Method of off-shore seismic prospecting

Details Method of off-shore seismic prospecting Method of off-shore seismic prospecting

1993-12-01

1995-06-13

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 15, G01V 138

Patent

active

054249996

ABSTRACT:
An off-shore seismic prospecting method for enabling at least two ships to prospect over a single site simultaneously, in which each of the ships generates disturbances in the off-shore environment and uses sensors to record seismic traces containing useful information concerning the geology of the subsoil. A ship is liable to constitute a point source of noise for another ship, which noise gives rise to an undesirable signal that masks said useful information. According to the invention said point source of noise is localized in three dimensions and the space-time coordinates thereof [(X'(t), Y'(t), Z(t)] during the recording is stored in terms of a frame of reference in which the space-time coordinates [(X.sub.r (t), Y.sub.r (t), Z.sub.r (t)] of the sensors are also recorded, after which the recorded seismic traces are processed as a function of the space-time coordinates of the point source of noise in order to eliminate said undesirable signal.

REFERENCES:
patent: 4689821 (1987-08-01), Salikuddin et al.
patent: 4852004 (1989-07-01), Manin
patent: 4910716 (1990-03-01), Kirlin et al.
patent: 4937794 (1990-06-01), Marschall et al.
patent: 5237538 (1993-08-01), Linville, Jr. et al.
Geophysics vol. 56, No. 10, Oct. 1990, Tulsa US pp. 1677-1680 D. B. Harris et al. `Seismic noise cancellation in a geothermal field` *p. 1677, right column, line 25, p. 1678, left column, line 14*.
Journal Of The Acoustical Society Of America, vol. 87, No. 3, Mar. 1990, New York US pp. 963-975 P. A. Nelson et al., `Active control of stationary random sound fields` *figure 1*.

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