Abstract: A seismic layout technique and a processing technique for providing better data acquisition relative to salt domes which utilizes a line of sources in a selected pattern opposite a salt flank from a well bore, and a plurality of spaced receivers are disposed along the well bore for coaction with energy from said plural source location to record an array of multi-fold data. The data is then processed to establish a pseudo-source point along the well bore in relation to each of the receiver points to enable subsequent CDP processing of the data thereby to establish a vertical common reflection point outline of the vertical flank of the salt dome.

Abstract: A process for separating upgoing and downgoing seismic wave events in a vertical seismic profile, and particularly for vertical seismic profiles wherein the seismic energy source is offset from the borehole in which seismic detectors are located in vertical spaced array. The process operates on two detector signals at a time (as S.sub.1 and S.sub.2) and is based on the concept that waves traveling in opposite directions have spatial derivatives of opposite sign. The derivative is approximated by the difference of the two signals which is time integrated to recover the phase. The resulting integrated difference signal I is then amplitude scale corrected and combined by addition or substraction with a signal S.sub.0 representing the sum of the two detector signals to form a succession of filtered signals which, when recorded in alignment in order of detector depths to form a vertical seismic profile preserves either the upgoing or the downgoing seismic events.