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    OBS SURVEYS, BRAZIL, 2018-19    

     Seismic data acquisition using RV "Alpha-Crucis", University of São Paulo, Brazil

UNIVERSITY OF BERGEN
Department of Earth Science
 Allé gt. 41, N-5007 Bergen, Norway 
             
0.1   DRAFT - request for comments - 26 March, 2017 OM OM -
VER. STATUS CHANGE DATE BY CKD APPD

INTRODUCTION


A geophysical data acquisition program is considered in Brazilean waters, using R/V "Alpha-Crucis", as a collaboration between these parties:

This web page describes technical details in the seismic instrumentation systems.

ABOUT RV "ALPHA-CRUCIS"


Click to see informal presentation of RV Alpha-Crucis.

Click to see informal RV "Alpha-Crucis" YouTube presentation.

  • Named after the star that represents Sao Paulo on the Brazilian flag
  • ".... Luiz Nonnato, engineer of the Instrumentation Laboratory of the Oceanographic Institute and responsible for the design of the vessel's new equipment." Quote from this article (translated into English).
  • Built: 1973 (refit 2012)
  • Commisioned: 2012
  • Length: 64 m
  • Beam: 11 m
  • Draft (max): 4.05 m
  • Gross tonnage: 1890 Ton
  • Crew: 19
  • Scientist: 21
  • Endurance: 70 days
  • Wikipedia article
  • On "Marine Traffic", vessel tracking page:

GEOPHYSICAL INSTRUMENTATION


List of required instrument systems


Item no. Name Status Description / Setup Backup required?
[TBD = To Be Determined]
1 Navigation system / Survey Computer TO BE DETERMINED. LIST OF SPECIFICATIONS MUST BE MADE.
CANDIDATES FOR EVALUATION:
  1. EIVA NaviPac
  2. Triggerfish (Integrated Navigation System)

Diff GPS:

  • To be determined
TBD
2 Auto pilot (and / or: Helmsman display) TO BE DETERMINED. CANDIDATES FOR EVALUATION:
  1. Simrad AP80
TBD
3 Airgun control system TO BE DETERMINED. CANDIDATES FOR EVALUATION:
  1. Teledyne RTS Hotshot Gun Controller - available for rental at TTS
    Information from manufacturer Teledyne: "The Hotshot 4 can be configured with the optional RTS GPSSYNC hardware that will give the unit GPS based time. In this operational configuration, the GPS time is used to time stamp the shot points that are recorded in the shot log down to the mS, the time recorded is the trigger time. This log file is recorded by the Hotshot software for later use."
TBD
4 Mini-streamer
  • Manufacturer: Geometrics
  • Model: MicroEel
  • Type: 8-channel
TBD
5 Recording for Mini-streamer
  • Manufactirer: Geometrics
  • Model: GEODE
  • Sample interval: 2 ms
  • Recording time: To be determined (TBD)
  • Data format: SEG-Y
  • Filter settings: Only anti-alias filter (automatically adapted to sample rate).
TBD
6 Gravitymeter TBD
7 Magnetometer TBD
8 Time stamping equipment (if required - Gun Controller might include such feature) TBD
9 Airguns
  • 4 ea, Bolt model 1500, each 1200 inch3 , in total 4800 inch3
  • Air pressure, firing moment: 138 Bar = 2000 psi
  • Source depth: To be determined
TBD

Rental companies


MISC


Vessel navigation, steering


Instrumentation


Diesel fuel tank for compressor


A compressor with diesel motor would require fuel tank of, say, 2 m3, to keep it running for 24 hours, before resupply would be necessary. Such fuel tanks can be of type shown below. They could be placed upon container that houses compressor - provided vessel structural strength and stability concerns are adressed first.

Click to enlarge.

Example 4000 liter Heli-fuel tank, manufactured by Hoover Ferguson

Click to enlarge.

Example 2900 liter Heli-fuel tank, manufactured by Hoover Ferguson

DNV certified tanks from MODEX: Model "TC20 2000L Vertical Chemical" could be considered ..... Quote: "MODEX is a leading manufacturer and provider of DNV certified CCU’s [= Cargo Carrying Units], cabins and well service equipments for offshore oil & gas operations."

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Page last modified on March 26, 2018, at 08:55 AM
Electronics workshop
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