Contact: Philippe Plantevin Email : pplantevin@soacsy - Website : soacsy
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SAN DIEGO16/11/2010
Contact: Philippe PlantevinEmail : pplantevin@soacsy.com - Website : www.soacsy.com
Tél. +33 (0)4 90 49 06 91- Mob. +33 (0)6 60 24 16 25
A NEW ACOUSTIC SOLUTION FOR SEABED CHARACTERIZATION
SAN DIEGO16/11/2010
OUR SOLUTION
OUR SOLUTION: SOAC-LOGS
Acquisition Post-Processing Characterization
SOAC-CHIRP
Sub-bottom profilerAcquisition softwareProcessing software
SOAC-LOGS
Software module: Estimation of absorption, reflectivity, impedance
SOAC-LOGS
CalibrationsGeotechnical andGranulometric estimations
Direct measurements (piezocone, coring)
- Gives access to Geoacoustical, Geotechnical or Granulometric parameters - Down to 50 ft. in sands while maintaining very high resolution (< 4 in.) - Even in inaccessible or complex zones (near oil platforms)
SEABED CHARACTERIZATION TODAY - Geophysical (SBP) and Geotechnical (Piezocone, coring) tools used for seabed assessment - Results often difficult to correlate- Current available acoustic solutions limited to qualitative visualization
AN INTEGRATED SOLUTION: FROM ACQUISITION TO CHARACTERIZATION
SAN DIEGO16/11/2010
APPLICATIONS
- Access to a full seabed 3D view between CPT points for pipeline routing
=> avoid mismatch with a predefined installation path
- Marine aggegates: Optimizes exploitation without coring
- Coastal hazards: Evaluate slope stability
- Offshore Eng. : Determine Best anchor points to focus coring
- Detect buried structures even near oil platforms=> to draft precise implementation plans as well as optimizing and facilitating on site work
BENEFITS:
• Better understanding of geological processes• Reduced operating costs – Time effective• Better assessment of geotechnical hazards
SAN DIEGO16/11/2010
SOAC-CHIRP Sediment ProfilerIntegration exam
ple: Nym
phea / Geocean
Developed to optimize SOAC-LOGS characterization performance:
• Chirp signals from 400 Hz up to 8 kHz
=> High penetration (50 ft. in sands) with high resolution (< 4 in.)• High stability of the source
=> Advanced signal processing, • Innovative antenna
=> High rejection of lateral echoes (±7°)
Easy mounting on small pneumatic boats and survey vessels between 6 m (20 ft) and 15 m (50 ft).
Easy handling: 4 modules less than 36 kg (80 lbs)
SOAC-CHIRP can be operated even in inaccessible or complex zones
SAN DIEGO16/11/2010
SOAC-LOGS Module for characterization
Soac-logs
Sub-bottom profiler Full signals in seg-y format (module and phase)
Sounder Parameters
(Source Level,…)
1) Absorption (dB/) 2) Reflectivity (dB) 3) Impedance (kg.m-2s-1)0) Raw seismogram
CalibrationGeotechnical orGranulometric
parametersDirect
measurementsCp,
*Data provided courtesy of IFREMER : exeample of result with CHIRP GF
SAN DIEGO16/11/2010
SHALLOW WATER EXAMPLE
A project carried out by Soacsy next Nice AirportSeismogram SOAC-CHIRP
Acoustic impedance SOAC-LOGS
Gas front
Layers of sediments
Fine-grained sediments
Acquisition: SOAC-CHIRP
SAN DIEGO16/11/2010
Data acquired by Ifremer (Suroit Vessel) - Storegga (Norway)
DEEP WATER EXAMPLE
Raw seismogram
Corrected seismogram
Improved vertical resolution
Estimated impedance:The strong reflector of a fine layer with a very lowimpedance
SAN DIEGO16/11/2010
CONCLUSION
>Validated on various dataset by comparison with direct measurements:
-Using a piezocone (Guinea Gulf – Ifremer/Total)
-Using physical measurements carried out after coring (Marmara sea – Collège de France/Ifremer).
>Technology currently sold as a service operated by Soacsy
>Product available soon for sale and hire
>SOACSY is looking for technical and financial partnerships in order to sell its solution on the US market.
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