The wave-equation target-oriented inversion has a big null space. It seeks to form an image where there is lack or very little data information. In this situation is where a priori information in the form of mo
When an electromagnetic wave propagates from one medium to another, the reflectivity (R) is calculated by the following equation: $$ R = \left( {\frac{{Z_{2} - Z_{1} }}{{Z_{2} + Z_{1} }}} \right)^{2} $$ (2) Z1 and Z2 are the wave impedances of the two media,...
We focused on data selection using 3D ray-tracing, but this workflow can be easily adapted to use finite-difference wave-equation modelling. The data selection information can either be used to scale up weak primary signal before migration or to be migrated separately and merged into a full ...
aA shortcoming of the presented inversion approach is that the source of the wave field is assumed to be located at the top of the target zone. In reality,this will rarely be the case. Instead, overburden layers with variable properties that cause reflections and multiples will also have an ...
we present an efficient target-oriented inversion scheme for time-lapse seismic data using an integral equation formulation with Gaussian beam based Green's function approach.The proposed time-lapse approach allows one to perform a local inversion within a small region of interest(e.g.a reservoir ...
Therefore, we propose a prospective application of the convolution‐type representation for the acoustic wavefield in the frequency–space domain formulated as a target‐oriented waveform inversion method. Our approach aims at matching the observed and modelled upgoing wavefields at a target depth level...
Toward Target-Oriented FWI: An Exact Local Wave Solver Applied to Salt Boundary Inversionacoustic, full-waveform inversion, frequency-domain, modeling, finite differenceSummary Seismic full waveform inversion (FWI) uses the gradient of the objective function for computing model updates. This requires ...
reservoir characterization, acoustic velocity model, expanded abstract, target area, artificial intelligence, elastic inversion, full-waveform inversion, seg international exposition, upstream oil & gas, biondiWe combine two inversion techniques to achieve an accurate wave-equation-based elastic-parameter ...
P.M. Karve, A. Fathi, B. Poursartip, L.F. Kallivokas, Source parameter inversion for wave energy focusing to a target inclusion embedded in a three-dimensional heterogeneous halfspace, in: International Journal for Numerical and Analytical Methods in Geomechanics (submitted for publication)....
In particular, an empirical, linear rock-physics model, properly calibrated for the investigated area, is used to rewrite the P-wave reflectivity equation as a function of the petrophysical contrasts instead of the elastic constants. This reformulation allows for a direct and a...