Frequency shift reservoir localization
A method and system of detecting and mapping a subsurface hydrocarbon reservoir includes acquiring seismic data having a plurality of components, applying a data transform to the seismic data to obtain seismic data spectral component maxima and maxima profiles, and recording the maxima or maxima profile in a form for display.
1. A method of processing seismic data comprising:
decomposing, using a processing unit, seismic data from a survey area to obtain spectral component seismic data over a selected frequency range;
selecting, using a processing unit, local first frequency attribute amplitude maxima of the spectral component seismic data over the selected frequency range for a plurality of sensor positions over a survey area;
obtaining, using a processing unit, a frequency maxima profile from the local first frequency attribute amplitude maxima over the survey area;
selecting, using a processing unit, second frequency attribute amplitude maxima over the selected frequency range;
obtaining, using a processing unit, a frequency maxima profile from the second frequency attribute amplitude maxima over the survey area; and
locating, using a processing unit, a subsurface hydrocarbon reservoir based on the relative strengths of the frequency attribute amplitude maxima over the survey area.
2. The method of claim 1 further comprising selecting a third amplitude maxima over the selected frequency range and obtaining a frequency maxima profile from the third amplitude maxima over the survey area.
3. The method of claims 1 or 2 further comprising locating a subsurface hydrocarbon reservoir based on the relative strengths of a maxima envelope of the first, second and third frequency maxima over the selected frequency range.
4. The method of claim 1 further comprising displaying the local amplitude maxima as a map over the survey area.
5. The method of claim 1 wherein the spectral component is obtained by: applying a data transform to a plurality of orthogonal components of motion for the naturally occurring low frequency background seismic data.
6. The method of claim 1 wherein decomposing seismic data further comprises smoothing the spectral component.