Fully calibrated sources, receivers, and positioning, combined with streamer steering, allow Q-Marine surveys to be significantly more repeatable than conventional acquisition surveys. Navigation data from Q surveys can be programmed to dictate shot and streamer positioning on subsequent Q surveys.
Steerable streamers contain the unique Q-Fin steering devices. These are remote controlled wings, integral to the streamer for reduced noise, that enable precise depth control and horizontal steering. Horizontal streamer steering has feather correction, safe streamer separation control, active steering for optimal coverage, and 4D repeatability.
The Norne field survey was completed in summer 2003. Over 90% of the survey was shot with a feather match within one degree of the 2001 survey. Q repeatability and rapid Q processing led to interpreted time-lapse effects that prompted a revision of the field drilling program within a month of acquisition. The revision lead to a successful well, the avoidance of a serious water breakthrough issue and multi-million dollar savings - the cost of drilling another sidetrack.
There are three key challenges for any reservoir-oriented seismic:Resolution, Reliability, and Repeatability.