Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2000029874 - CABLE SISMIQUE AVEC CAPTEURS PLUS LOURDS QUE LEDIT CABLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

C l a i m s

1. Seismic cable for positioning at the sea floor
comprising at least two seismic sensor units (4) adapted to detect vibrations in the sea bottom and being separated by chosen lengths of cable (1),
c h a r a c t e r i z e d in that each of the sensor units

(4) is substantially heavier than the cable between them, that the seismic sensor units (4) comprises at least one sensors, said sensors including at least one geophone (5) integrated in the cable, that each sensor unit also
comprises means for digitizing the signals from each sensor

(5,6), and that the cable comprises at least one conductor for transferring the digitized signals from the sensors.

2. Seismic cable according to claim 1,
c h a r a c t e r i z e d in that the ratio between the cable weight and the sensor weight per length unit is maximum 1/10, e.g. in the range of 1/30.

3. Seismic cable according to claims 1 or 2,
c h a r a c t e r i z e d in that the weight per length of the sensor units (4) in air is approximately 25 kg/m.

4. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the weight of the sensor units (4) is adapted to provide an acoustic coupling to the sea floor in the frequency range of 3-150 Hz.

5. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the sensor units (4) comprises three geophones (5) , each with a direction of sensitivity being perpendicular to the other.

6. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the sensor units (4) comprises at least one hydrophone (6) .

7. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the circumference of the cable (1) is less than the circumference of the sensor units (4) .

8. Seismic cable according to claim 7,
c h a r a c t e r i z e d in that the ratio between the cable volume per metre and the sensor unit volume per metre is about 1/2 or less.

9. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the sensor unit (4) comprises a bend restrictor.

10. Seismic cable according to any one of the preceding claims,
c h a r a c t e r i z e d in that the cable (1) between the sensor units is adapted to attenuate acoustic vibrations propagating along the cable.