Least-squares kirchhoff migration
NettetLeast-squares (LS) migration based on Kirchhoff modeling/migration operators has been proposed in the literature to account for uneven subsurface illumination and to reduce imaging artifacts due to irregularly and/or coarsely sampled seismic wavefields (Nemeth et al., 1999; Duquet et al., 2000). Nettetsolving the linear system of Kirchhoff Least-Squares Prestack Time Migration equation. To date, this study shows that the standard multigrid method is not able to solve the Kirchhoff Least-Squares Prestack Time Migration equation for at least two reasons. First, the kernel of the main problem, s " s, is not a diagonally dominant matrix, therefore,
Least-squares kirchhoff migration
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NettetLeast squares Fourier reconstruction is basically a solution to a discrete linear inverse problem that attempts to recover the Fourier spectrum of the seismic ... To precondition the data properly for Kirchhoff migration, we desire full, uniform coverage of offsets and azimuths. Unfortunately, this can increase the size of the survey by an ... NettetLeast squares Kirchhoff depth migration: important details Daniel Trad CREWES-University of Calgary Summary Least squares migration has been an important research topic in the academia for about two decades, but only recently it has attracted interest from the industry. The main reason is that from a practical point
NettetKirchhoff migration and inversion CREWES Research Report Š Volume 14 (2002) 7 In the migration problem, the signal to be detected is the diffraction. Diffraction stack migration then becomes a cross-correlation of the data with an estimate of the diffraction. According to matched-filter theory, the amplitudes on the estimated diffraction must NettetSummary This paper discusses the implementation of image-domain least-squares Kirchhoff depth migration (LSKDM) through the use of point spread functions (PSFs). …
Nettetdifficult. The transpose of which is migration may be used as an approximation to the : , (3) where is the migrated image and is the migration operator. Kirchhoff migration produces some artifacts in the migrated image. These migration artifacts can be attenuated by the Least-Squares Migration (Nemeth et. al., 1999). NettetEstimation of elastic specular reflectivity by Kirchhoff prestack depth migration: WKBJ least-squares theory Lumley D. E. Estimation of elastic specular reflectivity from …
Nettet7. mai 2015 · Finally, I present results using a Least Squares implementation of Kirchhoff Pre-Stack Depth Migration. a) Velocity model (b) Migration from dense node …
Nettet17. sep. 2024 · Least-squares migration in the data domain can improve the migration image illumination and mitigate the migration artifacts. But it requires many iterations … corned beef and cabbage boiledNettet28. apr. 2024 · The lunar penetrating radar (LPR) carried on the Chang E-3 Yutu Rover observations at 500 MHz successfully reveals the thickness and geological structure of the shallow lunar regolith. Previous work used the calculated permittivity and the migration image to estimate the layer interface and local target. In this letter, a least-squares … corned beef and cabbage boxtyNettet5. aug. 2014 · A three dimensional least-squares Kirchhoff migration (LSM) is developed in the prestack plane-wave domain to increase the quality of migration … fangraphs is better than baseball referenceNettet1. sep. 2024 · Reverse-time migration can be formulated in a least-squares inversion framework. This is referred to as least-squares reverse-time migration, which attempts to find an optimal model of the ... corned beef and cabbage bakeNettetA Kirchhoff least-squares migration (LSM) is developed in the prestack plane-wave domain to increase the quality of migration images. A regularization term is included … fangraphs job listingNettetWe apply iterative resolution estimation to least-squares Kirchhoff migration. Reviewing the theory of iterative optimization uncovers the common origin of different optimization … corned beef and cabbage columbia moNettetLeast-squares migration can be used for this purpose. Least-squares migration with Kirchhoff operator was one of the early attempts (Tarantola, 1984;Nemeth et al., 1999; … corned beef and cabbage barley soup