Seismic imaging in the presence of basalts wide-angle profiling in the Faroe Basin

Masotti, R.; Barton, P. J.; Richardson, K. M.; Cameron, Ross

doi:10.3997/2214-4609.201408633

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“…To overcome this problem, different approaches have been suggested. One of them is the use of converted waves to image beneath the basalt (Joppen & White 1990;Li & MacBeth 1996;Masotti et al 1996). Converted waves generated at the interface between formations with strong velocity contrast may contain more energy than the standard P transmitted waves, especially at long offsets.…”

Section: Introductionmentioning

confidence: 99%

Faeroe Sub-Basalt Seismic Imaging - a New Iterative Time Processing Approach

Barzaghi¹,

Calcagni²,

Passolunghi³

et al. 2001

63rd EAGE Conference &Amp; Exhibition

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Converted wave terminologyConversion occurs each time a wave impinges at non-normal incidence on an impedance contrast, and is accompanied by a partition of energy between different wave types (P, S, reflected, transmitted). Some of the possible conversions have such a low energy content that they can be considered negligible for seismic imaging purposes. Moreover, marine acquisition with a towed streamer requires that a P wave must arrive at the receiver. Among the many different types of waves analysed, some conversions appear to be particularly attractive:• PSSP: means P wave down to top basalt, conversion to S wave at top basalt, S propagation and reflection in subbasalt layers up to top basalt, conversion to P wave at top basalt and propagation up to receivers. This is the symmetrical converted wave (for a 1D layered medium, the downgoing and upgoing travel paths have the same wave mode travelling in the same layer) with the minimum number of conversions. Symmetrical waves are very interesting, because they allow the use of traditional processing tools developed for PP waves. • PSP: means P wave down to an impedance contrast, S wave reflected at the contrast up to sea bottom, conversion to P wave at sea bottom and propagation to

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Section: Introductionmentioning

confidence: 99%