Patent EP0320073A2 successfully refreshed from Google Patents.
EP0320073A2
Expired / Lapsed
EP
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Air gun array
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1988-12-07
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Granted: —
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Expires: 2008-12-07
Abstract
Abstract A method is provided for determining marine seismic arrays that operate as broad-band high energy sources. The preferred method selects the minimum frequency corresponding to the largest air gun size and the number of air guns in an array. The remaining air guns are then used to fill in the first octave from the minimum frequency in a manner to compensate for the fact that the amplitude of an air gun is inversely proportional to its frequency.
Inventors
- 👤 Robert Ludwig Rosenbladt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:29
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/003; G01V1/006
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A method for determining the source frequencies of an array of seismic sources characterized by the steps of: - providing the lowest frequency of a desired array frequency spectrum, - providing the total number of sources to be employed in the array, and - determining a distribution of source frequencies for the remaining sources in a preselected frequency range so that the frequency spacing in said distribution is adjusted to compensate for the amplitude variation of each source with frequency.
Claim 2
Independent Claim
80 words
A method for determining the source frequencies of an array of seismic sources characterized by the steps of: - providing the lowest frequency of a desired array frequency spectrum, - providing the total number of sources to be employed in the array, and - determining a distribution of source frequencies for the remaining sources in a preselected frequency range so that the frequency spacing in said distribution is adjusted to compensate for the amplitude variation of each source with frequency.
Claim 3
Dependent Claim
29 words
The method as claimed in claim 1, characterized by the step of determining the operating parameters of said sources to provide said distribution of frequencies and said lowest frequency.
Claim 4
Dependent Claim
15 words
The method as claimed in claim 2, characterized in that said sources are air guns.
Claim 5
Dependent Claim
23 words
The method as claimed in claim 3, characterized in that said preselected frequency range is one octave that starts at said lowest frequency.
Claim 6
Dependent Claim
15 words
The method as claimed in claim 2, characterized in that said sources are water guns.
Claim 7
Dependent Claim
19 words
The method as claimed in claim 2, characterized in that said operating parameters are selected to be gun volumes.
Claim 8
Dependent Claim
47 words
A marine seismic array having a preselected number of sources and having a preselected low frequency, characterizing by marine seismic sources having frequencies determined to provide a frequency spacing that compensates for amplitude variation with frequency for each of said sources over a preselected range of frequencies.
Claim 9
Dependent Claim
47 words
A marine seismic array having a preselected number of sources and having a preselected low frequency, characterizing by marine seismic sources having frequencies determined to provide a frequency spacing that compensates for amplitude variation with frequency for each of said sources over a preselected range of frequencies.
Claim 10
Dependent Claim
27 words
The array as claimed in claim 7, characterized in that said preselected range of frequencies is a range between said low frequency and twice said low frequency.
Claim 11
Dependent Claim
17 words
The array as claimed in claim 8, characterized in that said preselected number of sources is eight.
Claim 12
Dependent Claim
15 words
The array as claimed in claim 9, characterized in that said sources are air guns.
Claim 13
Dependent Claim
20 words
The array as claimed in claim 10, characterized in that said low frequency is in the range of 5-15 Hz.
References Cited (Backward Citations)
No citation records indexed.
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