초록 ▼

An ocean bottom seismic cable recording apparatus comprising a plurality of seismic node casings (1), said node casings being separated from each other by separate stress member sections (2), each stress member section having acoustic decoupling arrangements (3) at each end connecting to said seismi

An ocean bottom seismic cable recording apparatus comprising a plurality of seismic node casings (1), said node casings being separated from each other by separate stress member sections (2), each stress member section having acoustic decoupling arrangements (3) at each end connecting to said seismic node casings (1), and where each seismic node casing comprising an autonomous sensor capsule (5) for sensing and recording seismic data, and wherein the autonomous sensor capsule (5) is removable from said seismic node casing (1), and wherein each seismic node casing (1) further comprising an inner compartment (4) accommodating the autonomous sensor capsule (5).

대표청구항 ▼

1. An ocean bottom seismic cable recording apparatus comprising: a plurality of seismic node casings, said node casings being separated from each other by separate stress member sections, each stress member section having acoustic decoupling arrangements at each end connecting to said seismic node c

1. An ocean bottom seismic cable recording apparatus comprising: a plurality of seismic node casings, said node casings being separated from each other by separate stress member sections, each stress member section having acoustic decoupling arrangements at each end connecting to said seismic node casings, and where each seismic node casing comprising an autonomous sensor capsule for sensing and recording seismic data, and wherein the autonomous sensor capsule is removable from said seismic node casing, and wherein each seismic node casing further comprising an inner compartment accommodating the autonomous sensor capsule. 2. The recording apparatus of claim 1, wherein the autonomous sensor capsule have an outer casing withstanding high water pressure. 3. The recording apparatus of claim 1, wherein the autonomous sensor capsule further comprising means for storing recorded data and a power supply unit. 4. The recording apparatus of claim 1, wherein the autonomous sensor capsule comprises three orthogonal geophones recording in x, y and z directions, a hydrophone, data recording unit and a battery and data storage unit. 5. The recording apparatus of claim 4, wherein at least two battery and data storage units are symmetrically positioned at opposite ends of the autonomous sensor capsule. 6. The recording apparatus of claim 4, wherein the battery and data storage unit after data recording is completed is placed in a docking station for unloading of data and recharging of batteries. 7. The recording apparatus of claim 4, wherein the battery and data storage unit further comprises a removable unit, said removable unit comprising a real time clock, a CPU board and a memory. 8. The recording apparatus of claim 7, wherein the removable unit is adapted to be placed in a docking station for comparing and adjusting the frequency of the real time clock to a reference frequency. 9. The recording apparatus of claim 7, wherein the removable unit is adapted to be placed in a docking station, for programming and re-programming the CPU board and for downloading the data from the memory. 10. The recording apparatus of claim 1, wherein the autonomous sensor capsule and the inner compartment have corresponding shapes so as to provide a close fit of the sensor capsule within the seismic node casing. 11. The recording apparatus of claim 1, wherein the seismic node casing comprises a quick locking and release mechanism for the autonomous sensor capsule. 12. The recording apparatus of claim 1, wherein the seismic node casings have a shape and weight distribution to assure seismic coupling to seafloor sediments. 13. The recording apparatus of claim 1, wherein the seismic node casings have a low profile shape to allow an effective spooling on reels during deployment and recovery. 14. The recording apparatus of claim 1, wherein the seismic node casings comprising holes or openings allowing a hydrophone of the autonomous sensor capsule to be in direct contact with surrounding water. 15. The recording apparatus of claim 1, wherein the seismic node casings having integrated flexible joints allowing bending of said node casings during spooling on reels. 16. The recording apparatus of claim 1, wherein the seismic node casings are disconnectable from the acoustic decoupling devices. 17. The recording apparatus of claim 1, wherein the stress member sections are acting as weights in order to assure adequate seismic coupling of the seismic node casing to the seafloor. 18. The recording apparatus of claim 1, comprising additional weight members attachable to the stress member sections or seismic node casings in order to stabilise the ocean bottom seismic cable recording apparatus during deployment. 19. The recording apparatus of claim 1, wherein the seismic node casings with the acoustic decoupling devises are attached via flexible connectors to the stress member sections such that they can freely rotate around their longitudinal axis preventing any bending or twist during deployment or recovery. 20. The recording apparatus of claim 1, wherein the autonomous sensor capsule comprises means for measuring and recording an outside and/or inside temperature in a location at the sea bottom. 21. The recording apparatus of claim 1, wherein the ocean bottom seismic cable recording apparatus is attached to a surface buoy by a lead-in wire after deployment. 22. Method for deployment of an ocean bottom seismic cable recording apparatus as defined in claim 1, wherein said method comprising: deploying said ocean bottom seismic cable recording apparatus at the sea bed from at least one reel arrangement on a vessel, andautomatically or manually inserting the autonomous sensor capsules into the seismic node casings before said seismic node casings are deployed into the sea. 23. Method of claim 22, wherein the autonomous sensor capsule is inserted automatically into the node casing by an industrial robot. 24. Method for recovery of an ocean bottom seismic cable recording apparatus as defined in claim 1, wherein said method comprising: spooling said ocean bottom seismic cable recording apparatus onto at least one reel arrangement,manually or automatically removing the autonomous sensor capsules from the seismic node casings during spooling, andretrieving the seismic data from said autonomous sensor capsules. 25. Method of claim 24, further comprising placing the sensor capsule in a docking station for unloading of data and recharging of batteries. 26. Method of claim 25, wherein the procedure of docking the battery and data storage unit is managed by an industrial robot. 27. Method of claim 24, further comprising removing the battery and data storage unit from the sensor capsule, and placing the battery and data storage unit in a docking station for unloading of data and recharging of batteries. 28. Method of claim 24, wherein the removable unit is placed in a docking station and the frequency of the real time clock are compared with and adjusted to a reference frequency. 29. Method of claim 28, wherein the procedure of docking the removable unit is managed by an industrial robot. 30. Method of claim 24, wherein the removable unit is placed in a docking station, the CPU board programmed or re-programmed and data downloaded from memory. 31. Method of claim 24, wherein the autonomous sensor capsule is removed automatically from the node casing by an industrial robot.