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MINI-STREAMER, 8 CH (2011)

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1.  8-CHANNEL MINI-STREAMER (2011), SPECIFICATIONS

  Lead-in ..................: 150.00 m
  Active section: 8*6.25m ..:  50.00 m
  Tail .....................:  12.50 m
                              --------
             Total length ..: 212.50 m
             -------------------------

  Deck cable length: 27 m

  Cable diameter, lead-in:  14 mm
  Cable diameter, tail:     32 mm

1.1  Power consumption

The streamer is powered by Geometrics DHA-7 Battery Pack, P/N: 0060165-01. It consists of two 5 Amp-hour batteries. Each hydrophone preamplifier draws approximately ±10.8 mA per channel. An 8-channel streamer can be powered continuously for approximately 58 hours (5 Amp-hours divided by 86.4 mA (10.8ma *8 channels)).

2.  STREAMER GEOMETRY REQUIREMENTS

3.  RECORDING SYSTEM SPECIFICATIONS

This is a voltage input amplifier.

A charge amplifier is normally used with the Mini-Streamer. This is a low-impedance, current input type amplifier, with a fairly low output impedance (suitable for connection to e.g. GEODE and similar types of seismographs).

4.  SEISMIC SOURCE (TYPICAL)

4.1  Primary use

The Mini-Streamer will most often be used as a supplement during Ocean Bottom Surveys. In this type of survey, the recording instruments are first put on a gridded line on the ocean bottom. Then the ship turns and fires the seismic energy source over the same line. Operating with offsets (distance between source and first recorder) of tens of kilometres, sometimes several hundred kilometers, the source must be able to output low-frequency, high amplitude signals. In practice, several high-volume airguns are used. The acoustic signal shape of this source is not ideal for the Mini-Streamer, but as a supplementary data acquisition system we just have to make do ...

4.2  Secondary use

Shallow seismics, using sparker as source.

!Reel for mini-streamer

• Ebinger hose-reels
  • Norwegian representative: Grove Knutsen