Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2006-01-09
2010-10-12
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C324S357000
Reexamination Certificate
active
07812611
ABSTRACT:
A method for determining electrical properties of a submarine petroleum fluid-bearing formation (1) under overburden geological layers (2) of thickness (s) under a seafloor (3) of a sea. The method includes:*arranging one or more transmitter antennas (9) in the sea, and arranging one or more electromagnetic receivers (8) in the sea, *the sea having a shallow sea depth (d) of 50-350 meters; *using the transmitter antenna (9) transmitting electromagnetic signals (10) of one or more pulses (11) having frequency of very low frequency between 0.01 Hz and 0.10 Hz; *using the receiver antennas (8) having an offset from the transmitter (9), for receiving propagated electro-magnetic signals (12) due to the emitted electromagnetic signals (10); *analyzing one or more components of the received signals (12) from receivers (8) having offsets between about 1 km and 12 km, whether the signals (12) differ significantly from a corresponding signal that would occur from a water-bearing formation (1), indicating a petroleum fluid-bearing formation (1).
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Farrelly Brian Anthony
Johnstad Svein Erling
LeDynh Bot L
Norsk Hydro ASA
Wenderoth , Lind & Ponack, L.L.P.
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