Method for marine seismic exploration
Patent
·
OSTI ID:5806949
A method for marine seismic exploration, comprising the steps of first discharging simultaneously a set number of seismic sources having a known volume V/sub 1/, resulting in several seismic waves with substantially identical form which after reflection by a same series of reflection points are detected by hydrophones as a sum signal of the individual emitted source waves having a frequency range f/sub 1/. The sum signal is subsequently filtered by means of a suitable filter operation having a frequency range f/sub 1/, resulting in a sum signal having substantially equal phase of the individual components in the frequency range f/sub 1/, next discharging simultaneously a set number of seismic sources having a known volume V/sub 2/, different from volume V/sub 1/, resulting in several seismic waves with substantially identical form which after reflection are detected by hydrophones as a sum signal of the individual emitted source waves having a frequency range f/sub 2/. The sum signal is filtered by means of a suitable filter operation having a frequency range f/sub 2/, to obtain substantially equal phase of the individual components in the frequency range f/sub 2/, then repeating the abovementioned procedure of discharging simultaneously seismic sources having a known volume, detecting the several seismic waves after reflection and filtering the sum signals in a suitable way with seismic sources having mutually different volumes V/sub 3/, V/sub 4/-V /SUB n/ respectively. Finally, ''stacking'' the obtained signals, which results in a final ''stacked'' sum signal having a frequency range f/sub 1/-f /SUB n/ .
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 4486864
- OSTI ID:
- 5806949
- Country of Publication:
- United States
- Language:
- English
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