Multiple attenuation method
First Claim
Patent Images
1. Method for attenuating multiples in marine seismic data, said method comprising the steps of:
- during a first seismic survey, obtaining a first set of signals representing seismic energy reflected and/or refracted from an earth structure using a first plurality of seismic receivers located in a body of water at a first height above a seafloor;
during a second seismic survey, obtaining a second set of signals representing seismic energy reflected and/or refracted from the earth structure using a second plurality of seismic receivers located in the body of water at a second height above the seafloor;
wherein;
a first condition of the body of water during the first seismic survey is different to a second condition of the body of water during the second seismic survey; and
the first and second height are essentially equal or where the first and second heights are different the first and second set of signals are shifted by processing the first and second set of signals to an essentially equal height;
separating the first and the second set of signals into up- and down-going wavefields;
deghosting the first and second set of signals; and
using a processor to process a combination of the first and second set of signals to remove multiples.
1 Assignment
0 Petitions
Accused Products
Abstract
A method is described for reducing multiples in marine seismic data using at least two sets of signals representing seismic energy reflected and/or refracted from an earth structure using a plurality of seismic receivers located in a body of water with the two sets differing in the traveltime of signals through the body of water, separating said signals into up- and down-going wavefields and combining the two sets to remove multiples.
49 Citations
18 Claims
-
1. Method for attenuating multiples in marine seismic data, said method comprising the steps of:
-
during a first seismic survey, obtaining a first set of signals representing seismic energy reflected and/or refracted from an earth structure using a first plurality of seismic receivers located in a body of water at a first height above a seafloor; during a second seismic survey, obtaining a second set of signals representing seismic energy reflected and/or refracted from the earth structure using a second plurality of seismic receivers located in the body of water at a second height above the seafloor;
wherein;a first condition of the body of water during the first seismic survey is different to a second condition of the body of water during the second seismic survey; and the first and second height are essentially equal or where the first and second heights are different the first and second set of signals are shifted by processing the first and second set of signals to an essentially equal height; separating the first and the second set of signals into up- and down-going wavefields; deghosting the first and second set of signals; and using a processor to process a combination of the first and second set of signals to remove multiples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification