Seismic prospecting method using vehicles moving in opposite directions
First Claim
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1. A seismic prospecting method for use in particular for offshore seismic prospecting, comprising the steps of:
- performing successively a plurality of emission and reception cycles each including emitting acoustic waves by means of at least one source of acoustic waves initiated at each position of a series of separate successive positions, and receiving the acoustic waves reflected by different reflecting layers of subsoil by means of at least one movable reception device having an assembly of separate receivers spaced apart from one another;
recording said received acoustic waves; and
combining recordings of reflections from identical positions on said reflecting layers, so as to obtain multiple coverage thereof at a degree depending on the number of times of said reflections from an identical part on said reflecting layers;
said successive emission and reception cycles being achieved by associating said source with a first vehicle and said reception device with at least one second vehicle, and moving said first and second vehicles in opposite directions at unequal speeds along different paths with the angle formed by the advancing direction of a vehicle associated with said source and the advancing direction of a vehicle associated with said reception device being greater than 90°
, whereby components of said advancing directions are directed diametrically opposite to each other.
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Abstract
A seismic prospecting method comprising the use of at least two vehicles for moving an acoustic wave emission assembly and a reception assembly such as a seismic streamer. The method consists in performing successive cycles of emission of acoustic waves, of reception and of recording of the acoustic waves coming from reflecting interfaces of the subsoil and combining the recording so as to provide multiple coverage. The vehicles follow paths such that the angle formed by the respective advancing directions remains greater than or equal to 90° in absolute value.
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10 Claims
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1. A seismic prospecting method for use in particular for offshore seismic prospecting, comprising the steps of:
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performing successively a plurality of emission and reception cycles each including emitting acoustic waves by means of at least one source of acoustic waves initiated at each position of a series of separate successive positions, and receiving the acoustic waves reflected by different reflecting layers of subsoil by means of at least one movable reception device having an assembly of separate receivers spaced apart from one another; recording said received acoustic waves; and combining recordings of reflections from identical positions on said reflecting layers, so as to obtain multiple coverage thereof at a degree depending on the number of times of said reflections from an identical part on said reflecting layers; said successive emission and reception cycles being achieved by associating said source with a first vehicle and said reception device with at least one second vehicle, and moving said first and second vehicles in opposite directions at unequal speeds along different paths with the angle formed by the advancing direction of a vehicle associated with said source and the advancing direction of a vehicle associated with said reception device being greater than 90°
, whereby components of said advancing directions are directed diametrically opposite to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification