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Radon Transforms in Tau-P space and Multiple Removal

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Presentation on theme: "Radon Transforms in Tau-P space and Multiple Removal"— Presentation transcript:

1 Radon Transforms in Tau-P space and Multiple Removal

2 The TAU-P transform is another special case of RADON transform where the data are decomposed as a series of straight lines which map to points in the tau-p domain. Hyperbolic events (e.g. those in shot gathers) map to elliptical curves in Tau-P. This process also used to be referred to as slant-stacking since to produce the tau-p domain the input data may be stacked along a series of straight lines. The tau-p process is becoming common prior to predictive deconvolution for multiple suppression since this performs more accurately in the tau-p domain. The tau-p transform may also be used to optimally isolate and filter guided waves, refractions and types of interference. Filtering in the tau-p domain is usually more expensive than in the F-K domain, but can produce better quality results.

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4 Offset P ( slowness) Time ( Intercept Time) Tau

5 The Linear Radon Transform Reducing the Image to Plane Waves
(Slant Stack)

6 The ideas is that the event can be reduced to a series of plane waves
Offset P ( slowness) Time ( Intercept Time) Tau The ideas is that the event can be reduced to a series of plane waves

7 Offset P ( slowness) Time ( Intercept Time) Tau

8 Offset P ( slowness) Time ( Intercept Time) Tau

9 Offset P ( slowness) Time ( Intercept Time) Tau

10 Offset P ( slowness) Time ( Intercept Time) Tau

11 Offset P ( slowness) Time ( Intercept Time) Tau

12 Offset P ( slowness) Time ( Intercept Time) Tau

13 Offset P ( slowness) Time ( Intercept Time) Tau

14 Offset P ( slowness) Time ( Intercept Time) Tau

15 Offset P ( slowness) Time ( Intercept Time) Tau

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17 Offset P ( slowness) Time ( Intercept Time) Tau

18 Offset P ( slowness) Time ( Intercept Time) Tau

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20 Offset P ( slowness) Time ( Intercept Time) Tau

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22 Offset P ( slowness) Time ( Intercept Time) Tau

23 Offset P ( slowness) Time ( Intercept Time) Tau

24 Offset P ( slowness) Time ( Intercept Time) Tau

25 Offset P ( slowness) Time ( Intercept Time) Tau

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29 Offset P ( slowness) Time ( Intercept Time) Tau

30 Offset P ( slowness) Time ( Intercept Time) Tau

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39 Offset P ( slowness) Time ( Intercept Time) Tau

40 Offset P ( slowness) Time ( Intercept Time) Tau

41 Offset P ( slowness) Time ( Intercept Time) Tau

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44 Offset P ( slowness) Time ( Intercept Time) Tau

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46 Offset P ( slowness) Time ( Intercept Time) Tau

47 Time Offset P ( slowness) ( Intercept Time) Tau

48 Offset P ( slowness) Time ( Intercept Time) Tau

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50 Time Offset P ( slowness) ( Intercept Time) Tau

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60 Time Offset P ( slowness) ( Intercept Time) Tau

61 Time Offset P ( slowness) ( Intercept Time) Tau

62 Time Offset P ( slowness) ( Intercept Time) Tau

63 Time Offset P ( slowness) ( Intercept Time) Tau

64 Time Offset P ( slowness) ( Intercept Time) Tau

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67 Time Offset P ( slowness) ( Intercept Time) Tau

68 Time Offset P ( slowness) ( Intercept Time) Tau

69 Time Offset P ( slowness) ( Intercept Time) Tau

70 Time Offset P ( slowness) ( Intercept Time) Tau

71 Time Offset P ( slowness) ( Intercept Time) Tau

72 Time Offset P ( slowness) ( Intercept Time) Tau

73 Time Offset P ( slowness) ( Intercept Time) Tau

74 Time Offset P ( slowness) ( Intercept Time) Tau

75 Time Offset P ( slowness) ( Intercept Time) Tau

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77 Time Offset P ( slowness) ( Intercept Time) Tau

78 Time Offset P ( slowness) ( Intercept Time) Tau

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80 Time Offset P ( slowness) ( Intercept Time) Tau

81 Time Offset P ( slowness) ( Intercept Time) Tau

82 Time Offset P ( slowness) ( Intercept Time) Tau

83 Time Offset P ( slowness) ( Intercept Time) Tau

84 Time Offset P ( slowness) ( Intercept Time) Tau

85 Time Offset P ( slowness) ( Intercept Time) Tau

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88 Time Offset P ( slowness) ( Intercept Time) Tau

89 Time Offset P ( slowness) ( Intercept Time) Tau

90 Time Offset P ( slowness) ( Intercept Time) Tau

91 Time Offset P ( slowness) ( Intercept Time) Tau

92 Time Offset P ( slowness) ( Intercept Time) Tau

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97 Time Offset P ( slowness) ( Intercept Time) Tau

98 Time Offset P ( slowness) ( Intercept Time) Tau

99 Time Offset P ( slowness) ( Intercept Time) Tau

100 Time Offset P ( slowness) ( Intercept Time) Tau

101 Time Offset P ( slowness) ( Intercept Time) Tau

102 Time Offset P ( slowness) ( Intercept Time) Tau

103 Time Offset P ( slowness) ( Intercept Time) Tau

104 Time Offset P ( slowness) ( Intercept Time) Tau

105 Time Offset P ( slowness) ( Intercept Time) Tau

106 Time Offset P ( slowness) ( Intercept Time) Tau

107 Time Offset P ( slowness) ( Intercept Time) Tau

108 Time Offset P ( slowness) ( Intercept Time) Tau

109 Time Offset P ( slowness) ( Intercept Time) Tau

110 Time Offset P ( slowness) ( Intercept Time) Tau

111 Time Offset P ( slowness) ( Intercept Time) Tau

112 Time Offset P ( slowness) ( Intercept Time) Tau

113 Time Offset P ( slowness) ( Intercept Time) Tau

114 Time Offset P ( slowness) ( Intercept Time) Tau

115 Time Offset P ( slowness) ( Intercept Time) Tau

116 Time Offset P ( slowness) ( Intercept Time) Tau

117 The ideas is that the event can be reduced to a series of plane waves
Offset P ( slowness) Time ( Intercept Time) Tau The ideas is that the event can be reduced to a series of plane waves Since this is a “transform”, the data can be re-generated from the Tau-P stack

118 Adding the first order multiples and the direct arrivals
Offset P ( slowness) Time ( Intercept Time) Tau Adding the first order multiples and the direct arrivals

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121 Parabolic or Hyperbolic Radon Transform
For Multiple Removal

122 Offset Residual Moveout Curves P ( slowness) Time ( Intercept Time) Tau After flattening the primary events, the multiples display residual moveourt

123 “Multiples only” model
Offset Residual Moveout Curves P ( slowness) Time ( Intercept Time) Tau “Multiples only” model

124 The multiple model is subtracted from the NMO corrected gather
Offset Multiple model Multiple subtraction Time The multiple model is subtracted from the NMO corrected gather

125 Noise elimination and the Radon transform
By BRIAN RUSSELL and DAN HAMPSON Hampson-Russell Software Services Calgary, Canada and JOONG CHUN Oryx Energy Dallas, Texas GEOPHYSICS: THE LEADING EDGE OF EXPLORATION OCTOBER 1990

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