System and method for seismic wavefield separation
First Claim
1. A method of creating a filter for use with locally dense seismic data comprising the steps of:
- obtaining survey geometry characteristics from a locally dense seismic survey designed to record characteristics of an elastic or acoustic wavefield, the survey comprising a plurality of groups of receivers, and each group comprising at least three receivers densely spaced from each other;
designing a filter which uses spatial derivatives of the wavefield of order between or including one and the maximum order of spatial derivatives of the wavefield that can be estimated within a group, such that the filter when combining data from within a single group, separates components of some or all of the wavefield arriving at the single group.
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Abstract
A system and method of creating a filter for use with locally dense seismic data is disclosed. The method includes obtaining survey geometry characteristics from a locally dense seismic survey. A filter is designed which uses spatial derivatives of the wavefield of order between (1) and the maximum order of spatial derivatives of the wavefield that can be estimated within a group. The filter can be designed so as to separate up/down going components, p/s components, or both up/down and p/s components. Partial derivatives in space and time of the wavefield can be calculated, using, for example, a taylor series expansion as an approximation. The seismic data is filtered by combining estimated near surface material properties, the seismic data, and the calculated partial derivatives.
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Citations
19 Claims
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1. A method of creating a filter for use with locally dense seismic data comprising the steps of:
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obtaining survey geometry characteristics from a locally dense seismic survey designed to record characteristics of an elastic or acoustic wavefield, the survey comprising a plurality of groups of receivers, and each group comprising at least three receivers densely spaced from each other;
designing a filter which uses spatial derivatives of the wavefield of order between or including one and the maximum order of spatial derivatives of the wavefield that can be estimated within a group, such that the filter when combining data from within a single group, separates components of some or all of the wavefield arriving at the single group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification