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Electromagnetic surveying for hydrocarbon reservoirs

  • US 20070150201A1
  • Filed: 10/24/2006
  • Published: 06/28/2007
  • Est. Priority Date: 12/07/2001
  • Status: Abandoned Application
First Claim
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1. An electromagnetic survey method for surveying an area previously identified as potentially containing a subsea hydrocarbon reservoir, comprising:

  • providing an electromagnetic source having a dipole axis and first and second detectors;

    moving the electromagnetic source with the dipole axis of the electromagnetic source aligned end-on relative to the first detector so that a first survey data set is sensitive to resistive hydrocarbon layers exploiting largely galvanic effects;

    moving the electromagnetic source with the dipole axis of the electromagnetic source aligned with the dipole axis of the electromagnetic source aligned broadside relative to the second detector so that a second survey data set is relatively insensitive to resistive hydrocarbon layers exploiting dominantly inductive effects;

    moving the electromagnetic source relative to each detector to collect data over a range of source-to-detector distances; and

    processing the first survey data set and the second survey data set.

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