Automatic Tracking of Faults by Slope Decomposition
First Claim
1. A computer-implemented method for automatically tracking faults in a 2-D or 3D seismic data volume or cross-section, comprising:
- (a) decomposing the seismic data into local slownesses for seismic data recorded in time, or slopes if the seismic data have undergone depth migration, using a programmed computer; and
(b) identifying voxels in the seismic data which when decomposed into slownesses or slopes span a broader range of slownesses or slopes than other voxels in the seismic data, thereby forming a fault-highlighted data volume or cross-section.
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Abstract
Method for locating fault lines or surfaces in 2-D or 3-D seismic data based on the fact that fault discontinuities in the space domain span a wide range in a local slowness (slope) domain, whereas other dipping events in the space domain data, such as noise, tend to be coherent, and hence will appear focused in the slowness dimension. Therefore, the method comprises decomposing the seismic data (102) by a transformation to the local slowness domain, preferably using Gaussian slowness period packets as the local slowness or slope decomposition technique, thereby avoiding problems with the data stationary assumption. In the local slowness domain, faults may be identified (104) using the principle mentioned above, i.e. that faults are represented as a truncation in the space domain data, hence they will appear broadband in the slowness dimension.
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Citations
13 Claims
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1. A computer-implemented method for automatically tracking faults in a 2-D or 3D seismic data volume or cross-section, comprising:
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(a) decomposing the seismic data into local slownesses for seismic data recorded in time, or slopes if the seismic data have undergone depth migration, using a programmed computer; and (b) identifying voxels in the seismic data which when decomposed into slownesses or slopes span a broader range of slownesses or slopes than other voxels in the seismic data, thereby forming a fault-highlighted data volume or cross-section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification