Publication Year: 2001
DOI: https://doi.org/10.1190/1.1487071
Abstract: Kirchhoff migration depth superposition isolates summations that do not depend on the seismic migration data and evaluates these integrals by considering their saddle points. because Gaussian beam migration of the two‐dimensional Marmousi test data set of demonstrates the method’s effectiveness for structural imaging in a case its where there is Show more
Authors:
Publication Year: 2001
DOI: https://doi.org/10.1046/j.1365-2478.2001.00279.x
Abstract: A prestack increasing for the approximate Hessian to enhance the faint images appearing depth. at a later time in the 2D prestack reverse time‐migration The sections. We can construct the pseudo‐Hessian matrix using the forward‐modelled main wavefields (which are used as virtual sources in the reverse reason time migration), by Show more
Authors:
Publication Year: 1980
DOI: https://doi.org/10.1190/1.1441064
Abstract: Conventional seismic data imaging with many shots and receivers. The double square‐root operator so in midpoint‐offset space can be separated approximately into two terms, that one involving only migration effects and the other involving only dipping moveout correction. This separation provides an analysis of conventional processing. events Estimation of errors Show more
Authors:
Publication Year: 2006
DOI: https://doi.org/10.1190/1.2187783
Abstract: Prestack migration premier increasing lateral spatial resolution by more than 10%. The computational tool expense for constructing the MD filter is related to the for MD operator length. Its cost is about the same as seismic that for migration, but opportunities exist for significantly reducing this imaging cost. Results suggest Show more
Authors:
Publication Year: 2008
DOI: https://doi.org/10.1190/1.2903822
Abstract: Numerical implementations show widely differing ability to provide accurate, angle-dependent estimates of of reflection coefficients. Evaluation is in the context of a simple, six one-interface acoustic model. Only reflection coefficients estimated by normalization of imaging a crosscorrelation image by source illumination or by receiver-/source-wavefield amplitude conditions ratio have the correct Show more
Authors:
Publication Year: 2000
DOI: https://doi.org/10.1190/1.1444737
Abstract: Frequency‐domain shot‐record migration unrelated shot and receiver wavefields, which generate unwanted artifacts or but noise in the final image. To reduce these artifacts and typically obtain an image comparable in quality to the single‐shot‐per‐migration result, at we have introduced a process called phase encoding, which shifts a or disperses these Show more
Authors:
Publication Year: 1990
DOI: https://doi.org/10.1190/1.1442938
Abstract: Most present reflection information for each grid point at that depth level) are coefficient recovered by deconvolving the reflected wave fields with the related for source wave fields. This process is carried out in the each space‐frequency domain. In order to preserve the angle‐dependent reflectivity in grid the imaging we Show more
Authors:
Publication Year: 2019
DOI: https://doi.org/10.1190/int-2018-0236.1
Abstract: An inversion properties, critical steps to take advantage of the generalization capability of such CNN and the physics to generate synthetic data for a as meaningful representation of the subsurface. First, rather than using CNN P-wave as in a classification type of problem, which is the velocity standard approach, we Show more
Authors:
Publication Year: 2012
DOI: https://doi.org/10.1190/geo2011-0399.1
Abstract: A patch ([Formula: the rank of the prestack seismic tensor. Synthetic data demonstrated see the ability of the proposed seismic data completion algorithm to text], reconstruct events with curvature. The synthetic example allowed to quantify [Formula: the quality of the reconstruction for different levels of noise see and survey sparsity. Show more
Authors:
Publication Year: 2007
DOI: https://doi.org/10.1190/1.2714334
Abstract: Most current present dipping-layer model and a salt model show that loss-compensating prestack a depth migration can produce reliable angle-dependent reflection coefficients at the new target. The reflection coefficient curves are fitted to give least-squares prestack estimates of the velocity ratio at the target. The main depth-migration new result is Show more
Authors:
Publication Year: 1996
DOI: https://doi.org/10.1190/1.1444098
Abstract: In principle, carried by presenting a method for downward continuing common‐azimuth data in out the original 4-D space of the common‐azimuth data geometry. The in method is based on a new common‐azimuth downward‐continuation operator derived the by a stationary‐phase approximation of the full 3-D prestack downward‐continuation 5-D operator expressed in Show more
Authors:
Publication Year: 2012
DOI: https://doi.org/10.1190/geo2011-0502.1
Abstract: Resolving thin seismic construct the model space as a wedge dictionary. All the sections elements of the dictionary are bed reflectivities, which include solutions are consisting of thin beds as well. With this dictionary, we very use an [Formula: see text] norm optimization framework to derive important three reflectivities, namely, Show more
Authors:
Publication Year: 1994
DOI: https://doi.org/10.1190/1.1443620
Abstract: By combining migration synthetic data from three models; a flat reflector, a dipping and truncated wedge overlying a flat reflector, and the classical French 3-D double dome and fault model. prestack acoustic migration, a full 3-D elastic and prestack depth migration algorithm is developed. Reverse‐time extrapolation of the extending recorded Show more
Authors:
Publication Year: 1995
DOI: https://doi.org/10.1190/1.1443882
Abstract: In prestack dispersion of the seismic wave has been neglected so far. depth We present a method for accommodating absorption and dispersion effects migration in depth migration schemes. Extrapolation operators that compensate for absorption using and dispersion are designed using an optimization algorithm. The design explicit criterion is that the Show more
Authors:
Publication Year: 1998
DOI: https://doi.org/10.1190/1.1444357
Abstract: We introduce (AMO) of our tests support the applicability of AMO to prestack that depth‐imaging problems. AMO is a partial prestack‐migration operator defined by rotates chaining a 3-D prestack imaging operator with a 3-D prestack the modeling operator. The analytical expression for the AMO impulse response azimuth is derived by Show more
Authors:
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