Method and apparatus for cancelling nonstationary sinusoidal noise from seismic data
In seismic exploration wherein seismic sources are activated at spaced locations along a line of exploration and the amplitude of reflections are recorded as a function of the time along the line to produce a series of seismic traces each comprised of a sinusoidal noise component and a seismic data component. This patent describes a method of cancelling the sinusoidal noise components from the seismic traces. It comprises the steps of: selecting an amplitude step parameter, a phase step parameter and a frequency step parameter; estimating a first pair of amplitudes, a first frequency and a first phase; providing a first pair of external signal separated by ninety degrees; summing the first pair of external signals at a first point in time to produce a first estimate of the sinusoidal noise component; applying the first estimate of the sinusoidal noise component to provide an estimate of the seismic data component; estimating gradients for the first pair of amplitudes; estimating a next pair of amplitudes; estimating a gradient for the phase; estimating a next phase; estimating a gradient for the frequency; estimating a next frequency; and repeating the steps until the sinusoidal noise estimate for each point in time has been applied to the series of seismic traces.
- Assignee:
- Mobile Oil Corp., New York, NY
- Patent Number(s):
- US 4858199
- Application Number:
- PPN: US 7240305A
- OSTI ID:
- 5240416
- Country of Publication:
- United States
- Language:
- English
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