SUBTECH OBS TESTS

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

description

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: - PowerPoint PPT Presentation

Transcript of SUBTECH OBS TESTS

Page 1: SUBTECH OBS TESTS

MARNAUT meeting 22/01/2007

SUBTECH OBS TESTS

Claude LEVEQUE

IFREMER

Underwater System Department

Toulon

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MARNAUT meeting 22/01/2007

Objectives of SUBTECH OBS ProjectPartners : CGG with IFREMER and Cybernetix

• Aims to develop oil reservoir monitoringby 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

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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)

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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

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Other concept for oil field exploration

Matrix of autonomous nodes with self buried sensor head only deployed for an exploration campaign

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• 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) provider

Ifremer

Concerns of MARNAUT tests

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Sub bottom Bulb Node

Electronics

Housing

Bulb head

Operational application

Self Positioning Autonomous Node SPAN

Functional mock up of SPAN OBS part to test

during MARNAUT

Bulb head: self buried by water jetting

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Self buried sensor head node SERCEL ARMSS

Self buried by vibrating

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Standard IFREMER OBS

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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

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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