ON WELL VELOCITY DATA AND THEIR APPLICATION TO REFLECTION SHOOTING

Current methods of computing seismic reflection data employing the integration of the actual velocity‐depth (or velocity‐time) relation in the velocity column are confronted with difficulties and limitations because they neglect the stratigraphic effect on the velocity distribution. A method is proposed where the measured incremental time‐depth relation, ΔZ/ΔT, to each of a number of stratigraphic markers may be combined into one generalized depth or time function satisfying well velocity data from a number of wells. The proposed method employs the integration of this slope relation and is used in conjunction with regional correction contour maps. Because this relation results from the combined load and stratigraphic effects together with the geological behavior of the section, this method offers distinct advantages both in accuracy and applicability. Advantages and limitations in the application of this method are discussed.