High resolution migration from topography: Experience with a mountainous area in China

Ma, Yongshang; Wang, Shangxu; Sun, Chuanwen

doi:10.1190/1.2370342

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Prestack Kirchhoff time migration is characteried by better suitability for velocity model, stable and targetoriented computation [1∼4] , which is the routine procedure of seismic data processing currently. Particularly for the mountainous regions of western China, where geological structure is quite complicated, surface elevation varies violently, and the imaging computation depends mainly on prestack time migration [5] . The theory of prestack Kirchhoff time migration supposed that the shots and receivers are situated at the same plane, but the acquisition of real seismic data is often made on an irregular surface; to meet the demands of migration treatment, the static correction technique based on vertical ray path can be used to put all shots and receiver points of seismic data into an united plane and then conduct the routine treatment.…”

Section: Introductionmentioning

confidence: 99%

Method of Prestack Time Migration of Seismic Data of Mountainous Regions and Its GPU Implementation

Liu

et al. 2009

Chinese J of Geophysics

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The geological structure in the mountainous regions of western China is quite complicated, and the elevation varies violently. At present, the main approach for seismic data imaging is the prestack Kirchhoff time migration, however, violent variation of surface elevation makes the datum plane selection of prestack time migration very difficult. This article proposed a new prestack time migration method through modifying the routine travel time computation, this method can greatly raise the imaging effect in mountainous region with obvious variation of surface elevation. In addition, this paper also introduced application of GPU in prestack time migration, by which the prestack time migration has been optimized and implemented, and the computation efficiency of single NVIDIA Tesla C1060 GPU can be more than 70 times faster than single core CPU with main frequency of 2.5 GHZ when without the I/O problem.

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Section: Introductionmentioning

confidence: 99%

Method of Prestack Time Migration of Seismic Data of Mountainous Regions and Its GPU Implementation

Liu

et al. 2009

Chinese J of Geophysics

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Reverse time migration from topography

Shragge

2014

GEOPHYSICS

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Migration of seismic data from topography using methods based on finite-difference (FD) approximation to acoustic wave propagation commonly suffers from a number of imaging drawbacks due to the difficulty of applying FD stencils to irregular computational meshes. Altering the computational geometry from Cartesian to a topographic coordinate system conformal to the data acquisition surface can circumvent many of these issues. The coordinate transformation approach allows for acoustic wave propagation and the crosscorrelation and inverse-scattering imaging conditions to be posed and computed directly in topographic coordinates. Resulting reverse time migration (RTM) images may then be interpolated back to the Cartesian domain using the known inverse mapping. Orthogonal 2D topographic coordinates can be developed using known conformal mapping transforms and serve as the computational mesh for performing migration from topography. Impulse response tests demonstrate the accuracy of the 2D generalized acoustic wave propagation. RTM imaging examples show the efficacy of performing migration from topography directly from the data acquisition surface on topographic meshes and the ability to image complex near-surface structure even in the presence of strong lateral velocity variation.

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Least-squares reverse time migration through anisotropic tensorial elastodynamics

Konuk

Shragge

2020

SEG Technical Program Expanded Abstracts 2020

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High resolution migration from topography: Experience with a mountainous area in China

Cited by 3 publications

References 3 publications

Method of Prestack Time Migration of Seismic Data of Mountainous Regions and Its GPU Implementation

Method of Prestack Time Migration of Seismic Data of Mountainous Regions and Its GPU Implementation

Reverse time migration from topography

Least-squares reverse time migration through anisotropic tensorial elastodynamics

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