Method for removing coherent noise from an array of seismic traces
Patent
·
OSTI ID:6218326
In seismic exploration wherein seismic sources are activated at spaced locations along a line of exploration and the amplitude of reflections from subsurface formations are recorded as a function of time and distance along said line of exploration to produce a time-distance array of seismic traces, said seismic traces is described comprised of seismic signals and coherent noise, a method of processing said seismic traces to remove said coherent noise comprising the steps of: (a) determining the move out of a coherent noise to be removed from said array of seismic traces, (b) determining from said move out a space-time gate containing signal-plus-noise to be extracted from said array of seismic traces, (c) extracting the gated signal-plus-noise from said array of seismic traces, (d) removing move out to flatten noise within said gate and produce a gated signal-plus-noise record, (e) removing trace-to-trace amplitude and time variations of said flattened noise from said gated signal-plus-noise record, (f) filtering said gated signal-plus-noise record with a multichannel filter to reject signal and pass noise to produce a noise estimate, (g) matching said noise estimate to said signal-plus-noise record, and subtracting said matched noise estimate from said gated signal-plus-noise record to produce a signal estimate, (h) applying the inverse of said trace-to-trace amplitude variations to each trace of the signal estimate to recover true amplitude on each trace, and (i) move out restoring said signal estimate into said array of seismic traces to produce a time-distance array of seismic traces free of said coherent noise.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (United States)
- Patent Number(s):
- A; US 5237538
- Application Number:
- PPN: US 7-838178
- OSTI ID:
- 6218326
- Country of Publication:
- United States
- Language:
- English
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