Reverse-time depth migration with reduced memory requirements
First Claim
1. A method for computing prestack reverse-time migration of recorded seismic data, comprising:
- creating a discretized model containing a volume enclosed by boundaries with arbitrary boundary conditions;
forward propagating a source wave over the volume based upon the source data;
saving values of the wavefield created by the source wave at an interface between the boundaries and the migration volume;
back propagating receiver waves based upon the receiver data;
back propagating the source wave by using the saved values of the wavefield as time-varying boundary conditions, for the same time intervals as the back propagation of the receiver data; and
correlating the back propagated source wave and back propagated receiver data.
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Abstract
A method of prestack reverse-time migration of seismic data that yields significant gains in computer storage and memory bandwidth efficiency is disclosed. The values only of the source wave incident on the boundaries of a simulation domain are saved, rather than all of the values of the wavefield throughout the entire simulation domain. This data allows an accurate and robust approximation of the forward propagated source wave for all finite-difference approximation orders of the acoustic wave equation. The method reduces the amount of data storage required by an order of magnitude and overcomes the present challenge of requiring special large memory hardware while allowing for the implementation of 3D prestack reverse-time migration on off-the-shelf platforms.
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Citations
27 Claims
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1. A method for computing prestack reverse-time migration of recorded seismic data, comprising:
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creating a discretized model containing a volume enclosed by boundaries with arbitrary boundary conditions; forward propagating a source wave over the volume based upon the source data; saving values of the wavefield created by the source wave at an interface between the boundaries and the migration volume; back propagating receiver waves based upon the receiver data; back propagating the source wave by using the saved values of the wavefield as time-varying boundary conditions, for the same time intervals as the back propagation of the receiver data; and correlating the back propagated source wave and back propagated receiver data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for computing prestack reverse-time migration of recorded seismic data, comprising:
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creating a discretized model containing a volume enclosed by boundaries with arbitrary boundary conditions; back propagating the receiver wave over the volume based upon the receiver data; saving values of the wavefield created by the receiver wave at the boundaries of the migration volume; forward propagating a source wave based upon the source data; forward propagating the receiver wave by using the saved values of the wavefield as time-varying boundary conditions, for the same time intervals as the forward propagation of the source data; and correlating the forward propagated source wave and forward propagated receiver data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A computer-readable storage medium having embodied thereon a program, the program being executable by one or more processors to perform a method for computing prestack reverse-time migration of recorded seismic data, the method comprising:
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creating a discretized model containing a volume enclosed by boundaries with arbitrary boundary conditions; forward propagating a source wave over the volume based upon the source data; saving values of the wavefield created by the source wave at an interface between the boundaries and the migration volume; back propagating receiver waves based upon the receiver data; back propagating the source wave by using the saved values of the wavefield as time-varying boundary conditions, for the same time intervals as the back propagation of the receiver data; and correlating the back propagated source wave and back propagated receiver data.
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Specification