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Recall from Chapter 1 that our ability to obtain an interpretable 4D seismic data set is a function of both detectability and repeatability. Chapters 3 and 4 have concentrated on detectability. Now we focus on repeatability - a quantity that has been alluded to but not yet fully defined. Repeatability is simply a measure of the similarity of two or more vintages of seismic data, and a primary goal of 4D seismic acquisition and processing is to maximize repeatability. That can come at a cost. As a result, the effort put into acquisition (and to a lesser extent, into processing, which is discussed in Chapter 6) must be balanced by the expected level of 4D detectability and by factors such as water depth, reservoir depth, sea-bottom conditions, and operational constraints.

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