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In their first 4D projects, experienced seismic processors often face the challenge of overcoming years of indoctrination about imaging. They need to learn that the goals and objectives for 4D processing are not necessarily the same as those for seismic imaging. It is probably hyperbole to say that we do not care about the image because without good imaging, the 4D response is not properly focused. However, the normal criteria that we use for quality control and evaluation of 3D processing do not always help us in 4D. For time-lapse processing, we want to

  • maximize repeatability between two or more seismic vintages

  • preserve and resolve differences in the reservoir that are associated with production

  • preserve true relative amplitudes and arrival times

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