How many times do we hear “It's a very high-fold survey” or “It's an xx-fold survey”? Most people who work in seismic data acquisition or processing are used to discussing “fold” as though this is a universal parameter that defines the quality of any given survey, with higher fold automatically implying better data quality. Is this really true?

Figure 1 shows a portion of the same line extracted from two different 3D volumes. Data quality is very different … yet all the same recorded field data is included in each data set, the velocity functions used...

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