Seismic data acquisition system using acquisition stations set on the sea bottom
First Claim
1. ) A system intended for acquisition of seismic data relative to a subsea underground formation, comprising a central control and acquisition station (CCRU), several relay buoys (RCB) suited to float on the surface of the water and comprising S each a control module (CPU), a positioning signal receiver (Rx) using GPS type satellite positioning for example, and radio transmission means (VHF) for exchanging data with central control and acquisition station (CCRU), a plurality of bottom seismic acquisition stations (DSAU) comprising each a sealed body including a pressure detector (PS) and associated with a streamlined part or boom provided with a housing for seismic receivers (SRU), suited to descend under the effect of gravity to the bottom of the water mass and to enter it so as to couple seismic receivers (SRU) with the underground formation, each acquisition station (DSAU) comprising a control unit (UC), and a device (DAM) intended for acquisition of seismic data received by seismic receivers (SRU) in the boom and by pressure detector (PS), characterized in that the relay buoys and bottom seismic acquisition stations (DSAU) are each provided with an acoustic transmission device including an acoustic transponder (AT), an acoustic positioning module (PLM) and an acoustic communication module (ACM) for exchanging therewith, by modem via transponder (AT), either positioning data or control data from central station (CCRU) or seismic data acquired by the acquisition device, to be transmitted to said central station (CCRU).
1 Assignment
0 Petitions
Accused Products
Abstract
System designed for acquisition of seismic data by means of acquisition stations set on the bottom of a water mass.
The system comprises bottom acquisition stations (DSAU) combining a streamlined boom suited to stick into the bottom and thus to couple several seismic receivers with the underlying formation, and a scaled body for electronic data acquisition and communication modules. These acquisition stations (DSAU) are put into water and go down to the bottom under the effect of gravity. Several relay buoys (RCB) are positioned at the surface, each with a GPS positioning module, a radio link with a central station (CCRU), on a ship for example, and modules intended for acoustic communication with bottom acquisition stations (DSAU), used both to determine the position of these stations in relation to the relay buoys and to exchange control data and seismic data (good running order data or possibly seismic traces acquired if the conditions lend themselves thereto).
Application: seismic prospecting or monitoring of an underground formation.
-
Citations
16 Claims
- 1. ) A system intended for acquisition of seismic data relative to a subsea underground formation, comprising a central control and acquisition station (CCRU), several relay buoys (RCB) suited to float on the surface of the water and comprising S each a control module (CPU), a positioning signal receiver (Rx) using GPS type satellite positioning for example, and radio transmission means (VHF) for exchanging data with central control and acquisition station (CCRU), a plurality of bottom seismic acquisition stations (DSAU) comprising each a sealed body including a pressure detector (PS) and associated with a streamlined part or boom provided with a housing for seismic receivers (SRU), suited to descend under the effect of gravity to the bottom of the water mass and to enter it so as to couple seismic receivers (SRU) with the underground formation, each acquisition station (DSAU) comprising a control unit (UC), and a device (DAM) intended for acquisition of seismic data received by seismic receivers (SRU) in the boom and by pressure detector (PS), characterized in that the relay buoys and bottom seismic acquisition stations (DSAU) are each provided with an acoustic transmission device including an acoustic transponder (AT), an acoustic positioning module (PLM) and an acoustic communication module (ACM) for exchanging therewith, by modem via transponder (AT), either positioning data or control data from central station (CCRU) or seismic data acquired by the acquisition device, to be transmitted to said central station (CCRU).
-
13. ) A method intended for seismic exploration or monitoring of a subsea underground formation, comprising:
-
installing, at the bottom of the water mass, a series of seismic signal acquisition units comprising a streamlined part or boom provided with a housing for at least one seismic receiver and an acquisition module for the seismic data received by each receiver, each acquisition unit being suited to go down, under the effect of gravity, to the bottom of the water mass and to enter it so as to couple the seismic receivers with the underground formation, determining the position of each acquisition unit installed at the bottom, carrying out seismic operations with emission of waves by an underwater seismic source, reception of the waves reflected by discontinuities of the underground formation in response to the waves emitted in the formation, collection of the data received by the receivers of each acquisition unit, and recovery, by a central station (CCRU), of the seismic data acquired by each acquisition unit, characterized in that it comprises exchange, between the relay buoys and bottom seismic acquisition stations (DSAU), of either positioning data or control data from central station (CCRU) or seismic data acquired by bottom acquisition devices (DSAU), to be transmitted to said central station (CCRU) by means of sets in each of said bottom acquisition devices (DSAU) and each relay buoy comprising an acoustic transponder (AT), an acoustic positioning module (PLM) and an acoustic communication module (ACM) using a modem. - View Dependent Claims (14)
-
Specification