A robust scheme to output angle-domain common image gathers for shot-profile migration
نویسندگان
چکیده
منابع مشابه
Offset and angle domain common-image gathers for shot-profile migration
In order to estimate elastic parameters of the subsurface, geophysicists need reliable information about angle-dependent reflectivity. In this paper, we describe how to image nonzero offsets during shot-profile migration so that they can be mapped to the angle domain with Sava and Fomel’s (2000) transformation. CIGs also contain information about how well focused events are at depth, and so pro...
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Prestack depth migration of shot profiles by downward continuation is a practical imaging algorithm that is especially cost-effective for sparse-shot wide-azimuth geometries. The interpretation of offset as the displacement between the downward-propagating (shot) wavefield and upward-propagating (receiver) wavefield enables us to extract offset-domain common imagepoint (CIP) gathers during shot...
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I present a general methodology for computing Angle-Domain Common Image Gathers (ADCIGs) in conjunction with anisotropic wavefield-continuation migration. The method is based on the transformation of the prestack image from the subsurface-offset domain to the angle domain by use of slant stacks. The processing sequence is the same as for the computation of ADCIGs for the isotropic case, though ...
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Shotand offset-domain common image gathers encounter problems in complex media. They can place events that come from different points in the subsurface at one subsurface location based on identical arrival times and horizontal slownesses. Angle-domain common image gathers uniquely define ray couples for each point in the subsurface, therefore each event in the data will be associated with only ...
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Wavefield-extrapolation methods can produce angle-domain common-image gathers ADCIGs . To obtain ADCIGs for converted-wave seismic data, information about the image dip and the P-to-S velocity ratio must be included in the computation of angle gathers. These ADCIGs are a function of the half-aperture angle, i.e., the average between the incidence angle and the reflection angle. We have develope...
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ژورنال
عنوان ژورنال: ASEG Extended Abstracts
سال: 2012
ISSN: 2202-0586
DOI: 10.1071/aseg2012ab080