Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1997-10-27
2000-05-09
Oda, Christine K.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 77, G01V 122
Patent
active
060612991
ABSTRACT:
The invention relates to a two-phase method of transmitting, to a central station (CS), seismic signals received by seismic receivers (R) and picked up by collecting units (A) disposed in the field. In the first phase, a compression is applied to each seismic trace, the ratio of which is adapted to the duration of a transmission window placed in the time intervals between successive seismic transmission-reception cycles, as well as to the rate of the transmission route used. The compressed trace as a whole is thus transmitted, allowing an operator at central station (CS) to check qualitatively that recording took place correctly in each collecting unit (A) even though he does not have the exact trace available. In the second phase, at the end of the current seismic session for example, the seismic traces are reconstituted in the central station with the necessary accuracy, either by complete transmission of the data preferably after prior compression, or, in certain cases, by transmission of residues eliminated in the first phase for the requirements of the first transmission.
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Bui-Tran Van
Grouffal Christian
Institut Francais du Pe'trole
Oda Christine K.
Taylor Victor J.
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