It is critical that the seismic datasets be as similar as possible so that any observed differences may be confidently assigned to changes in the subsurface. A major cause of non-repeatability is the variability of seismic data acquisition. The Q-Marine seismic system designed specifically for marine time-lapse seismic acquisition has been enhanced with Dynamic Spread Control.
A significant advantage of using a calibrated system with highly accurate acoustic positioning coupled with steerable streamers is that a clearer 4D image for more accurate interpretation is obtained. Further, with better 4D signal-to-noise ratios, the time between baseline and monitor surveys may be reduced and reservoirs with only small 4D effects become viable prospects for the time-lapse technique.
Benefits of Q-Marine technology for time-lapse seismic acquisition
High-resolution 4D seismic data requires high levels of repeatability. The many errors and perturbations inherent in the acquisition system must be controlled as much as possible. If they are not controlled, high-frequency signals are degraded and are unrecoverable. In time-lapse (4D) seismic surveys, these errors may produce perturbations in the final difference volumes causing interpretation errors. The Q-Marine system has been designed to control these errors through:
Time-lapse survey (4D) planning and acquisition QC The WesternGeco integrated navigation system (TRINAV) provides utilities to assist the online navigator in steering the source (by way of the vessel) and streamers in such a way as to provide the best possible repeat of the baseline survey. Utilities are also available to provide quality control and analysis of each line in terms of source positioning, feather, and source/feather repeatability. Such analysis can also be made on a survey-wide basis
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