Description

Introducing the newest addition to our seismic line: the GeoEel LH-16 Solid Streamer from Geometrics. Built on our experience and success with the popular GeoEel Solid digital streamer, the LH-16 ultra-high resolution streamer (UHR) expands horizons with up to 16 kHz sampling rate combined with sub meter group intervals for a solid design capable of delivering higher resolution data than ever before.

At only 44.5mm in diameter, the LH-16 is easy to deploy, easy to transport and easily shipped by air. The 100% solid construction coupled with our proprietary polymer hydrophone design eliminates bulge waves and other cable-borne noise typically seen with any liquid or gel streamer. The streamer system communicates via 100 mbps Ethernet using the Geometrics CNT-2 Controller, our long standing field proven and user friendly acquisition software. Designed by Geometrics, the GeoEel LH-16 is a product of over 50 years’ experience as an industry leader in rugged, reliable and well-supported instrumentation.

 

Features and benefits

  • 16 channel digital sections: Better quality data, fewer connections, less time deploying and troubleshooting.
  • Wide bandwidth for more applications: Sample as low as 0.062ms for surveys that require the highest resolution.
  • Easily upgraded to 3D: 4 streamer network box allows for 3DHR coverage on smaller vessels of opportunity.
  • Light and easy to handle: Only 44.5 mm diameter at 1m, 1.56m, 3.125m, 6.25m and custom group interval options. Contact us for more options.
  • 100% solid construction: Ultra quiet with minimal tow noise, environmentally friendly, non-flammable and easily shipped by air.
  • Full-featured yet simple: No 30-day training program required.
  • Reliable topside equipment: Easy to use with any PC and standard Ethernet.
 

Technical Details

GeoEel LH-16 Digital Streamer Specification List

A/D Converter Modules

  • Channels: 16 per A/D module.
  • Sample intervals: 1/16, 1/8, 1/4, 1/2, 1, 2 ms.
  • Programmable gain: x1, x4, x10, x40, x100.
  • Anti-alias filter: Stop band attenuation of 105 dB above Nyquist.
  • Maximum input range: 1.45 Vrms
  • Resolution: 24 bits including sign.
  • Input impedance: 127 kOhms, paralleled by 2.2 nF.
  • Dynamic range: >120 dB typical @ 16 Khz.
  • Common mode rejection: >110 dB.
  • Total Harmonic Distortion: < 0.001 typical at 100 Hz, full scale input, 0 dB gain.
  • Record length: Up to 30,000 samples.
  • Dead time: 10 ms with max average data rate of 2.1 M samples/s (dead time is 15% of recording time with 160 channels @ 16 kHz).
  • Continuous recording mode: Available, with GPS synchronization.
  • Noise floor: TBD.
  • QC tests: Leakage and capacitance of hydrophone elements, noise, DC offset, harmonic distortion and gain similarity.
  • Power consumption: 225 mW/channel.
  • Calibration oscillator: 1-250 Hz, 0.3 μV to 600 mVrms
  • Dimensions: DIA: 44 mm; L: 330 mm.
  • Weight: 900 g.
  • Packaging material: Titanium.
  • Connectors: 38-pin custom Glenair.

Hydrophone Sections

  • Number of channels: 16 per section.
  • Group interval: 0.92, 1.5625, 3.125, or 6.25m.
  • Hydrophones per group: 2 or 6, depending on group interval.
  • Group sensitivity: -194 + 1.5 dB re 1 V/mPa.
  • Low cut filter: 10 + 0.5 Hz (100 and 50 m); 15 + 1 Hz (25 m and 12.5 m).
  • Hydrophone type: Proprietary polymer.
  • Bird coil: ION Model-578 compatible.
  • Operation depth: 30 m.
  • Diameter: 44.5 mm.
  • Weight: ~156 kg / 100 m.
  • Strain member: Zylon.
  • Working load: 560 kg.
  • Minimum bend radius: 1 m.

Tow Cable

  • Weight: 0.5 kg/m.
  • Strain member: Kevlar.
  • Working load: 900 kg.
  • Diameter: 18.5 mm.

Stretch and Vibration Isolation Section

  • Length: 10 or 25 meters.
  • Diameter: 41 mm (stretch) or 44.5 mm (isolation).
  • Ballast fluid: Gel (stretch only).
  • Stretch ratio: 15% (stretch only).
  • Bird coil: ION Model-578 compatible (vib section only).
  • Working load: 560 kg.
  • Strain member: Zylon (isolation), Vectran (stretch).

Streamer Power Supply Unit

  • Power Requirements: 115/230 VAC, 3/1.5 Amp max, 50/60 Hz.
  • Voltage to Streamer: 36-60 VDC.
  • I/O Communications: I/O Communications: 100Base TX Fast Ethernet, IEEE 802.3 compliant.
  • Trigger Requirements: Isolated input, positive or negative TTL.
  • Testing: Cable leakage and resistance.
  • Optional Auxiliary Inputs: 8 analog channels with 24-bit resolution.
  • Ethernet Connection: RJ-45.
  • Trigger Connection: BNC.

Controller

PC-based, running Geometrics CNT-2 software. Multiple shot and gather windows, bar graph noise displays, windows for shot timing, gun energy, brute stack, tape status, spectral analysis. Auto-switching between storage devices, dual tape writing. Supports multiple printers. Full log kept of all parameter changes. Integrates navigation, gun, and bird data into SEG-D or SEG-Y header.

Note - All Specifications are preliminary and subject to change without notice
 

TYPICAL USES

  • Windfarm development
  • Geohazard assessment
  • Fault mapping
  • Hydrocarbon and mineral exploration
  • Tectonics and marine geology studies
  • Site characterization
  • Gas hydrate exploration
 

Resources