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All seismic imaging begins with the release of acoustic energy into the water, continues with the propagation of this energy through the subsurface and finishes with the harvesting of encoded messages from the reservoir. To get the required response from the reservoir you have to start with the right sound, at the right level and from the right angle.
The image of the subsurface and the attributes of the reservoir have to be de-correlated from any imprint of the acquisition system. CGG has done extensive work to eliminate the echo of the water surface from the image and attributes. Our advanced deghosting technologies from acquisition to processing demonstrate the expected efficiency and accuracy on both the source and receiver sides of the Marine Acquisition System.
However, our ambition is to improve the image resolution. The reality of acquisition reveals the marine source to be continuously moving. From a distance it appears as a single dot, quiet and static, but from close-up and shallow any element of the 250m2 source array structure can be distinguished. Removing the illumination imprint of this structure requires an accurate estimation of the seismic signature of each element at its real location.
Full Source Characterization technology enables the estimation of the source signature produced by each single element for any direction (azimuth) at any distance (offset) and for each single shot. A full acquisition system scrutinizes the sound propagation of each source element at near field, mid-field and far-field and dedicated real-time software performs joint inversion of those measurements. The complexity of the generated wavefield is revealed: the activated bubbles, their interactions, and their reflection from the sea surface. The contribution of each element at any location and any depth can be identified. Now the removal of the imprint of the marine source system from the images and attributes of the subsurface regardless of depth becomes possible:
Going deeper into resolution is not based only on better engineering of Marine Sources. Understanding the expectations of our clients helps us to define the right strategy.
Knowing the talent and high standards of our processing experts and technology, allows us to design the right sensing of our sources to feed the right measurements to the inversion algorithms and so open the door to leading edge resolution solutions.
By distributing sources with depth, we remove the imprint of sea surface interference (ghosts) with BroadSource. By measuring each single element of the source, we remove the imprint of the size of the source array (Full Source Characterization)
Increasing the density of the sources in space and time allows us to prepare the ground for more efficiency and accuracy through Simultaneous Source technology . Continuous recording is a reality today and enables us to be prepared for the continuous generation of acoustic sound through Marine Vibrators tomorrow.
CGG Marine technology has a clear vision of the road ahead and providing solutions to client challenges is our motivation!
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