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US 2004/0176910 A1Published application
Electromagnetic method and apparatus for determining the nature of subterranean reservoirs using refracted electromagnetic waves
AssigneeStatoil ASA
InventorsSvein Ellingsrud, Terje Eidesmo, Harald Westerdahl, Fan-Nian Kong
Life of this patent
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Abstract
A system for investigating subterranean strata. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. Phase information is extracted from a refracted wave response and used to identify the presence and/or nature of a subterranean reservoir.
Claims28
A method for recovering a volume of hydrocarbon from a location in a submarine or subterranean reservoir comprising:
- conducting an electromagnetic survey of the reservoir, the survey method comprising
- (a) deploying an electric dipole transmitter;
- (b) deploying an electric dipole receiver;
- (c) applying an electromagnetic (EM) field to the strata using the transmitter;
- (d) detecting the EM wave field response using the receiver;
- (e) extracting phase information from the wave response;
- (f) repeating procedures (a) through (e) with the transmitter and/or receiver in different locations for a plurality of transmissions;
- and
- (g) using the phase information from the wave response for the plurality of transmissions, in order to determine the presence and/or nature of the reservoir by analyzing the detected wavefield for the presence of a refracted wave component;
- wherein the transmitter is operated at a transmission frequency in the range of 0.01 Hz to 1 kHz for the plurality of transmissions;
- using the electromagnetic survey to determine that a volume of hydrocarbon is present at a location in the reservoir;
- and
- producing the volume of hydrocarbon from a well that penetrates the reservoir near the location in the reservoir.
10 more elements
A method of preparing a survey of a volume of hydrocarbon in a submarine or subterranean reservoir comprising:
- conducting an electromagnetic survey of the reservoir, the survey method comprising
- (a) deploying at least one electric dipole transmitter;
- (b) deploying at least one electric dipole receiver;
- (c) applying an electromagnetic (EM) field to the strata using the transmitter;
- (d) detecting the EM wave field response using the receiver;
- (e) extracting phase information from the wave response;
- (f) repeating procedures (a) through (e) with the transmitter and/or receiver in different locations for a plurality of transmissions;
- and
- (g) using the phase information from the wave response for the plurality of transmissions, in order to determine the presence and/or nature of the reservoir by analyzing the detected wavefield for the presence of a refracted wave component;
- wherein the transmitter is operated at a transmission frequency in the range of 0.01 Hz to 1 kHz for the plurality of transmissions;
- using the electromagnetic survey to determine that a volume of hydrocarbon is present in the reservoir;
- and
- preparing a survey that graphically depicts a location of the volume of hydrocarbon in the reservoir.
10 more elements
Dependencies are inferred from the claim text.