Reciprocal method two-way wave equation targeted data selection for improved imaging of complex geologic structures
First Claim
1. A process for imaging seismic data for a prospect that exists within or near structures that obscure or complicate seismic imaging, where the process comprises:
- a) constructing a first geologic model including information about the size, shape and depth of the obscuring or complicating structure along with a prospect location for further understanding;
b) identifying a set of seismic source locations within the seismic data along with seismic acquisition geometry for associated seismic receiver locations to be evaluated with the geologic model;
c) selecting a target on a geologic body for evaluation wherein the target may comprise a portion or an entirety of the prospect location;
d) selecting parameters appropriate for a two-way wave equation propagation of energy;
e) computing two-way wave equation for the wave propagation from the target point sources to the acquisition source and receiver locations;
f) from e) computing, using reciprocity, the energy arriving at the target from a selected acquisition source location and the associated attributes of the arriving energy at the target from the selected acquisition source location;
g) from e) computing, using reciprocity, the wavefield from the target to the receivers associated with the selected acquisition source by the acquisition geometry;
h) from g) computing the energy and the associated attributes received by the receivers associated with the selected source by the acquisition geometry;
i) repeating steps f) through h) for other sources in the selected acquisition geometry;
j) from the energy and attributes recorded in step f) creating attribute displays that provide visual perspective of one or more attributes of the energy propagated to the target from one or more acquisition sources;
k) from the energy and attributes computed in step h) creating attribute displays that provide visual perspective of one or more attributes of the energy associated with one or more acquisition sources propagated from the target to the receivers;
l) analyzing the attribute displays in step j) and step k) to determine the acquisition source/receiver pair information that will provide better imaging of the target; and
m) creating one or more geological images of the substructure using the acquisition source/receiver pair data identified in step l).
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Accused Products
Abstract
The invention relates to seismic imaging where complex geologies are likely to create data that is confusing or ambiguous for a conventional matrix of acquisition source points and receiver locations. With some understanding of the geological substructure, the acquisition source points and receiver locations that optimize the imaging may be found by using a reciprocal two-way wave equation propagation method coupled with a quality geologic model. With this, the acquisition source points and receiver locations that optimize the imaging may be selected and used to better resolve the substructure and avoid the inclusion of data that obscures understanding of the substructure.
20 Citations
24 Claims
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1. A process for imaging seismic data for a prospect that exists within or near structures that obscure or complicate seismic imaging, where the process comprises:
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a) constructing a first geologic model including information about the size, shape and depth of the obscuring or complicating structure along with a prospect location for further understanding; b) identifying a set of seismic source locations within the seismic data along with seismic acquisition geometry for associated seismic receiver locations to be evaluated with the geologic model; c) selecting a target on a geologic body for evaluation wherein the target may comprise a portion or an entirety of the prospect location; d) selecting parameters appropriate for a two-way wave equation propagation of energy; e) computing two-way wave equation for the wave propagation from the target point sources to the acquisition source and receiver locations; f) from e) computing, using reciprocity, the energy arriving at the target from a selected acquisition source location and the associated attributes of the arriving energy at the target from the selected acquisition source location; g) from e) computing, using reciprocity, the wavefield from the target to the receivers associated with the selected acquisition source by the acquisition geometry; h) from g) computing the energy and the associated attributes received by the receivers associated with the selected source by the acquisition geometry; i) repeating steps f) through h) for other sources in the selected acquisition geometry; j) from the energy and attributes recorded in step f) creating attribute displays that provide visual perspective of one or more attributes of the energy propagated to the target from one or more acquisition sources; k) from the energy and attributes computed in step h) creating attribute displays that provide visual perspective of one or more attributes of the energy associated with one or more acquisition sources propagated from the target to the receivers; l) analyzing the attribute displays in step j) and step k) to determine the acquisition source/receiver pair information that will provide better imaging of the target; and m) creating one or more geological images of the substructure using the acquisition source/receiver pair data identified in step l). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification