Marine Reflection Seismics

The marine reflection seismic surveys are carried out with an extensive equipment, which will be controlled and steered from board of the research vessel. It can be categorized into three main groups:

1.Seismic source and control unit

Air gun cluster Source: BGR

The air guns are controlled with a BigShot gun controller Source: BGR

2. Seismic cable and acquisition unit

Fig. 6: Large winch on the right side with a maximum of 3900 meters of seismic cable. Two small winches with each 1500 meters of seismic cable on the left side. The construction of a second large winch is ordered at present Source: BGR

Seal 408 acquisition unit. BGR owns also a Seal 428 acquisition unit Source: BGR

Deployment of a paravan for 3D seismic data acquisition Source: BGR

3. Navigation and steering unit

Transponder Source: BGR	Bird Source: BGR
Transponder system (left) for the precise localization of the streamer and depth controller, so-called “bird” (right hand side, orange device). The green unit is a recovery unit that prevents a sinking of the streamer deeper than 50 meters.

Fig. 9: Navigation system Spectra: For the 3D seismic data acquisition, we need a precise knowledge of the position of the streamers and sources at all times. We also control the track of the research vessel by means of the navigation system Source: BGR

Our reflection seismic equipment can be used in several setups:

	2D	3D
Sources	1 x GI Airgunup to 18 x G-Guns	2 x GI Aiguns up to 2 x 4 G-Guns
Volumes	¾ Liter up to 51 Liter	2 x ¾ Liter up to 2 x 16,5 Liter
Cable	Digital streamer up to 7800 meter	Digital streamer up to 2 x 3900 meter
Acquisition unit	SEAL 428 und SEAL 408	SEAL 428
Navigationssystem	Spectra	Spectra
Channel distance	12,5 Meter