Geometrics GeoEel Solid LH-16™ Digital Streamer

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.

Geometrics GeoEel Solid LH-16™ Digital Streamer Seismographs

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.

TYPICAL USES

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

Technical Details

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