System and method for estimating seismic material properties
First Claim
1. A method of estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers comprising the steps of:
- receiving data measured by the locally dense group of seismic receivers, the data representing earth motion caused by a seismic wavefield;
estimating local derivatives of the wavefield such that the derivatives are centered at a single location in the vicinity of the receiver group; and
using physical relationships between the estimated derivatives to estimate near-surface material properties in the vicinity of the receiver group.
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Abstract
A method for estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers is disclosed. The method includes receiving seismic data that has been measured by a locally dense group of seismic receivers. Local derivatives of the wavefield are estimated such that the derivatives are centered at a single location preferably using the Lax-Wendroff correction. Physical relationships between the estimated derivatives including the free surface condition and wave equations are used to estimate near-surface material properties in the vicinity of the receiver group. Another embodiment of the invention is disclosed wherein the physical relationships used to estimate material properties are derived from the physics of plane waves arriving at the receiver group, and the group of receivers does not include any buried receivers.
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Citations
19 Claims
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1. A method of estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers comprising the steps of:
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receiving data measured by the locally dense group of seismic receivers, the data representing earth motion caused by a seismic wavefield;
estimating local derivatives of the wavefield such that the derivatives are centered at a single location in the vicinity of the receiver group; and
using physical relationships between the estimated derivatives to estimate near-surface material properties in the vicinity of the receiver group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers comprising:
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a storage configured to store data measured by the locally dense group of seismic receivers, the stored data representing earth motion caused by a seismic wavefield;
a derivative estimator adapted to process the stored data and estimate local derivatives of the wavefield such that the derivatives are centered at a single location in the vicinity of the receiver group; and
a material property estimator adapted to estimate physical relationships between the estimated derivatives to estimate near-surface material properties in the vicinity of the receiver group. - View Dependent Claims (16, 17, 18, 19)
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Specification