Method of determining the response caused by model alterations in seismic simulations
First Claim
1. Method of determining the seismic response to seismic energy propagating through an Earth model, comprising the steps ofdetermining the seismic response within an outer finite-difference grid;
- storing said first response at grid points forming at least one source injection boundary enclosing a sub space of said model;
changing model parameters at grid points within said sub space so as to generate an altered Earth model;
subsequently determining a second seismic response within at least one inner finite-difference grid, said inner grid enclosing said at least one source injection boundary and being enclosed in said outer finite-difference grid, using energy propagated from said at least one source injection boundary.
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Abstract
Described is a finite-difference methodology for efficiently computing the seismic response from a seismic model subject to several changes within sub-volumes. Initially, the response from an original model is calculated and the wave field is recorded at receivers and along closed surfaces around the sub-volumes. As changes occur, the recorded seismograms can be updated by simulating the response on small models encompassing the immediate neighborhood of the regions of change, the recording locations, and the parts of model that contribute to subsequent reflections and scattering recorded at the receivers. The recorded wave field can then be added to the reference wave field to obtain the seismic responses of alterations to the model without having to recalculate the full altered model.
87 Citations
11 Claims
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1. Method of determining the seismic response to seismic energy propagating through an Earth model, comprising the steps of
determining the seismic response within an outer finite-difference grid; -
storing said first response at grid points forming at least one source injection boundary enclosing a sub space of said model; changing model parameters at grid points within said sub space so as to generate an altered Earth model; subsequently determining a second seismic response within at least one inner finite-difference grid, said inner grid enclosing said at least one source injection boundary and being enclosed in said outer finite-difference grid, using energy propagated from said at least one source injection boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification