Motion sensors in a marine seismic streamer
OwnerStig Tenghamninventor
Life of this patent
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Abstract
An apparatus is disclosed for determining particle motion in a body of water. The apparatus includes a cable adapted to be towed in the water by a vessel. A first sensor responsive to particle motion in the water is coupled to the cable. A second sensor responsive to particle motion is disposed proximate the first sensor. The second sensor is arranged such that its sensitive axis is disposed at a substantially constant displacement with respect to a sensitive axis of the first sensor. The apparatus also includes means for determining an orientation of at least one of the first and second sensors with respect to Earth's gravity.
Claims18
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A method for determining a vertical component of particle motion of seismic signals in a body of water, comprising:
- measuring seismically induced particle motion in the body of water along a first direction having a determinable orientation with respect to vertical;
- measuring seismically induced particle motion in the body of water along a second direction, the second direction having a known relationship with respect to the first direction;
- and
- combining the measured motions along the first and second directions to obtain the vertical component.
A method for seismic surveying, comprising:
- actuating a seismic energy source in a body of water;
- measuring seismically induced particle motion in the body of water along a first direction having a determinable orientation with respect to vertical;
- measuring seismically induced particle motion in the body of water along a second direction, the second direction having a known relationship with respect to the first direction;
- and
- obtaining a vertical component of the particle motion in the body of water by combining the measured motions along the first and second directions.
Dependencies are inferred from the claim text.