US4661935A
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Seismic data processing
Assignee: Phillips Petroleum Co
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Filing: 1984-09-17
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Granted: 1987-04-28
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Expires: 2004-09-17
Abstract
Abstract A variable amplitude/phase color seismic display is provided which increases the ease with which interpreters can locate peaks, troughs and other information of interest.
Inventors
- 👤 Clifford L. Shock
- 👤 Colin Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/32; G01V2210/00; G01V2210/40; G01V2210/48
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
272 words
A method for producing a variable amplitude/phase seismic display from a plurality of real seismic wiggle traces, said method comprising the steps of: (a) selecting a plurality of data points for each one of said plurality of real seismic wiggle traces, wherein said plurality of data points are equally spaced apart; (b) determining the real amplitude for each one of said plurality of data points selected in step (a); (c) determining the instantaneous phase of a plurality of complex seismic wiggle traces corresponding to said plurality of real seismic wiggle traces at each one of the data points selected in step (a); (d) assigning color one, color two, color three or color four to each data point selected in step (a) based on the instantaneous phase, determined in step (c), at each data point, wherein said colors are assigned in accordance with Table I and wherein BA in Table I is a base angle TABLE I
______________________________________
Color Range
______________________________________
one (BA -90°) to (BA -180°)
two BA to (BA -90°)
three BA to (BA +90°)
four (BA +90°) to (BA +180°);
______________________________________ (e) assigning a shade of color one, a shade of color two, a shade of color three or a shade of color four to each data point selected in step (a), wherein the darkness of the shade assigned is based on the amplitude determined in step (b) and wherein the particular color applied to each data point is determined by the instantaneous phase in accordance with step (d); and (f) plotting the color and shade of color assigned to each data point to produce said variable amplitude/phase seismic display.
Claim 2
Independent Claim
272 words
A method for producing a variable amplitude/phase seismic display from a plurality of real seismic wiggle traces, said method comprising the steps of: (a) selecting a plurality of data points for each one of said plurality of real seismic wiggle traces, wherein said plurality of data points are equally spaced apart; (b) determining the real amplitude for each one of said plurality of data points selected in step (a); (c) determining the instantaneous phase of a plurality of complex seismic wiggle traces corresponding to said plurality of real seismic wiggle traces at each one of the data points selected in step (a); (d) assigning color one, color two, color three or color four to each data point selected in step (a) based on the instantaneous phase, determined in step (c), at each data point, wherein said colors are assigned in accordance with Table I and wherein BA in Table I is a base angle TABLE I
______________________________________
Color Range
______________________________________
one (BA -90°) to (BA -180°)
two BA to (BA -90°)
three BA to (BA +90°)
four (BA +90°) to (BA +180°);
______________________________________ (e) assigning a shade of color one, a shade of color two, a shade of color three or a shade of color four to each data point selected in step (a), wherein the darkness of the shade assigned is based on the amplitude determined in step (b) and wherein the particular color applied to each data point is determined by the instantaneous phase in accordance with step (d); and (f) plotting the color and shade of color assigned to each data point to produce said variable amplitude/phase seismic display.
Claim 3
Dependent Claim
15 words
A method in accordance with claim 1 wherein said data points are four milliseconds apart.
Claim 4
Dependent Claim
171 words
A method in accordance with claim 1 wherein said step of determining the instantaneous phase of said plurality of complex seismic wiggle traces comprises: (g) applying a Hilbert transform to each one of said plurality of real seismic wiggle traces to convert each one of said plurality of real seismic wiggle traces to a corresponding imaginary seismic wiggle trace; (h) determining the amplitude of the plurality of imaginary seismic wiggle traces from step (g) at each data point selected in step (a); and (i) determining the instantaneous phase P(t) at each data point selected in step (a) in accordance with equation 1 P(t)=tan.sup.-1 [h(t)/g(t)] (1) wherein h(t) is the amplitude of the imaginary seismic trace at a data point as determined in step (h), wherein g(t) is the amplitude of the real seismic trace at the same data point as determined in step (b) and wherein each one said plurality of complex seismic wiggle traces is a composite of a real seismic wiggle trace and a corresponding imaginary seismic wiggle trace.
Claim 5
Dependent Claim
44 words
A method in accordance with claim 1 wherein the colors assigned in step (d) are assigned in accordance with Table II TABLE II
______________________________________
Color Range
______________________________________
one -90° to -180°
two 0° to -90°
three 0° to +90°
four +90° to +180°
______________________________________
Claim 6
Dependent Claim
43 words
A method in accordance with claim 1 wherein one of sixteen shades of color one, color two, color three or color four is assigned in step (e) to each data point selected in step (a) based on the amplitude determined in step (b).
Claim 7
Dependent Claim
33 words
A method in accordance with claim 5 wherein darker shades of color one, color two, color three or color four are assigned for higher amplitudes and lighter shades are assigned for lower amplitudes.
Claim 8
Independent Claim
185 words
A method for producing a variable amplitude/phase seismic display from a plurality of real seismic wiggle traces, said method comprising the steps of: (a) selecting a plurality of data points for each one of said plurality of real seismic wiggle traces, wherein said plurality of data points are equally spaced apart; (b) determining the real amplitude for each one of the data points selected in step (a); (c) determining the instantaneous phase of a plurality of complex seismic wiggle traces corresponding to said plurality of real seismic wiggle traces at each one of the data points selected in step (a); (d) assigning one of at least two colors to each data point selected in step (a) based on the instantaneous phase, determined in step (c), at each data point; (e) assigning a shade of the color assigned in step (d) to each data point determined in step (a), wherein the darkness of the shade assigned is based on the amplitude determined in step (b); and (f) plotting the color and shade of color assigned to each data point to produce said variable amplitude/phase seismic display.
Claim 9
Independent Claim
185 words
A method for producing a variable amplitude/phase seismic display from a plurality of real seismic wiggle traces, said method comprising the steps of: (a) selecting a plurality of data points for each one of said plurality of real seismic wiggle traces, wherein said plurality of data points are equally spaced apart; (b) determining the real amplitude for each one of the data points selected in step (a); (c) determining the instantaneous phase of a plurality of complex seismic wiggle traces corresponding to said plurality of real seismic wiggle traces at each one of the data points selected in step (a); (d) assigning one of at least two colors to each data point selected in step (a) based on the instantaneous phase, determined in step (c), at each data point; (e) assigning a shade of the color assigned in step (d) to each data point determined in step (a), wherein the darkness of the shade assigned is based on the amplitude determined in step (b); and (f) plotting the color and shade of color assigned to each data point to produce said variable amplitude/phase seismic display.
Claim 10
Dependent Claim
15 words
A method in accordance with claim 7 wherein said data points are four milliseconds apart.
Claim 11
Dependent Claim
171 words
A method in accordance with claim 7 wherein said step of determining the instantaneous phase of said plurality of complex seismic wiggle traces comprises: (g) applying a Hilbert transform to each one of said plurality of real seismic wiggle traces to convert each one of said plurality of real seismic wiggle traces to a corresponding imaginary seismic wiggle trace; (h) determining the amplitude of the plurality of imaginary seismic wiggle traces from step (g) at each data point selected in step (a); and (i) determining the instantaneous phase P(t) at each data point selected in step (a) in accordance with equation 1 P(t)=tan.sup.-1 [h(t)/g(t)] (1) wherein h(t) is the amplitude of the imaginary seismic trace at a data point as determined in step (h), wherein g(t) is the amplitude of the real seismic trace at the same data point as determined in step (b) and wherein each one said plurality of complex seismic wiggle traces is a composite of a real seismic wiggle trace and a corresponding imaginary seismic wiggle trace.
Claim 12
Dependent Claim
40 words
A method in accordance with claim 7 wherein one of sixteen shades of the color assigned in step (d) is assigned in step (e) to each data point selected in step (a) based on the amplitude determined in step (b).
Claim 13
Dependent Claim
30 words
A method in accordance with claim 10 wherein darker shades of the color assigned in step (d) are assigned for higher amplitudes and lighter shades are assigned for lower amplitudes.
References Cited (Backward Citations)
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