Communications: electrical – Selective – Having indication or alarm
Patent
1974-08-09
1978-05-23
Moskowitz, Nelson
Communications: electrical
Selective
Having indication or alarm
340 155CP, 346 33C, G01V 128, G01V 116, G01V 124
Patent
active
040913589
ABSTRACT:
In seismic exploration of water-covered areas of the earth, a seismic cable containing seismic energy detecting means spaced along the cable is used. The detecting means are grouped into one or more arrays situated along the length of the cable, and each array is divided into a plurality of groups. The detector outputs within each group are connected in parallel within the cable. Selected group outputs, corresponding to varying segmental lengths along the cable, are summed to enhance seismic data signal-to-noise ratio. The summed signal used for seismic analysis is determined by the maximum array segmental length over which reflected seismic signal components are substantially phase correlated. This length varies with record time, with geologic dip of the earth layers, and with distance of the detectors from the seismic source. This invention permits the selection, during seismic analysis, of the array segmental length that provides the most useful seismic data. During seismic analysis, shorter segmental lengths are used during the portion of record time when high frequency reflections or nonvertical ray paths are present. Longer array segmental lengths are used during the record time when near vertical array paths exist or when only lower frequency reflections appear on the record.
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patent: 3775738 (1973-11-01), Quay et al.
patent: 3887897 (1975-06-01), Neitzer et al.
Exxon Production Research Company
Moskowitz Nelson
Thigpen E. Eugene
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