Measuring Electromagnetic Source Geometry
OwnerErik Vigen, Nicolas Goujoninventors
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Abstract
An electromagnetic source for electromagnetic survey of a subsea formation includes a towfish configured to be towed by a surface vessel; a plurality of electrodes attached to the towfish; and an acoustic ranging system having acoustic components individually attached to each of the towfish and the plurality of electrodes, wherein the acoustic ranging system is configured to determine a geometry of the plurality of electrodes.
Claims22
An electromagnetic source for electromagnetic survey of a subsea formation, comprising:
- a towfish configured to be towed by a surface vessel;
- a plurality of electrodes attached to the towfish;
- and
- an acoustic ranging system having acoustic components individually attached to each of the towfish and the plurality of electrodes, wherein the acoustic ranging system is configured to determine a geometry of the plurality of electrodes.
A system for electromagnetic survey of a subsea formation, comprising:
- a plurality of electromagnetic receivers for positioning on a seafloor;
- and
- an electromagnetic source for towing by a surface vessel at a selected distance above the seafloor, wherein the electromagnetic source comprises:
- a towfish configured to be towed by the surface vessel,
- a plurality of electrodes attached to the towfish, and
- a first acoustic ranging system having acoustic components individually attached to each of the towfish and the plurality of electrodes.
A method for electromagnetic survey of a subsea formation, comprising:
- deploying a plurality of electromagnetic receivers on a seafloor;
- transmitting an electromagnetic field into the subsea formation using an electromagnetic source towed by a surface vessel at a selected distance above the seafloor, wherein the electromagnetic source comprises:
- a towfish configured to be towed by the surface vessel;
- a plurality of electrodes attached to the towfish;
- and
- an acoustic ranging system having acoustic components individually attached to each of the towfish and the plurality of electrodes;
- detecting electromagnetic signals returned from the subsea formation;
- and
- determining a geometry of the plurality of electrodes of the electromagnetic source using the acoustic ranging system.
Dependencies are inferred from the claim text.