Randomization of data acquisition in marine seismic and electromagnetic acquisition
First Claim
1. A method for a marine seismic acquisition, comprising:
- towing a marine seismic spread in a generally curved advancing path over a survey area to form a plurality of generally circular sail paths, wherein the marine seismic spread includes at least one source and a plurality of marine seismic streamers;
permitting the plurality of marine seismic streamers to drift while controlling the crossline streamer separation;
shooting the at least one source while towing the marine seismic spread in the generally curved advancing path; and
recording a plurality of reflections from the survey area.
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Accused Products
Abstract
The presently disclosed technique includes a method for use in a marine survey comprising randomizing the distribution of receivers and sources during a coil shoot acquisition. The randomizing can be implemented in a number of ways. For example, in one embodiment, randomizing the distribution includes randomizing the positions of the circle centers defining the sail lines. This may be implemented by, for example, distributing the same number of circle centers as would be used in a non-random sampling in a uniform random distribution. In another embodiment, randomizing the distribution includes permitting the streamers in which the receivers are allowed to drift while controlling crossline streamer separation. Other embodiments may combine these approaches or utilize still other approaches.
135 Citations
17 Claims
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1. A method for a marine seismic acquisition, comprising:
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towing a marine seismic spread in a generally curved advancing path over a survey area to form a plurality of generally circular sail paths, wherein the marine seismic spread includes at least one source and a plurality of marine seismic streamers; permitting the plurality of marine seismic streamers to drift while controlling the crossline streamer separation; shooting the at least one source while towing the marine seismic spread in the generally curved advancing path; and recording a plurality of reflections from the survey area. - View Dependent Claims (2, 3)
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4. A method for a marine seismic acquisition, comprising:
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towing a marine seismic spread in a generally curved advancing path over a survey area to form a plurality of generally circular sail paths, wherein the marine seismic spread includes at least one source and a plurality of marine seismic streamers having a plurality of marine seismic receivers; positioning the at least one source in a random manner; shooting the at least one source while towing the marine seismic spread in the generally curved advancing path; and recording a plurality of reflections from the survey area. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method, comprising:
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identifying a desired region; determining a plurality of generally curved advancing sail paths of a marine seismic spread over the desired region, wherein the marine seismic spread comprises at least one source and a plurality of marine seismic streamers and respective generally curved advancing sail paths in the plurality of generally curved advancing sail paths have a radius that is a function of a width of the marine seismic spread; and distributing the generally curved advancing sail paths over the desired region in a random manner. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for a marine seismic acquisition, comprising:
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towing a marine seismic spread in a generally curved advancing path over a survey area to form a plurality of generally circular sail paths, wherein the marine seismic spread includes at least one source and a plurality of marine seismic streamers having a plurality of marine seismic receivers and wherein respective generally curved advancing sail paths in the plurality of generally curved advancing sail paths have a radius that is a function of a desired coverage fold for the survey area; positioning the at least one source, the plurality of marine seismic receivers or both in a random manner; shooting the at least one source while towing the marine seismic spread in the generally curved advancing path; and recording a plurality of reflections from the survey area.
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Specification