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SUBTECH OBS TESTS

SUBTECH OBS TESTS. Claude LEVEQUE IFREMER Underwater System Department Toulon. Objectives of SUBTECH OBS Project Partners : CGG with IFREMER and Cybernetix. Aims to develop oil reservoir monitoring by 4D ocean bottom seismic method Constraints:

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SUBTECH OBS TESTS

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  1. SUBTECH OBS TESTS Claude LEVEQUE IFREMER Underwater System Department Toulon MARNAUT meeting 22/01/2007

  2. Objectives of SUBTECH OBS ProjectPartners : CGG with IFREMER and Cybernetix • Aims to develop oil reservoir monitoring by 4D ocean bottom seismic method • Constraints: • OBS position, coupling and orientation must be as identical as possible by the time of successive seismic campaigns • Cost reduction is a main condition to develop the market MARNAUT meeting 22/01/2007

  3. Proposed solution (future offsh. oil applications) • Matrix of seismic sensor tip sunk in the soil • AUV deployed data recorder modules (one recorder module on each tip for each campaign) MARNAUT meeting 22/01/2007

  4. Seismic monitoring • Concepts : • Sensors permanent on site • Recording autonomous node installed and removed by an AUV for each operation • Benefits • Repetitive position of sensors • Low cost of repetitive operations • Recorded S-Waves MARNAUT meeting 22/01/2007

  5. Other concept for oil field exploration Matrix of autonomous nodes with self buried sensor head only deployed for an exploration campaign MARNAUT meeting 22/01/2007

  6. Concerns of MARNAUT tests • What are the benefits of deep sunk tip regards to the coupling quality ? • Better signal to noise ratio ? • Improve S Waves detection ? • How deep to sink the tip? Compare 1 pole/tip node results 1 sub bottom bulb node provider CGG 1 self buried sensor head node 3 standard OBS(bottom lay down 3 comp. geophone) providerIfremer MARNAUT meeting 22/01/2007

  7. Sub bottom Bulb Node Operational application Self Positioning Autonomous Node SPAN Bulb head: self buried by water jetting Functional mock up of SPAN OBS part to test during MARNAUT Electronics Housing Bulb head MARNAUT meeting 22/01/2007

  8. Self buried sensor head node SERCEL ARMSS Self buried by vibrating MARNAUT meeting 22/01/2007

  9. Standard IFREMER OBS MARNAUT meeting 22/01/2007

  10. WORK SCHEDULE • MARNAUT first leg  OBS installation • Rod/tip node  cable deployment from Atalante • Bulb node & ARMSS  Nautile deployed • Standard OBS  from the ship • During the time of the campaign • Some hours of air gun shots, during the 1st half of campaign to provide some well identified seismic events (Need MTA to help us and provide air gun &ship facilities) • Local seismic events recording MARNAUT meeting 22/01/2007

  11. WORK SCHEDULE • MARNAUT last leg  OBS recovery • Standard OBS  self weight release • Bulb node & ARMSS  recovery by Nautile • Rod/tip node  recovery of recorder unit by Nautile Buoyancy lift module from Atalante, fit to the rode to extract and lift it • After MARNAUT: data processing • IFR OBS  by IFREMER Comparison • CGG OBS  by CGG of the results MARNAUT meeting 22/01/2007

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