Sub Salt

Sub-Salt
As discussed in the sections on More Azimuths, sodium chloride presents significant barriers to seismic penetration, and creates various complex noise that be knockout or impossible to remove in the processing of pompous (narrow-azimuth) surveys.
 
In the  boneheadedwater Gulf of Mexico, offshore Brazil and West Africa, concentre is changing from traditional sub-salt to deeper pre-salt targets. Salt intrusions within the overburden are allocthonous (have migrated through sedimentary layers because of tectonic and compaction forces), and are in general somewhat laterally discontinuous. Seismic acquisition and processing solutions essential deal with locations that variously allow geophysicists to see around the edges of salt features or below salt features, and these challenges are generically referred to as sub-salt.
 
In contrast, regionally-extensive salt layers can be autocthonous (in the location where they were in the first place deposited), obscure very deep (pre-salt) sedimentary targets for hydrocarbon exploration, and require pick seismic acquisition and processing solutions. A fundamental eject is  bode penetration; one of the hallmarks of GeoStreamer data. So pre-salt exploration go forth expectably combine GeoStreamer GS acquisition applied to survey templates that also come through larger azimuth information.




 
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Frequency spectra comparison of conventional hydrophone-only standard (black) and GeoStreamer (red) data using a log frequency scale. The corporeal improvement in low frequency content improves signal penetration in areas affected by salt or basalt in the overburden.
 

Acquisition

Modern solutions to seismic imaging in sub-salt and pre-salt provinces requires system acquisition of diverse azimuths and offsets, long offsets, flexible multi-vessel operations, very deep signal penetration, the recovery of broadband frequency information, dense 3D spatial sampling, uniform target illumination, and sophisticated processing and imaging...If you urgency to get a full essay, order it on our website: Orderessay



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