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Digital Marine Seismic Streamer System

Digital Marine Seismic Streamer System. Built as joint venture between SubSea, Inc., and Geometrics, Inc. Digital Marine Seismic Streamer System. Suitable for wide range of surveys Oil and Gas, Gas Hydrates High-resolution engineering surveys Large channels, up to 240

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Digital Marine Seismic Streamer System

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  1. Digital Marine Seismic Streamer System Built as joint venture between SubSea, Inc., and Geometrics, Inc.

  2. Digital Marine Seismic Streamer System • Suitable for wide range of surveys • Oil and Gas, Gas Hydrates • High-resolution engineering surveys • Large channels, up to 240 • Small channels, hand deployed • Sub-Bottom profiling • Uses any impulsive source

  3. Digital Marine Seismic Streamer System • Less noise, better quality data: • Digital Streamer Means Better Quality Data, Less Time Deploying System • Comparable In Price To Analog Systems • 8 kHz bandwidth • 4 ms to 1/16 ms Sampling Means Suitability For More Kinds of Surveys • 24-Bit, 110 dB Dynamic Range

  4. Digital Marine Seismic Streamer System • Environmentally Friendly and Easy to Deploy: • Light Weight, Easy To Deploy On Small Boats • Small Diameter (38 mm, 1.5") Means Easy Deployment by Hand or With Small Winches • Easily Shippable, No Special Environmental Requirements, Filled with Inert Silicon Oil • Rugged, 1/8" Wall Thickness, Can Be Used As Bay Cable, Transition Zones

  5. Digital Marine Seismic Streamer System • Works with Standard Birds • Uses Geometrics CNT-1 PC Controller • Separate Windows Display Shots, Gathers, Trigger Timing, Noise, Gun Energy, Tape Status, Alarms • Real-Time Brute Stack • Multiple Storage Devices • Integrates Data from Guns, Nav, Birds • Drives Multiple Printers • Over 40 installations in operation

  6. Component parts • A/D Modules: • 8 channels per can, up to 240 channels • Expands easily to multiple streamers • Communicate by Ethernet, no custom interface • Easily expand to more channels

  7. Component parts • Active sections: • 8 channels/section • 25, 12.5, 6.25, 3.125, custom groups 12.5m group: 100m section, 16 hydrophones per group 6.25m group: 50m section, 8 hydrophones per group 3.125m group: 25m section, 4 hydrophones per group

  8. Component parts power/interface box: • Trigger • Ethernet to computer • Aux channels • Interface to birds • Capacitance, leakage testing • Interface to streamer

  9. Component parts • Laptop or Desktop Computer • Anything with industry-standard Ethernet • Consider storage solutions • DVD or RAID’s appropriate

  10. Digital Marine Seismic Streamer System • On-Deck Configuration: • Personal Computer • Printer • Data storage • Monitor • Ethernet card(s) • Ethernet cable to PS • Streamer Power Supply • On-Deck Aux Channels • Rugged Deck cable to winch • Optional Repeaters

  11. Digital Marine Seismic Streamer System

  12. Active Section Construction • Active Sections are constructed from • Polyurathane tubing • Hydrophones • Two Vectran strain members • Polypropylene spacers • Polypropylene clamp spacers • Polypropylene spherical floatation • Silicone oil • Power, signal and digital connections • Bird Coils

  13. Active Section Construction • Built to facilitate easy handling • Narrow diameter weighs 1.2 kg/m • Interior floatation counteracts relatively heavy silicone oil

  14. Active Section Construction • Spacers used to stop the streamer from collapsing and are positioned every 1.25m • The spacers are pinned to the Vectran to ensure no slippage

  15. Active Section Construction • Each hydrophone group has a special handling spacer and clamp to ease hand retrieval and limit skin stretch

  16. Active Section Construction • Floatation is added to the interior of the streamer to maintain neutral buoyancy in such a narrow diameter filled with relatively heavy silicone oil

  17. Active Section Construction • Floatation is captured in tubular netting to restrict movement and eliminate noise • Nylon tie wraps are used to connect the floatation to the Vectran to ensure they ‘move’ under load

  18. Active Section Construction • Bird spacers are affixed with epoxy and pins so they won’t slip

  19. Active Section Construction • Service loops are left in both the wiring and the floatation netting to ensure that the internal elements flex without damage under load.

  20. Active Section Construction • Thicker bird collars are available so you can use Digicourse and other standard birds

  21. Software Example Display

  22. Software Features • Fault Tolerant • No Data Loss Even If All Tape Drives Fail • Maintains Data Ordering for Processing • Optimized for Speed • Data can be collected on multiple inputs • Communicates with other devices • navigation • birds, compasses • downhole encoders

  23. Software Features • Separate, Sizeable Windows • Shot • Multiple Simultaneous Gathers • Source Energy, Shot Timing • Noise Window • User definable alarms with adjustable thresholds • Drives multiple plotters for various displays

  24. Typical initial screen showing shot, gather, spectra, observers log, noise and trigger windows

  25. Visual and audiable alarms can be operator selected

  26. Streamer noise, calibrated in micro bars

  27. Digital Marine Seismic Streamer System Detailed Specifications: A-D Converter Module (ADCM): • Number of channels per active section: 8 (plus 1 optional depth sensor channel) • Sample Rates: 1/16 ms, 1/8 ms, 1/4 ms, 1/2 ms, 1 ms, 2 ms, 4 ms • Bandwidth: 1Hz to 8kHz • Programmable Gain: 0 dB, 12dB, 24 dB, 36 dB, 42 dB • Maximum Input Range: ±2.25V • Resolution: 24 Bits including sign • Dynamic Range: 120db Typical @ 1ms • QC Tests: Leakage and capacitance of hydrophone elements, pulse, oscillator, timing. • Power Consumption: Approximately 100 mA at 48 VDC • Calibration Oscillator: 10 Hz to 2 kHz, 1 µvolt to 100 mv AC RMS • Dimensions: 38 mm diameter x 22cm long (1.75" diameter by 8.5") • Weight: 900 grams (2.0 lbs) • Packaging Material: Titanium • Connectors: Waterproof high density stainless steel, 41 pin

  28. Digital Marine Seismic Streamer System Detailed Specifications: Hydrophone Array: Active Section: Number of Channels: 8 maximum per section Number of Sections: Dependent on array, 12 sections for 96 channel Hydrophones per group: User option, 16 typical at 12.5m Hydrophone Type: Benthos RDA Geopoint Depth sensor (optional): ± 2.5 percent accuracy, 0-50 meters Jacket Material: Clear polyurethane, 70 Duro, 3.18mm (1/8") wall thickness Outer Diameter: 38 mm (1.5 inches) Ballast Fluid: Inert, non-polluting silicon oil, 100 cSt Weight: ~1.2 kg/m Break Strength: 1250 kg (2750 lbs) Maximum Tow Speed: ~8 knots recording, ~10 knots steaming, depending on sea state Winch Drum Minimum Diameter: 1.5m

  29. Digital Marine Seismic Streamer System Detailed Specifications: Stretch Section: • Length: 10, 25 or 50 meters standard • Outer Diameter: 38mm, 1.5”. • Compass/Bird Coil: IO Model 587, mounted at center of section • Jacket Material: Clear polyurethane, 70 Duro, 3.18mm (1/8") wall • Outer Diameter: 35 mm (1.375 inches) • Ballast Fluid: Inert, non-polluting silicon oil, 100 cSt • Weight: ~ 45 Kg for 50 meter section • Break strength: 1250 kg (2750 lbs) Tow Cable: • Electrical conductors: 10 twisted pair shielded, 22 awg • Weight: Dependent on length, ~ 25 kg (55 lbs) for 50 meters • Strain member: Kevlar • Break strength 1250 kg (2750 lbs)

  30. Digital Marine Seismic Streamer System Detailed Specifications: Deck Interface and Power Supply (DIPS): • Power Requirements: 115/230 VAC, 3/1.5 Amp max, 50/60 Hz • Voltage to Streamer: 36 – 72 VDC • I/O Communications: 100Base TX Fast Ethernet, IEEE 802.3 compliant • Trigger Requirements: Isolated Input, Positive or Negative TTL, software selectable • Testing: • Continuous monitoring of cable condition for leakage • Continuous monitoring of Ethernet for faults and collisions • Displays: • LCD Display with touch screen • LED's for trigger and Ethernet status • Optional Auxiliary Inputs: 8, Analog channels with 24 bit resolution • Ethernet Connection: RJ-45 • Trigger Connection: BNC

  31. Digital Marine Seismic Streamer System Detailed Specifications: • Controller: • PC based running Geometrics CNT-1 software. • Multiple shot and gather windows • waterfall and bar graph noise displays • windows for • shot timing • gun energy • brute stack • tape status • spectral analysis • Sure-save software protects data loss even with total storage device failure • Files automatically kept in sequential order. Auto-switching between storage device dual tape writing Supports multiple printers Full log kept of all parameter changes. Integrates navigation, gun, bird parameters into SEG-D, SEG-Y or SEG-2 header. PC speed and storage must be adequate for the number of channels and recording parameters

  32. Digital Marine Seismic Streamer System Summary: • Only digital seismic streamer with 8 kHz bandwidth • Only digital streamer with <40mm OD • Only digital streamer that uses inexpensive and reliable Ethernet in the streamer • Only digital streamer filled with environmentally-friendly fluid

  33. Customer Surveys • California State University Long Beach • White Squall Survey – San Francisco Bay • Gulf of Mexico, Entrepid Survey • Geological Survey of Japan, Season 1 • Geological Survey of Japan, Season 2 • Fugro California Survey

  34. CSULB Sea Trials

  35. CSULB Sea Trials • Deploying cable

  36. CSULB Sea Trials • Instrument room

  37. CSULB Sea Trials • Handling system on deck

  38. CSULB Sea Trials

  39. CSULB Sea Trials

  40. White Squall Survey

  41. White Squall Survey

  42. White Squall Survey

  43. White Squall Survey

  44. White Squall Survey

  45. White Squall Survey

  46. Gulf of Mexico Entrepid Survey

  47. Gulf of Mexico Entrepid Survey

  48. Gulf of Mexico Entrepid Survey

  49. Gulf of Mexico Entrepid Survey

  50. Gulf of Mexico Entrepid Survey

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