Augmentation method and apparatus for conducting underwater seismic surveys

A technique of seismic exploration, equipment, applied in the direction of seismology, seismology, geophysical surveying, etc. for areas covered by water, to achieve economical results in maintenance and operation

Inactive Publication Date: 2011-12-07
KIETTA
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The patent therefore only deals with measurements performed when the hydrophone array is fixed on the sea floor

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  • Augmentation method and apparatus for conducting underwater seismic surveys
  • Augmentation method and apparatus for conducting underwater seismic surveys
  • Augmentation method and apparatus for conducting underwater seismic surveys

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[0077] The following is a description of the apparatus of the present invention and its method of implementation in a marine seismic survey application, it being understood that the present invention is equally applicable to surveying any type of water, including surveying under polar ice caps with several adaptations .

[0078] refer to figure 1 , the device of the invention and its implementation method comprise several submerged seismic cables positioned parallel to each other, also called lines or even "streamers", referenced 1 to 10 . The cable is an adaptation of a cable type known per se, except that its buoyancy is essentially zero and its mechanical and hydrodynamic architecture is adapted to its almost zero speed in water, so that only very low tension and very low hydrodynamic resistance. Each cable supports multiple seismic sensors, such as hydrophones or even hydrophones and accelerometers.

[0079] At each of the two ends of each cable there is fixed cable pos...

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Abstract

Enhanced method and device for aquatic seismic prospecting are provided. In the method and the device of the type: - a submerged mobile seismic source is positioned, able to create one or more disturbances transmitted through the aquatic medium in the form of waves able to be reflected on the bottom of the water and the different deep underlying geological layers; - at least one cable, and preferably several, provided with a plurality of sensors is positioned, able to collect said reflected waves; - said seismic source is triggered with one or more repeats thus creating one or more disturbances; - said reflected waves are picked up using said sensors.

Description

technical field [0001] The present invention relates to a method and apparatus for underwater seismic surveying. The general principle of this type of survey involves the placement of a series of parallel and submerged seismic cables, or lines, or "streamers" in place, with spaced over each of them such as hydrophones and / or Sensors such as geophones. The cables are then towed by one or more ships at a speed of approximately 5 knots (approximately 9 km / h) and held apart by diverging plates called parvanes. Background technique [0002] According to this same principle, one or more other ships, called "seismic sources", which are equipped with devices (usually in the form of air guns) capable of generating waves in the marine environment, are moved at a distance from the sensor cables. The waves formed in a suitable manner travel to the sea bottom, then travel to and are reflected by different geological layers, and are finally collected and measured by said submerged senso...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/38
CPCG01V1/3808G01V1/201G01V1/38G01V1/3817
Inventor 米歇尔·马林
Owner KIETTA
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