2010
DOI: 10.1111/j.1365-2478.2010.00888.x
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Abstract: A B S T R A C TWavefield-based migration velocity analysis using the semblance principle requires computation of images in an extended space in which we can evaluate the imaging consistency as a function of overlapping experiments. Usual industry practice is to assemble those seismic images in common-image gathers that represent reflectivity as a function of depth and extensions, e.g., reflection angles. We introduce extended common-image point (CIP) gathers constructed only as a function of the spaceand time-… Show more

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Cited by 126 publications
(89 citation statements)
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“…The extended imaging condition (Rickett & Sava, 2002;Sava & Fomel, 2006;Sava & Vasconcelos, 2011) is similar to the conventional imaging condition except the cross-correlation lags between source and receiver wavefield are preserved in the output:…”
Section: Extended Imaging Conditionmentioning
confidence: 99%
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“…The extended imaging condition (Rickett & Sava, 2002;Sava & Fomel, 2006;Sava & Vasconcelos, 2011) is similar to the conventional imaging condition except the cross-correlation lags between source and receiver wavefield are preserved in the output:…”
Section: Extended Imaging Conditionmentioning
confidence: 99%
“…In this case the signal is defined as the reflectivity and the noise is the backscattered energy (Guitton et al, 2007). Finally, extended imaging conditions (Rickett & Sava, 2002;Sava & Fomel, 2006;Sava & Vasconcelos, 2011) provide information about the wavefield similarity for different space and/or time lags and can also be used to discriminate the backscattered energy. Kaelin & Carvajal (2011) In this article we analyze the information carried by the backscattered energy in the extended images.…”
Section: Introductionmentioning
confidence: 99%
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“…This type of decomposition is costly since it operates on individual wavefields characterized by complex multipathing. In contrast, the methods operating after the imaging condition decompose the images themselves which are represented as a function of space and additional parameters, typically refered to as extensions (Rickett and Sava, 2002;Fomel, 2003, 2006;Sava and Vasconcelos, 2011). In the end, the various classes of methods lead to similar representations of the angle-dependent reflectivity represented by the so-called scattering matrix.…”
Section: Introductionmentioning
confidence: 99%
“…An alternative way of constructing angle-dependent reflectivity is based on common-image-point-gathers (CIP) selected at various positions in the subsurface. As pointed out by Sava and Vasconcelos (2011), CIPs are advantageous because they sample the image at the most relevant locations (along the main reflectors), they avoid computations at locations that are not useful for further analysis (inside salt bodies), they can have higher density at locations where the structure is more complex and lower density in areas of poor illumination, and they avoid the depth bias typical for gathers constructed as a function of the depth axis. In this paper, we focus on angle decomposition using extended CIPs.…”
Section: Introductionmentioning
confidence: 99%