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CFP technology DELPHI consortium
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slide 2 CFP technology Data t x z x TWT CFP method OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 3 CFP technology CFP method OWT z x Focusing Operator t x * Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 4 CFP technology CFP method * OWT z x Focusing Operator t x Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 5 CFP technology CFP method * OWT z x Focusing Operator t x Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 6 CFP technology CFP method * OWT z x Focusing Operator t x Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 7 CFP technology CFP method * OWT z x Focusing Operator t x Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 8 CFP technology CFP method * OWT z x Focusing Operator t x Data t x z x TWT CFP gather t x z x OWT = Stack
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slide 9 CFP technology Principle of equal traveltime OWT z x Focusing Operator t x CFP gather t x z x OWT Operator: response of one point in the subsurface CFP gather: response of the same point in the subsurface Operator and CFP gather have the same travel times for the same focal point
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slide 10 CFP technology Data t x z x TWT CFP method (erroneous operator) OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 11 CFP technology CFP gather = t x z x OWT Stack CFP method (erroneous operator) OWT z x Focusing Operator t x * Data t x z x TWT
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slide 12 CFP technology CFP method (erroneous operator) Data t x z x TWT OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 13 CFP technology CFP method (erroneous operator) Data t x z x TWT OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 14 CFP technology CFP method (erroneous operator) Data t x z x TWT OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 15 CFP technology CFP method (erroneous operator) Data t x z x TWT OWT z x Focusing Operator t x * CFP gather = t x z x OWT Stack
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slide 16 CFP technology CFP method (erroneous operator) Data t x z x TWT OWT z x Focusing Operator t x *
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slide 17 CFP technology Erroneous Focusing Operators Depth -10 % Depth + 10% Depth - 10% Vel + 10%Vel - 10%No error Correct focusing operator is in between: erroneous Operator and its related erroneous CFP gather
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slide 18 CFP technology Differential Time Shift panel 0 dt x * DTS panel OWT z x Focusing Operator t x
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slide 19 CFP technology Focusing Operator updating 0 dt x DTS panel Half of tracked time in DTS panel Previous input focusing operator Updated focusing operator = + t x CFP gather & Focusing Operators
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slide 20 CFP technology Iterative Focusing Operator updating No subsurface model is involved in this process, only seismic data!
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