Acquisition method and device for seismic exploration of a geologic formation by permanent receivers set on the sea bottom
1 Assignment
0 Petitions
Accused Products
Abstract
A method and device for seismic exploration of a subsea geologic formation by pickups set on the sea bottom and intermittently connectable to active data acquisition stations (11) brought nearby. Permanent passive reception stations (1) comprising a heavy pedestal provided with housings for seismic pickups (geophones (6), hydrophone (7)) which receive acoustic or seismic signals from the underlying formation are arranged at the bottom of the water body. When collection sessions for the signals received by the pickups are scheduled, mobile active acquisition stations (11) connected to permanent passive reception stations (1) are positioned at the bottom of the water body. The signals picked up are then recorded, for the time required to carry out at least one session of acquisition and recording of the acoustic or seismic signals received by the passive stations in response to the emission of seismic waves by one or more seismic sources. The mobile active acquisition stations (11) are thereafter recovered at the surface and the records acquired by each one are transferred to a central collection laboratory.
53 Citations
55 Claims
-
1-17. -17. (canceled)
-
18. A method of seismic exploration of an underwater geologic formation comprising:
-
laying, at a bottom of a water body, at spaced apart locations at least one passive reception stations and locating respective positions of each passive reception station in relation to known positions at a water surface, each passive reception station including pickups coupled to the geologic formation for receiving geologic formation;
laying, at the bottom of the water body, in a vicinity of the at least one passive reception stations, at least one active acquisition station which acquires and records signals received by the pickups of the at least one passive reception station in a vicinity thereof coupled thereto and with the geologic formation, for a time required to carry out at least one acquisition and recording session of the signals; and
transferring data accumulated by each active acquisition station to a central collection laboratory. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
-
- 42. A system for providing seismic exploration of an underwater geologic formation, comprising at least one passive reception station each passive reception station comprising a pedestal for providing deployment on a bottom of a water body, housing containing seismic pickups and an electrical connector connected by electric conductors to the seismic pickups, at least one active stations for connection to the at least one passive reception station, each passive reception station comprising an electronic unit for acquiring and storing seismic signals received by the pickups, a power supply and at least one electrical connector for connecting, by a cable the electronic unit to the electrical connector associated with each passive reception station.
- 44. A system for providing seismic exploration of an underwater geologic formation, comprising at least one passive reception stations, each passive reception station comprising a pedestal for providing deployment on a bottom of the water body and to couple pickups with the geologic formation, at least one active station for connection to the at least one passive reception stations, for a time required to carry out at least one acquisition and recording session of seismic signals received by the pickups, each pickup comprising an electronic unit for acquiring and storing of the seismic signals and a power supply, the pedestal including a cavity for receiving the pickups, which are connected to the electronic unit by a cable.
-
51-52. -52. (canceled)
-
55-57. -57. (canceled)
Specification