SynAcq

Acquiring data rapidly without compromising quality

When data needs to be acquired quickly, due to environmental or seasonal constraints, or to meet business deadlines, SynAcq synchronized acquisition may enable a 100% increase in productivity. SynAcq uses two independent vessels with active seismic interference management and mitigation, to enable deadlines and commitments to be met and give asset teams more time to evaluate the data.

SynAcq SI shots
Shots before (left) and after (right) Seismic Interference attenuation

Benefits

  • Delivers peace of mind to our customers for time critical projects 
  • Ensures that licensing round commitments can be met and drilling plans respected
  • Gives asset teams more time to evaluate the data, and so facilitates better decision making for tight deadlines by 100% increase in productivity
  • No loss of data quality
  • Two vessels reduce risk of total operation shutdown due to vessel or spread failure
  • Optimize timeshare slots with 2 CGG vessels co-existing during respective slots
  • Through cooperation and coordination of vessel movements and speeds, including between different contractors, time lost by CGG in the North Sea due to SI was reduced to less than 5% in 2015 compared to 10% in 2014

Features

  • Deploys two vessels with active seismic interference (SI) management and elimination
  • Uses same spreads and configurations as conventional single vessel acquisition to deliver data of the same quality
  • Proprietary command and control integrated into the navigation system
  • Integrated acquisition and seismic imaging for expert onboard processing and SI removal
  • Can be complemented by quality on-board processing to further reduce overall turnaround time and deliver superior fast-track data
Seismic Interference graph Minimum required vessel separation (as a function of water depth and sea-bottom reflectivity)

Controlled Seismic Interference (SI)

The deeper the water and the softer the seabed the closer two vessels can operate. If the shotpoint intervals between the two vessels differ by more than around 250ms, the vessels could get very close.

With synchronized acquisition controlled by SeaProNav 4 CGG can acquire data with only SI that CGG processing can attenuate, to provide data in roughly 50% time without compromising quality.

In deeper water SI dissipates faster. In shallow water with identical shotpoint intervals SI can be problematic even 100km away. In the North Sea, using a standard 4000cu inch source the rule of thumb separation is 25km.

Seismic Interference – planned mitigation

Tandem AcquisitionWe need to avoid SI that is both broadside and arrives at the same time from shot to shot. Depending on the survey size, among other things, this can be achieved by either:

  • Independent shooting, where two vessels shoot independently in different parts of the survey area. In this case the vessels need to be separated by a large distance so it is only suitable for relatively large surveys.

or:

  • Tandem Shooting, where one vessel shoots around 3 hours (25-30km) behind the other and at a slightly different speed, allowing the vessels to pass during line changes when only one vessel is acquiring data, so avoiding broadside SI. This method is suitable for relatively small surveys (1000-4000km2).

When both vessels are shooting, their shotpoint intervals should differ by ~250ms from shot to shot, which may require a slowdown of 5% for one vessel. Additional time-dithering of source firing could be implemented.

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