3D SEISMIC ACQUISITION
First Claim
Patent Images
1. ) A method of imaging a marine 3D survey area, comprising:
- a) obtaining or developing a geology model of a marine survey area;
b) determining a bin size and orientation based on a smallest feature to be mapped and a shape of said marine geology model;
c) determining a stability of a compressed seismic imaging source and receiver station and sampling design (“
CSI design”
), and if unstable modify said bin size or orientation and re-determine said stability iteratively to produce a stable CSI design;
d) establishing a set of sampling rules or criteria for coverage of said marine survey area to assure that appropriate data is recorded so said stable CSI design can be properly reconstructed;
e) acquiring 3D seismic data traces over said marine survey area using said stable CSI design until said rules or criteria are met, wherein wind and current are not compensated for but allowed to direct vessel travel;
f) reconstructing a wavefield and regularizing the traces using the appropriate reconstruction techniques to produce seismic data; and
g) processing the seismic data and imaging the survey area.
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Abstract
Disclosed are methods of marine 3D seismic data acquisition that do not require compensation for winds and currents.
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Citations
14 Claims
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1. ) A method of imaging a marine 3D survey area, comprising:
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a) obtaining or developing a geology model of a marine survey area; b) determining a bin size and orientation based on a smallest feature to be mapped and a shape of said marine geology model; c) determining a stability of a compressed seismic imaging source and receiver station and sampling design (“
CSI design”
), and if unstable modify said bin size or orientation and re-determine said stability iteratively to produce a stable CSI design;d) establishing a set of sampling rules or criteria for coverage of said marine survey area to assure that appropriate data is recorded so said stable CSI design can be properly reconstructed; e) acquiring 3D seismic data traces over said marine survey area using said stable CSI design until said rules or criteria are met, wherein wind and current are not compensated for but allowed to direct vessel travel; f) reconstructing a wavefield and regularizing the traces using the appropriate reconstruction techniques to produce seismic data; and g) processing the seismic data and imaging the survey area. - View Dependent Claims (5, 11, 12, 13, 14)
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2. ) A method of acquiring marine 3D seismic data comprising:
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a) acquiring 3D seismic data of an marine area to be surveyed without compensating for wind and current, but instead allowing wind and current to direct >
25% of said travel;b) collecting data positioning data while acquiring 3D data; and c) continuing said acquiring step a) until said collected positioning data indicates that sufficient coverage of said marine area has been obtained such that a seismic map of said marine area can be constructed from said 3D seismic data. - View Dependent Claims (3, 4, 6, 7, 8, 9, 10)
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Specification