Calibration Based on Twist and Orientation for a Towed Object
AssigneePGS Geophysical AS
InventorGeir Andre Motzfeldt Drange
Life of this patent
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Abstract
Calibration based on twist and orientation for towed object can include determining an amount of twist as a function of length of a portion of a towed object based on output of tilt sensors in the portion of the towed object and a model that describes the twist along the portion of the towed object. An orientation of a seismic sensor can be determined based on the determined amount of twist and a position of the seismic sensor along a length of the portion of the towed object. The seismic sensor can be calibrated based on the orientation.
Claims23
A method, comprising:
- determining an amount of twist as a function of length of a portion of a towed object based on output of a plurality of tilt sensors in the portion of the towed object and a model that describes the twist along the portion of the towed object;
- determining an orientation of a seismic sensor in the portion of the towed object based on the determined amount of twist and a position of the seismic sensor along a length of the portion of the towed object;
- and
- calibrating the seismic sensor based on the orientation.
A system, comprising:
- a streamer including a plurality of portions;
- a first steering device coupled to a first end of a particular portion;
- a second steering device coupled to a second end of the particular portion;
- a plurality of tilt sensors coupled to the particular portion;
- a seismic sensor coupled to the particular portion;
- and
- a controller coupled to the streamer and to the first and the second steering devices, wherein the controller is configured to:
- receive output of the plurality of tilt sensors;
- determine an amount of twist as a function of length of the particular portion based on the output and a model that describes twist along the particular portion;
- determine an orientation of the seismic sensor based on a position of the seismic sensor along a length of the particular portion and the determined amount of twist;
- and
- calibrate the seismic sensor based on the orientation.
A non-transitory machine-readable medium storing instructions executable by a processing resource to:
- determine an amount of twist as a function of length of a portion of a towed object based on output of a plurality of tilt sensors in the portion of the towed object and any of a plurality of models that describe the twist along the portion of the towed object;
- determine a respective orientation of each of the plurality of tilt sensors based on the determined amount of twist;
- and
- calibrate a seismic sensor coupled to the portion of the towed object based on the determined respective orientations and a position of the seismic sensor relative to the plurality of tilt sensors.
Dependencies are inferred from the claim text.