Method and device for acquisition of seismic data
First Claim
1. Method of acquiring seismic data in a prospecting area comprising, in order to establish a trace, the steps of:
- (a) disposing on or over the terrestrial surface in said prospecting area an array of vibration receivers, said array including at least one row of regularly spaced receivers,(b) disposing in the vicinity of said array a plurality of vibration sources each adapted to emit vibrations with a frequency spectrum in a specific frequency band, the frequency bands of the spectra of said sources being adjacent and together covering the frequency band of seismic data signals, a high-frequency first source being placed at the center of said array and a low-frequency second source being placed near an end of said array, said first source emitting vibrations at a higher frequency than said second source, said first and second sources having adjacent vibration frequency spectra and being separated by a distance substantially equal to one half the length of said array,(c) emitting vibrations with different frequency spectra from said first and second sources,(d) recording said vibrations after reflection from strata beneath the terrestrial surface by means of said receivers,(e) moving said sources relative to said array in an acquisition direction by a trace displacement increment, and(f) repeated the above steps (c), (d) and (e) for a plurality of successive movements by said trace displacement increment.
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Abstract
In a method of acquiring seismic data in a prospecting area, an array of excitation vibration receivers is placed on or over the terrestrial surface. A plurality of excitation vibration sources is disposed in the vicinity of the array, each source emitting excitation vibrations with a frequency spectrum in a specific frequency band. These bands are adjacent and together cover the frequency band of usable seismic data signals. When the excitation vibrations are emitted by the plurality of sources, the excitation vibration echoes reflected from strata beneath the terrestrial surface are registered by the receivers. The above steps are repeated for a plurality of successive trace increment displacements to produce an emission figure and to cover the prospecting area. The method and the device implementing it can be used for acquisition of terrestrial or marine seismic data.
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Citations
20 Claims
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1. Method of acquiring seismic data in a prospecting area comprising, in order to establish a trace, the steps of:
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(a) disposing on or over the terrestrial surface in said prospecting area an array of vibration receivers, said array including at least one row of regularly spaced receivers, (b) disposing in the vicinity of said array a plurality of vibration sources each adapted to emit vibrations with a frequency spectrum in a specific frequency band, the frequency bands of the spectra of said sources being adjacent and together covering the frequency band of seismic data signals, a high-frequency first source being placed at the center of said array and a low-frequency second source being placed near an end of said array, said first source emitting vibrations at a higher frequency than said second source, said first and second sources having adjacent vibration frequency spectra and being separated by a distance substantially equal to one half the length of said array, (c) emitting vibrations with different frequency spectra from said first and second sources, (d) recording said vibrations after reflection from strata beneath the terrestrial surface by means of said receivers, (e) moving said sources relative to said array in an acquisition direction by a trace displacement increment, and (f) repeated the above steps (c), (d) and (e) for a plurality of successive movements by said trace displacement increment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Device for acquisition of seismic data in a prospecting area comprising on or over the terrestrial surface in said prospecting area:
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an array of vibration receivers; and a plurality of vibration sources each adapted to emit vibrations with a frequency spectrum in a specific frequency band, the frequency bands of the spectra of said sources being adjacent and together covering the frequency band of seismic data signals, said plurality of sources comprising a first source placed at the center of said array and a second source placed near an end of said array, said first source emitting vibrations at a higher frequency than said second source emissions, said first and second sources having adjacent vibration frequency spectra and being separated by a distance substantially equal to one half the length of said array. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification