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CFP technologyCFP technology
DELPHI consortium
CFP technology slide 2
Data
t
x
z
xTWT
CFP methodCFP methodOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 3
CFP methodCFP methodOWT
z
x
Focusing Operator
t
x
*
Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 4
CFP methodCFP method
*
OWT
z
x
Focusing Operator
t
x Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 5
CFP methodCFP method
*
OWT
z
x
Focusing Operator
t
x Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 6
CFP methodCFP method
*
OWT
z
x
Focusing Operator
t
x Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 7
CFP methodCFP method
*
OWT
z
x
Focusing Operator
t
x Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 8
CFP methodCFP method
*
OWT
z
x
Focusing Operator
t
x Data
t
x
z
xTWT
CFP gather
t
x
z
x OWT
=Stack
CFP technology slide 9
Principle of equal traveltimePrinciple of equal traveltimeOWT
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
CFP technology slide 10
Data
t
x
z
xTWT
CFP methodCFP method(erroneous operator)(erroneous operator)
OWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 11
CFP gather
=
t
x
z
x OWT
Stack
CFP methodCFP method (erroneous operator) (erroneous operator)
OWT
z
x
Focusing Operator
t
x
*
Data
t
x
z
xTWT
CFP technology slide 12
CFP methodCFP method (erroneous operator) (erroneous operator)
Data
t
x
z
xTWTOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 13
CFP methodCFP method (erroneous operator) (erroneous operator)
Data
t
x
z
xTWTOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 14
CFP methodCFP method (erroneous operator) (erroneous operator)
Data
t
x
z
xTWTOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 15
CFP methodCFP method (erroneous operator) (erroneous operator)
Data
t
x
z
xTWTOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 16
CFP methodCFP method (erroneous operator) (erroneous operator)
Data
t
x
z
xTWTOWT
z
x
Focusing Operator
t
x
*
CFP gather
=
t
x
z
x OWT
Stack
CFP technology slide 17
Erroneous Focusing Erroneous Focusing OperatorsOperators
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
CFP technology slide 18
Differential Time Shift panelDifferential Time Shift panel
0dt
x*
DTS panel
CFP gather
t
x
z
x OWTOWT
z
x
Focusing Operator
t
x
CFP technology slide 19
Focusing Operator updatingFocusing Operator updating
0dt
x DTS panel
Half of tracked time in DTS panel
Previous input focusing operator
Updated focusing operator
=
+
t
xCFP gather & Focusing Operators
CFP technology slide 20
Iterative Focusing Operator Iterative Focusing Operator updatingupdating
No subsurface model is No subsurface model is involved in this process, only involved in this process, only
seismic data!seismic data!
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