Method and device for filtering elliptical waves propagating in

Details Method and device for filtering elliptical waves propagating in Method and device for filtering elliptical waves propagating in

1996-07-24

1998-07-14

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 45, 367 47, 364421, G01V 116, G01V 136

Patent

active

057815020

ABSTRACT:
The present invention relates to a filtering method for discriminating elliptical waves among other waves propagating in a material medium (such as a geologic formation for example) by a combined processing of the components measured along several axes of the waves received by a multi-axis receiver. It comprises detection by at least one receiver (R) (consisting for example of one or several directional detectors such as geophones or accelerometers coupled with said formation) of the wave components in at least two orthogonal directions. A determination (by a processing assembly (1)) of the wavelet transforms of the signals is produced by this receiver (R) in response to the waves received and selection of the amplitudes of the signals resulting from this wavelet transformation is performed according to a criterion based on the ratio of the respective amplitudes thereof. The method can be used for the filtering of surface or tube waves within the scope of a seismic exploration.

REFERENCES:
patent: 4783770 (1988-11-01), Danbom
patent: 4951266 (1990-08-01), Hsu
patent: 5555530 (1996-09-01), Meehan
Chakrabarty et al, 64th Annu SEG Int. Mtg. Oct. 28, 1994, pp. 725-728; abst. only herewith.
Zhu et al, 1994 Int. Symp. Digest Anten. & Prop. vol. 1, IEEE, pp. 8-11; abst only herewith.
Becquey et al, 58th EAGE Conf., Jun. 7, 1996, Paper No. B006, 2 pp.; abst only herewith.
He et al, Oil Geophys. Prosp., vol. 30, #2, pp. 257-263, Apr. 15, 1995; abst. only herewith.

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