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Determining structural tomographic properties of a geologic formation

  • US 10,444,065 B2
  • Filed: 02/27/2019
  • Issued: 10/15/2019
  • Est. Priority Date: 12/06/2017
  • Status: Active Grant
First Claim
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1. A method comprising:

  • directing a modulating frequency light beam with a variable frequency light source along a fiber optic cable placed within a borehole;

    inducing a deformation in the fiber optic cable with a subsurface detection device that is responsive to a specified stimulus;

    detecting a backscatter of multiple frequencies within the fiber optic cable with a plurality of optical detectors attached to the fiber optic cable, each of the optical detectors configured to detect a specified frequency of light; and

    determining physical property of a geologic formation in which the borehole is formed in response to detecting the backscatter of multiple frequencies;

    wherein inducing a deformation in the fiber optic cable comprises;

    expanding a hydrophilic gel in response to a moisture content within the borehole; and

    inducing the deformation within the fiber optic cable with the expanded hydrophilic gel.

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