Concurrent phase angle graphic analysis
First Claim
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1. A method of manipulating waveform data, said method comprising the steps of:
- (a) defining a background trend for non-target data;
(b) comparing a plurality of phase angles of target data to the background trend; and
(c) selecting the phase angle of the target data having the maximum deviation from the background trend.
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Abstract
Waveform data, such as reflection seismic data, is filtered by concurrently analyzing various phase angles of the data. The various phase angles of the data are compared to phase rotated background trends and the phase angle producing the maximum deviation from the equivalent background trend is selected as the optimum phase angle for predictive analysis or exclusion filtering.
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Citations
30 Claims
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1. A method of manipulating waveform data, said method comprising the steps of:
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(a) defining a background trend for non-target data;
(b) comparing a plurality of phase angles of target data to the background trend; and
(c) selecting the phase angle of the target data having the maximum deviation from the background trend. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 27)
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9. A method of filtering sinusoidal target data representing a target location using sinusoidal background data representing a non-target location, said method comprising the steps of:
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(a) plotting a plurality of phase angles of the background data;
(b) defining a background trend for each plotted phase angle of the background data;
(c) plotting a plurality of phase angles of the target data;
(d) calculating the distance between each phase angle of the plotted target data and the background trend with equivalent phase angle; and
(e) selecting the phase angle of the target data with the maximum calculated distance. - View Dependent Claims (10, 11, 12, 13, 14, 15, 28)
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16. A method of filtering target seismic data representing a target subterranean location using background seismic data representing a background subterranean location, said target and background seismic data including information about a certain rock property of interest, said rock property of interest providing important information about the target location when the value of the rock property of interest is within a critical range, said background seismic data indicating a value for the rock property of interest that is outside the critical range, said method comprising the steps of:
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(a) plotting a plurality of phase angles of the background seismic data;
(b) defining a background trend for each phase angle of the plotted background seismic data;
(c) plotting a plurality of phase angles of a first sample of the target seismic data;
(d) for each plotted phase angle of the first sample, calculating a distance to the background trend of corresponding phase angle; and
(e) selecting the phase angle of the first sample with the largest calculated distance. - View Dependent Claims (17, 18, 19, 29)
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20. A method of predicting rock properties of a subterranean formation using reflection seismic data and well log data, said method comprising the steps of:
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(a) generating reflection seismic traces from the reflection seismic data;
(b) generating synthetic seismic traces from the well log data;
(c) correlating the reflection seismic traces with the synthetic seismic traces using a plurality of common seismic attributes of the reflection and synthetic seismic traces, said correlation including the substeps of;
(c1) plotting a plurality of phase angles of a first sample of the reflection seismic data;
(c2) calculating a distance between the plotted first sample and a background trend for each of the phase angles of the first sample; and
(c3) using for said correlation, the phase angle of the first sample having the maximum calculated distance; and
(d) assigning well log data associated with the synthetic seismic traces to the reflection seismic traces based on said correlation. - View Dependent Claims (21, 22, 23, 24, 25, 26, 30)
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Specification