Spectrally-shaped air gun arrays
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United States of America Patent
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Apr 26, 1988
Grant Date -
N/A
app pub date -
Mar 2, 1987
filing date -
Mar 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a method of shaping the spectrum of a seismic source signature. Energy is concentrated in the range below a selected frequency and attenuated in the range above the selected frequency by activating a plurality of sources asynchronously within a time window of selected duration. In a preferred embodiment, the frequency spectrum is smoothed by firing a second plurality of sources within a second time window having a time delay from the first time window equal to substantially the time between the initial firing of a source and the first positive zero-crossing of the signature.
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