Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1989-09-20
1990-11-06
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
181113, G01V 128
Patent
active
049691295
ABSTRACT:
One or more seismic sources impart seismic pulses into the earth in a coded sequence. The coded sequence is composed of a minimum of three cycles of a Galois sequence of order N, where N is a positive integer. The response of subsurface formations to the coded sequence is obtained and correlated with one cycle or the outgoing Galois sequence of the same order. Correlation properties of the Galois sequences provide a way to sum a large number of seismograms that are superimposed in time, improving the signal to noise ratio while keeping the field time in which the seismograms are obtained to a minimum. Using this encoding technique, responses of subsurface formations to concurrent activation of each of several sources can be obtained and separated from each other.
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Gillespie Ronald G.
Kulason Robert A.
Lobo Ian J.
Park Jack H.
Texaco Inc.
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