruction san antonio traveltime reconstruction velocity scan...

... Summary In this paper we present two methodologies to invert for the base of the salt interface from surface gravity and tensor gravity data. The forward problem is formulated by assuming a constant density model for the salt and a variable density model for sediments based on the well logs...

... ABSTRACT No preview is available for this paper. singularity restriction equation velocity-weighted wavefield function wavefield fredholm integral equation upstream oil & gas modeling reference medium approximation forward problem velocity-weighted wavefield forward...

... ABSTRACT No preview is available for this paper. inverse process lawrence berkeley laboratory summary reservoir characterization imaging nonlinear three-dimensional resistivity inverse imaging information surface data algorithm upstream oil & gas forward problem inverse...

...-sophia antipolis sa method forward problem jean virieux reservoir characterization model space misfit function Nonlinear inversion of synthetic seismic reflection data by simulated annealing Pascal Amand* and Jean Virieux, Universite de Nice-Sophia Antipolis, France PP4.4 S u m m a r y We...

... madden matrix vector mackie upstream oil & gas earth resource laboratory boundary condition conjugate gradient relaxation algorithm forward modeling inversion equation resistivity forward modeling forward problem reservoir simulation sensitivity matrix inversion iteration...

... ABSTRACT No preview is available for this paper. amplitude variation ikelle background reconstruction tensor inversion azimuthal angle forward problem background azimuthal section equation schlumberger cambridge research upstream oil & gas anisotropic background...

... waveform inversion avo inversion genetic algorithm subhashis mallick forward problem reservoir characterization amplitude-versus-offset data p-wave velocity Waveform Inversion of Amplitude-Versus-Offset Data Using a Genetic Algorithm SL2.7 Subhashis Mallick, Western Geophysical SUMMARY I cast...