Method of borehole seismic surveying using an optical fiber
First Claim
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1. A method of detecting seismic waves traveling through a subsurface formation comprising:
- lowering a cable into a borehole in the subsurface formation, the cable having at least one optical fiber associated therewith;
causing descent of a remote end of the cable to be arrested;
feeding a further length of the cable into the borehole such that the cable is slack and in contact with at least part of a wall of the borehole; and
detecting seismic waves traveling through the subsurface formation and into the cable based at least in part on a response of the optic fiber to the seismic waves.
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Abstract
A method of detecting seismic waves traveling through a subsurface formation includes lowering a cable into a borehole in the subsurface formation, the cable having at least one optical fiber associated therewith, and causing descent of a remote end of the cable to be arrested. The method further includes feeding a further length of the cable into the borehole such that the cable is slack and in contact with at least part of a wall of the borehole, and using an interrogator coupled to the at least one optical fiber to detect seismic waves traveling through the subsurface formation and into the cable.
41 Citations
29 Claims
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1. A method of detecting seismic waves traveling through a subsurface formation comprising:
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lowering a cable into a borehole in the subsurface formation, the cable having at least one optical fiber associated therewith; causing descent of a remote end of the cable to be arrested; feeding a further length of the cable into the borehole such that the cable is slack and in contact with at least part of a wall of the borehole; and detecting seismic waves traveling through the subsurface formation and into the cable based at least in part on a response of the optic fiber to the seismic waves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 28, 29)
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22. A method of detecting seismic waves traveling through a subsurface formation comprising:
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lowering a cable into a borehole in the subsurface formation, the cable having at least one optical fiber associated therewith; deploying a seismic sensing tool associated with the cable; causing descent of a remote end of the cable to be arrested; feeding a further length of the cable into the borehole such that the cable is slack and in contact with at least part of a wall of the borehole; detecting, at least partially by the optical fiber, seismic waves traveling through the subsurface formation and into the seismic sensing tool; using an interrogator coupled to the at least one optical fiber to detect seismic waves traveling through the subsurface formation and into the cable; and determining at least one formation property from the detected seismic waves, using a computer coupled to the seismic sensing tool and to the interrogator. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification