Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2011-07-19
2011-07-19
Nguyen, Ha Tran T (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C324S323000, C324S337000, C324S357000
Reexamination Certificate
active
07982465
ABSTRACT:
A method for analyzing acquired electromagnetic measurements (R) made at or in a sea (4) over a seafloor (1) with rock formations (3) having relatively low resistivity (ρ3) for detecting a possibly underlying petroleum bearing reservoir formation (2) having relatively high resistivity (ρ2), wherein a low frequency electromagnetic transmitter (5) arranged in the sea (4) emits an electromagnetic field (P) propagating in the sea (4), in the rocks (3, 2) and in the air (0) above the sea; wherein electromagnetic sensors (6) are arranged with desired offsets (x) in the sea (4) for measuring the electromagnetic field (P(x)) while the field propagates, characterized in that one or more component of the electromagnetic field (P) is measured at least one large offset (xL) from the transmitter (5) where the field (P) essentially only has its origin from the field propagating as a field (P0) through the air (0); that the one or more components of the electromagnetic field (P) measured at the large offset (xL) is calculated back to a recalculated field (F0(x)) to one or more offsets (x) being shorter than the large offset (xL); that the recalculated field (P0(X)) is subtracted from the field (P(x)) for possibly highlighting a field which arising due to the possibly petroleum bearing reservoir formation (2) having relatively high resistivity (ρ2).
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Farrelly Brian Anthony
Johnstad Svein Erling
Westerdahl Harald
Chan Emily Y
Multifield Geophysics AS
Nguyen Ha Tran T
Wenderoth , Lind & Ponack, L.L.P.
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