Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1987-07-17
1989-03-14
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
364421, G01V 136
Patent
active
048130273
ABSTRACT:
A method and apparatus for stacking a plurality of seismic midpoint gathers to provide an enhanced pictorial representation of seismic events is disclosed. The approximate propagation velocity corresponding to a selected event in a common midpoint gather, is determined by summing the common midpoint gather using first and second weights to provide respective first and second weighted sums over offset based on an estimated velocity corresponding to the event, and developing from the sums a velocity error value indicative of the approximate error between the estimated velocity and the actual velocity. The common midpoint gather is then re-stacked in accordance with the determined propagation velocity to provide an enhanced pictorial representation of the seismic event. The first and second weighted sums are taken over a time window centered upon an estimated zero offset travel time for the event. The first and second weights can be selected to provide rapid, slow or intermediate convergence upon the true velocity. The velocity error value is determined as a function of the deviation of the peak of the first weighted sum from the center of the time window, relative to the deviation of the peak of the second weighted sum from the center of the time window. Alternatively, the velocty error value is determined as a function of the deviation of the peak of the crosscorrelation of the first and second weighted sums from the center of the time window.
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Arabian American Oil Company
Lobo Ian J.
Tarcza Thomas H.
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