Transcript CFP technology DELPHI consortium CFP method x OWT z TWT x Focusing Operator x OWT x CFP gather z z x t x Data t t * Stack = CFP technology slide 2 CFP method x OWT z TWT Focusing Operator x OWT x CFP gather z z x t x x Data t t * Stack = CFP technology slide 3

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