Seismic node, method and use thereof for ocean bottom seismic surveying
AssigneeMagseis Fairfield Asa
InventorsJan GATEMAN, Nils HEIEREN, Liam James FLOOD
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Abstract
A seismic node (1) for an ocean bottom seismic survey comprising: At least one seismic sensor capsule (2), a seafloor casing (6) comprising a lower surface configured to make contact with a seabed. The seismic sensor capsule (2) comprises first engagement means; the seafloor casing (6) comprises second engagement means (10). The first and second (10) engagement means are adapted to releasable engage with each other whereby the seismic sensor capsule (2) is releasably fastened to the seafloor casing (6). The seismic sensor capsule (2) is adapted to be removed from the seafloor casing (6) after a certain time T. The seafloor casing (6) is configured to be left permanently on the seabed.
Claims14
1-13. (canceled)
A seismic node for an ocean bottom seismic survey, the seismic node comprising:
- at least one seismic sensor capsule comprising a first capsule surface and an opposite second capsule surface;
- and
- a seafloor casing comprising an upper surface and an opposite lower surface configured to make contact with a seabed,
- wherein the seismic sensor capsule comprises first engagement means, and that the seafloor casing comprises second engagement means,
- said first and second engagement means are adapted to fit with each other whereby the seismic sensor capsule is releasably fastened to the seafloor casing,
- said seismic sensor capsule is adapted to be removed from the seafloor casing after a certain time T and for being transported by a vehicle to a surface of the ocean, while the seafloor casing is configured to be left permanently on the seabed.
A method for performing an ocean bottom seismic survey the method comprising:
- placing a seismic node comprising a seafloor casing and at least one seismic sensor capsule on a seafloor, wherein the seismic sensor capsule(s) is/are releasably attached to the seafloor casing, and that the seismic sensor capsule(s) is/are removed from the seafloor casing by a vehicle, after a certain time T has passed, said seismic sensor capsule(s) is/are transported to a surface vessel where data registered by the seismic sensor capsule(s) are extracted from the seismic sensor capsule(s), or the data are extracted while the seismic sensor capsule(s) is/are still in the ocean, while the seafloor casing is left permanently at the same place of the seabed, said seafloor casing is a stationary and immovable unit.
Dependencies are inferred from the claim text.