Method and system for efficient extrapolation of a combined source-and-receiver wavefield
AssigneePGS Geophysical AS
InventorNaide Pan
Life of this patent
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Abstract
The current document is directed to computational systems and methods carried out by the computational systems for propagating a combined source-and-receiver wavefield from a first level to a next, second level with respect to depth, time, or another dimension. The methods and systems, to which the current document is directed, apply an efficient complex, combined-source-and-receiver-wavefield propagation operator to a complex combined-source-and-receiver wavefield in order to propagate the complex combined-source-and-receiver wavefield to the next level. Real source and receiver wavefields at the next, second level can then be extracted from the complex combined-source-and-receiver wavefield at the next level.
Claims21
In a technological method of imaging subterranean geological structures that includes:
- accessing sensor data generated during one or more seismic survey passes;
- at least partially characterizing one or more boundary conditions based on the sensor data, including a rough characterization of one or more subterranean features, to generate an initial solution of a wave equation;
- the specific improvement comprising:
- refining the initial solution of the wave equation by iteratively receiving or generating a first and a second derived, second-domain, complex, combined source-and-receiver wavefield at a first level in a first survey dimension, having a common second domain, and applying, to the first and the second derived, second-domain, complex, combined source-and-receiver wavefields at the first level, a propagation operator that propagates one of the first and the second second-domain, complex, combined source-and-receiver wavefields to a corresponding derived, second-domain, complex, combined source-and-receiver wavefield at a next, second level in the first survey dimension;
- and
- constructing an image of the subterranean features based on the iteratively receiving or generating, thereby reducing compute resources used to construct the image.
A method for generating an image of subterranean geological structures, comprising:
- accessing, by a computing system, sensor data generated during one or more seismic survey passes;
- characterizing, by the computing system, one or more boundary conditions based on the sensor data, including a rough characterization of one or more subterranean features, to generate an initial solution of a wave equation;
- refining, by the computing system, the initial solution of the wave equation by iteratively receiving or generating a first and a second derived, second-domain, complex, combined source-and-receiver wavefield at a first level in depth or time, having a common second domain, and applying, to the first and the second derived, second-domain, complex, combined source-and-receiver wavefields at the first level, a propagation operator that propagates one of the first and the second second-domain, complex, combined source-and-receiver wavefields to a corresponding derived, second-domain, complex, combined source-and-receiver wavefield at a next, second level in depth or time;
- and
- constructing, by the computing system, an image of the subterranean features based on the iteratively receiving or generating, thereby reducing compute resources used to construct the image.
A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing system to perform operations comprising:
- accessing sensor data generated during one or more seismic survey passes;
- characterizing one or more boundary conditions based on the sensor data, including a rough characterization of one or more subterranean features, to generate an initial solution of a wave equation;
- refining the initial solution of the wave equation by iteratively receiving or generating a first and a second derived, second-domain, complex, combined source-and-receiver wavefield at a first level in depth or time, having a common second domain, and applying, to the first and the second derived, second-domain, complex, combined source-and-receiver wavefields at the first level, a propagation operator that propagates one of the first and the second second-domain, complex, combined source-and-receiver wavefields to a corresponding derived, second-domain, complex, combined source-and-receiver wavefield at a next, second level in depth or time;
- and
- constructing an image of the subterranean features based on the iteratively receiving or generating.
Dependencies are inferred from the claim text.