Variable-depth streamer : deep towing and efficient deghosting for extended bandwidth

Content Provider	Semantic Scholar
Author	Soubaras, Robert
Copyright Year	2010
Abstract	This paper starts by revisiting the receiver deghosting problem, showing that in order to be optimal in terms of signal-to-noise ratio, it should not performed as a preprocessing stage as it is done usually. A new deghosting algorithm is described, based on computing a migration together with a mirror migration, and performing a joint deconvolution of these two images. It is true amplitude, being able to extract the true deghosted reflectivity, that is the reflectivity that would have been obtained should the water surface be not reflecting. The paper then describes how this new deghosting method allows the revisiting of the slant streamer technique, which was experimented in the 1980’s. The principle is to create a notch diversity at stack level, the deghosting being done by the stack. We revisit this acquisition technique in two ways: firstly, we adapt the depth profile of the streamer to modern streamer length, leading to variable depth streamer rather than slant streamer. Secondly, recognizing that the stack performs an imperfect deghosting, leaving a residual ghost, we perform the residual deghosting with our new deghosting technique. A variable-depth streamer dataset was acquired offshore NW Australia and processed with the proposed deghosting algorithm, showing a very wide bandwidth, with low frequencies down to 2.5 Hz and high frequencies up to 110 Hz.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.cgg.com/technicalDocuments/cggv_0000009973.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article