Characterizing Spatial Variability of Surface Waves In Seismic Processing
First Claim
1. A method of processing exploration seismic survey data from a region, wherein the seismic survey data comprises body waves and surface waves, and the region comprises a plurality of locations, the method comprising:
- receiving seismic survey data from at least one sensor;
characterizing spatial variability of a surface wave property for each location in the region, wherein the property is surface wave velocity or an attribute of velocity;
designing filtering criteria to separate at least a portion of the surface waves from the body waves in the seismic survey data using the characterization; and
applying the criteria to the seismic data to remove at least a portion of the surface waves from the seismic survey data.
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Abstract
Embodiments use seismic processing methods that account for the spatial variability of surface wave velocities. Embodiments analyze surface wave properties by rapidly characterizing spatial variability of the surface waves in the seismic survey data (302). Filtering criteria are formed using the spatial variability of the surface waves (204). The filtering criteria can then be used to remove at least a portion of the surface waves from the seismic data (206, 319). The rapid characterization involves estimating a local group velocity of the surface waves by cross-correlation of the analytic signals (302).
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Citations
26 Claims
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1. A method of processing exploration seismic survey data from a region, wherein the seismic survey data comprises body waves and surface waves, and the region comprises a plurality of locations, the method comprising:
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receiving seismic survey data from at least one sensor; characterizing spatial variability of a surface wave property for each location in the region, wherein the property is surface wave velocity or an attribute of velocity; designing filtering criteria to separate at least a portion of the surface waves from the body waves in the seismic survey data using the characterization; and applying the criteria to the seismic data to remove at least a portion of the surface waves from the seismic survey data. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26)
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4. (canceled)
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21. A method of processing seismic data from a region, wherein the seismic data comprises a plurality of traces from a plurality of receivers of a shot source, and the region comprises a plurality of locations, the method comprising:
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converting the traces into complex analytic signals; characterizing a spatial variability of velocities of surface waves for each location in the region by cross-correlating the analytic signals of neighboring traces; and averaging the local group velocity estimates to determine the spatial variability of the surface waves. - View Dependent Claims (22, 23, 24, 25)
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Specification