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- by increasing vessel speed without increasing shot interval or reducing record length.
- by increasing the crossline resolution of a sparse wide spread with the use of multiple sources.
- by reducing shot interval and increasing trace density.
- by increasing record length.
Multi-vessel acquisition enables designs that significantly improve the offset-azimuth distribution of seismic data, but sequential shooting may reduce the trace density.
Synchronized source technology restores the shot density to achieve the necessary trace density for higher resolution and better S/N while preserving the improved illumination of multi-vessel design. This enables efficient full azimuth towed streamer acquisition with illumination and resolution comparable to nodes but at less cost.
All proposed designs using blended acquisition technology are validated by our subsurface imaging experts on a case by case basis. Controlled synchronization of source firing is used to record overlapping shots with shorter time intervals than record lengths. It requires a carefully configured shooting strategy so that the arrival times of reflection data from two or more different sources is tuned to optimize the separation process (de-blending). The CGG fleet is fully equipped to perform this:
CGG has a large toolbox of de-blending techniques with wide experience of their use in different locations around the world. Some of these techniques have been commercially in use on blended seabed seismic data with great success for some time. The preferred de-blending technique depends on the data, quality, the complexity of the targets and the simultaneous source scenario implemented in acquisition. By consulting Subsurface Imaging prior to designing the survey, the distribution of the sources and their firing sequences are carefully chosen and the chances of successful de-blending are maximized.
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