Seismic data acquisition
AssigneeWesternGeco L.L.C.
InventorsJacques Orban, Simon Frederick Tong
Life of this patent
Estimating the term…
Abstract
A seismic data acquisition technique comprises laying a seismic data cable having a plurality of spaced apart connection nodes and a plurality of sensor strings connected to the connection nodes along a line of the area to be seismically surveyed. Each sensor string comprises ten or more seismic sensors for producing respective output signals representative of a seismic signal received by them. The sensors of the sensor strings are laid out in at least two sets of groups, each group containing several of the sensors and transmitting at least one seismic signal to a connection node, and the sets of groups being disposed along respective spaced apart lines generally parallel to the line along which the seismic data cable is laid.
Claims10
Apparatus for use in seismic data acquisition in a land or transition zone environment, the apparatus comprising:
- at least one seismic data cable which, in use, is laid out along a line of an area to be seismically surveyed, said cable having a plurality of spaced apart connection nodes therealong;
- and
- a plurality of sensor strings connected to said connection nodes, each sensor string comprising a plurality of seismic sensors connected in series and each adapted to produce a respective output signal representative of a seismic signal received thereby;
- wherein each of the plurality of sensor strings is adapted to permit the sensors thereof to be laid out in at least two sets of series-connected groups, each group containing a plurality of the sensors and being adapted to transmit at least one seismic signal to a connection node, and the sets of groups being disposed along respective spaced apart lines generally parallel tote line along which the seismic data cable is laid.
A method of seismic data acquisition, the method comprising:
- laying a seismic data cable along a line of an area to be seismically surveyed, said cable having a plurality of spaced apart connection nodes therealong, and a plurality of sensor strings connected to said connection nodes, each sensor string comprising a plurality of seismic sensors connected in series and each adapted to produce a respective output signal representative of a seismic signal received thereby;
- laying the sensors of each of the plurality of sensor strings out in at least two sets of series-connected groups, each group containing a plurality of the sensors and transmitting at least one seismic signal to a connection node, and the sets of groups being disposed along respective spaced apart lines generally parallel to the line along which the seismic data cable is laid;
- emitting acoustic signals downwardly into the area to be surveyed, for reflection by earth formation beneath the area;
- and
- detecting the reflected signals with the sensors.
Dependencies are inferred from the claim text.