In the June 1967 issue of the Bulletin of The American Association of Petroleum Geologists, L. E. Nugent criticized the modern stacking procedures. He stated that more harm than good comes from stacking unless the line is parallel with the strike of the reflecting beds. Nugent’s examples are based on a dip of 10° and he showed serious cancellation of data resulting from the fact that the theoretical “common depth point” has been stretched out to a line of subsurface. My calculations of this “stretch” are much less than Nugent’s. The fact also must be considered that, generally, planes of...

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