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 model regularization can help to stabilize the results. One choice for regularization...
Geophysics, 71(4): A35-A38.Target-oriented wave-equation inversion: Sigsbee model: SEP-Report, 129, 65-74. AA Valenciano,BL Biondi,RG Clapp - 《Geophysics》 被引量: 145发表: 2009年 Target-oriented wave-equation inversion: regularization in the reflection angle A complex velocity model produc...
A target-oriented strategy can be applied to estimate the waveequation least-squares inverse image (m) by explicitly computing the Hessian (H). The least-squares inverse image is obtained as the solution, using a conjugate gradient algorithm, of a non-stationary least-squares filtering problem Hm...
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...
Source parameter inversion for wave energy focusing to a target inclusion embedded in a three-dimensional heterogeneous halfspacedoi:10.1002/nag.2662Pranav M. KarveArash FathiBabak PoursartipLoukas F. KallivokasWiley
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 simultaneous ...
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)....
Formulations are given in Equation (12) as below: 𝑋P=|O′B′|=(𝑋O′−𝑋B′)2+(𝑌O′−𝑌B′)2−−−−−−−−−−−−−−−−−−−−−−−√𝛼WD=cos−1 ⎜⎜⎜⎜𝑋B′(𝑋O′−𝑋B′)2+(𝑌O′−𝑌B...