Method for combining pressure and motion seismic signals from streamers where sensors are not at a common depth
First Claim
1. A method for using signals measured by pressure responsive seismic sensors and motion responsive seismic sensors disposed at spaced apart positions along a seismic cable, the method comprising:
- simulating a selected frequency range response of the motion responsive sensor signals for each of a plurality of selected depths in a body of water;
choosing, for each sensor position along the streamer, the one of the simulated selected frequency range responses for which the selected depth most closely matches an actual sensor depth;
combining the chosen simulated selected frequency range responses with the measured motion responsive signals to provide full bandwidth motion responsive sensor signals; and
using the full bandwidth motion responsive signals and the pressure responsive seismic signals to determine at least one of an upgoing and downgoing component of a pressure or motion wavefield.
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Accused Products
Abstract
A method for using signals measured by pressure responsive seismic sensors and motion responsive seismic sensors disposed in a seismic cable includes simulating a selected range frequency response of the motion responsive sensor signals for each of a plurality of selected depths in a body of water. For each sensor position along the streamer, the one of the simulated selected frequency range responses is selected for which the selected depth most closely matches an actual sensor depth. The selected simulated selected range frequency responses are combined with the measured motion responsive sensor signals to produce full bandwidth motion responsive signals. The full bandwidth signals are combined with the pressure responsive signals to determine at least one of an upgoing and downgoing pressure or motion wavefield.
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Citations
11 Claims
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1. A method for using signals measured by pressure responsive seismic sensors and motion responsive seismic sensors disposed at spaced apart positions along a seismic cable, the method comprising:
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simulating a selected frequency range response of the motion responsive sensor signals for each of a plurality of selected depths in a body of water; choosing, for each sensor position along the streamer, the one of the simulated selected frequency range responses for which the selected depth most closely matches an actual sensor depth; combining the chosen simulated selected frequency range responses with the measured motion responsive signals to provide full bandwidth motion responsive sensor signals; and using the full bandwidth motion responsive signals and the pressure responsive seismic signals to determine at least one of an upgoing and downgoing component of a pressure or motion wavefield. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for seismic surveying, comprising:
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towing at least one streamer having a plurality of spaced apart pressure responsive sensors and motion responsive sensors in a body of water; at selected times actuating a seismic energy source in the water; detecting signals from each of the sensors in response to the acutations of the source; simulating a selected frequency range response of the motion responsive sensor signals for each of a plurality of selected depths in the body of water; choosing, for each sensor position along the at least one streamer, the one of the simulated selected frequency range responses for which the selected depth most closely matches an actual sensor depth; combining the chosen simulated selected frequency range responses with the detected motion responsive signals to provide full bandwidth motion responsive sensor signals; and using the full bandwidth motion responsive signals and the detected pressure responsive seismic signals to determine at least one of an upgoing and downgoing component of a pressure or motion wavefield. - View Dependent Claims (8, 9, 10, 11)
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Specification