Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2005-04-01
2009-11-03
Raymond, Edward (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C324S301000
Reexamination Certificate
active
07613570
ABSTRACT:
A method of deriving a calibration filter for electromagnetic data is provided. The method comprises providing a source (21, 22) of electromagnetic radiation and subsequently measuring components of the source electromagnetic field (23, 24, 25) at a receiver when the source is sufficiently close to the receiver that the down-going signal dominates over the up-going signal reflected from features below the receiver. Such a measurement can be used in frequency domain analysis (26, 28, 29) to extract the down-going signal component and derive a calibration filter for the receiver. The method is repeated (27, 30) for each receiver used in an electromagnetic sounding survey.
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Ursin B., “Review of elastic and electromagnetic wave propagation in horizontally layered media,” Geophysics, Society of Exploration Geophysicists, Tulsa, US, 48(8):1063-1081 (1983).
Amundsen Lasse
Røsten Tage
Patterson Thuente Skaar & Christensen P.A.
Raymond Edward
Statoil ASA
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