Specifications

The Patent Office Journal 17/12/2010
4638
(12) PATENT APPLICATION PUBLICATION (21) Application No.3851/KOLNP/2010 A
(19) INDIA
(22) Date of filing of Application :13/10/2010 (43) Publication Date : 17/12/2010
(54) Title of the invention : METHOD FOR ATTENUATING LOW FREQUENCY NOISE IN A DUAL-SENSOR SEISMIC
STREAMER
(51) International classification :G01V 1/38
(31) Priority Document No :12/151,488
(32) Priority Date :07/05/2008
(33) Name of priority country :U.S.A.
(86) International Application No
Filing Date
:PCT/GB2009/001131
:06/05/2009
(87) International Publication No :WO 2009/136156
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
(62) Divisional to Application Number
Filing Date
:NA
:NA
(71)Name of Applicant :
1)PGS GEOPHYSICAL AS
Address of Applicant :STRANDVEIEN 4, N-1366 LYSAKER
NORWAY
(72)Name of Inventor :
1)TURNBULL, NEIL
(57) Abstract :
A calculated vertical velocity sensor signal is determined from a recorded pressure sensor signal (11). A constructed vertical velocity
sensor signal is determined as a linear combination of the calculated vertical velocity sensor signal and a recorded vertical velocity
sensor signal in dual-sensor seismic streamer data, using a mixture coefficient as a proportionality constant (12). An upgoing pressure
wavefield component is determined as one half of a difference of the recorded pressure sensor signal and the constructed vertical
velocity sensor signal, as a function of the mixture coefficient (13). An error in the upgoing pressure wavefield component is
determined by propagating errors in the recorded pressure sensor signal and constructed vertical velocity sensor signal terms (14). A
value of the mixture coefficient is determined that minimizes the error in the upgoing pressure wavefield component (15).
No. of Pages : 33 No. of Claims : 18