Method and apparatus for controlling output of an array of seismic sources
AssigneeCgg Services SAS
InventorsCecile Berron, Julien Meunier
Life of this patent
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Abstract
Apparatus, computer instructions and method for controlling an energy output of a source array to be used in a seismic survey for illuminating a subsurface. The method includes generating a model (β) based on up-going (U) and down-going (D) components of seismic waves generated by source elements that form the source array; calculating the amplitudes and phases of each source element based on the model (β); and driving the source array based on the calculated amplitudes and phases for the source elements so that a ghost generated by the source array is reduced at emission.
Claims19
A method for controlling an energy output of a source array to be used in a seismic survey for illuminating a subsurface, the method comprising:
- generating a model (β) based on up-going (U) and down-going (D) components of seismic waves generated by source elements that form the source array;
- calculating the amplitudes and phases of each source element based on the model (β);
- and
- driving the source array based on the calculated amplitudes and phases for the source elements so that a ghost generated by the source array is reduced at emission,
- wherein the model (β) for two source elements S1 and S2 is given by
- (
- 1
- 1
- -
- z
- 2
- -
- z
- 1
- -
- z
- 2
- z
- 2
- z
- 2
- -
- 1
- -
- z
- z
- 2
- -
- 1
- )
- ·
- (
- S
- 1
- S
- 2
- )
- ,
- where z is a phase shift.
A method for controlling an energy output of a source array to be used in a seismic survey for illuminating a subsurface, the method comprising:
- distributing source elements that form the source array in a well, at different depths;
- generating a model (β) based on up-going (U) and down-going (D) components of seismic waves generated by source elements that form the source array;
- calculating the amplitude and phase of each source element based on the model (β);
- and
- driving the source array based on the calculated amplitudes and phases for the source elements so that a ghost generated by the source array is removed.
A method for controlling an energy output of a source array to be used in a seismic survey for illuminating a subsurface, the method comprising:
- generating a model (δ) based on up-going (U) and down-going (D) components of seismic waves generated by source elements that form the source array;
- calculating the phase of each source element based on the model (δ);
- and
- driving the source array based on the calculated phases for the source elements so that a ghost generated by the source array is reduced at emission,
- wherein the model (δ) for two source elements S1 and S2 is given by
- 1
- 2
-
- (
- 1
- 1
- z
- 1
- z
- )
- ·
- (
- S
- 1
- S
- 2
- )
- ,
- z being a phase shift.
A seismic survey system that emits deghosted seismic waves, the system comprising:
- plural source elements forming a source array, wherein the plural source elements are buried in a well;
- plural seismic receivers configured to record seismic waves originating from the plural source elements;
- and
- a controller connected to the plural source elements and configured to apply driving signals to the plural source elements to emit the deghosted seismic waves,
- wherein a model (β) based on up-going (U) and down-going (D) components of seismic waves generated by source elements that form the source array are used to generate the driving signals.
Dependencies are inferred from the claim text.