System and method for producing local images of subsurface targets
AssigneeChevron U.S.A. Inc.
InventorJoseph Paul Stefani
Life of this patent
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Abstract
Full wavefield images are produced for a target within a geologic volume of interest from which seismic information has been acquired. The images are generated by generating Green's functions for wavefields propagating from a location at or near the target to the surface without requiring imaging of the entire geologic volume of interest.
Claims18
A computer-implemented method of producing local images of a portion of a geologic volume of interest, the method being implemented in a computer system that includes one or more physical processors, the method comprising:
- obtaining an earth model of the geologic volume of interest, the earth model having been generated based on seismic data acquired during one or more seismic measurements performed in accordance with one or more acquisition parameters;
- obtaining a source location in the geologic volume of interest, wherein a position of the source location in the geologic volume of interest is based on a position in the geologic volume of interest of a portion of the geologic volume of interest for which local images are to be generated;
- obtaining a set of receiver locations and a seismic source location in or on the geologic volume of interest, wherein positions of the receiver locations and the seismic source location are toward a surface of the geologic volume of interest from the source location;
- conducting synthetic seismic acquisition on the earth model that synthesizes a seismic source at the source location;
- determining, from the results of the synthetic seismic acquisition, a first set of Green's functions that describe the seismic wave field propagating from the source location to the set of receiver locations and the seismic source location.
A system configured to produce local images of a portion of a geologic volume of interest, the system comprising:
- one or more processors configured to execute computer program modules, the computer program modules comprising:
- an earth model module configured to obtain an earth model of the geologic volume of interest, the earth model having been generated based on seismic data acquired during one or more seismic measurements performed in accordance with one or more acquisition parameters;
- a source location module configured to obtain a source location in the geologic volume of interest, wherein a position of the source location in the geologic volume of interest is based on a position in the geologic volume of interest of a portion of the geologic volume of interest for which local images are to be generated;
- a measurement location module configured to obtain a set of receiver locations and a seismic source location in or on the geologic volume of interest, wherein positions of the receiver locations and the seismic source location are toward a surface of the geologic volume of interest from the source location;
- a synthetic seismic module configured to conduct synthetic seismic acquisition on the earth model that synthesizes a seismic source at the source location;
- a Green's function module configured to determine, from the results of the synthetic seismic acquisition, a first set of Green's functions that describe the seismic wave field propagating from the source location to the set of receiver locations and the seismic source location.
Non-transient electronic storage media that stores computer readable instructions configured to cause one or more processors to perform a method of producing local images of a portion of a geologic volume of interest, the method comprising:
- obtaining an earth model of the geologic volume of interest, the earth model having been generated based on seismic data acquired during one or more seismic measurements performed in accordance with one or more acquisition parameters;
- obtaining a source location in the geologic volume of interest, wherein a position of the source location in the geologic volume of interest is based on a position in the geologic volume of interest of a portion of the geologic volume of interest for which local images are to be generated;
- obtaining a set of receiver locations and a seismic source location in or on the geologic volume of interest, wherein positions of the receiver locations and the seismic source location are toward a surface of the geologic volume of interest from the source location;
- conducting synthetic seismic acquisition on the earth model that synthesizes a seismic source at the source location;
- determining, from the results of the synthetic seismic acquisition, a first set of Green's functions that describe the seismic wave field propagating from the source location to the set of receiver locations and the seismic source location.
Dependencies are inferred from the claim text.