Seismic Reflection Processing Pre-Stack
description
Transcript of Seismic Reflection Processing Pre-Stack
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Basic Seismic ProcessingBasic Seismic ProcessingINPUT
FILTER
CMP Gather
NMO
STACK
MIGRATE
DISPLAY
GEOM
VEL ANAL
STATICS
MUTE
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More Seismic ProcessingMore Seismic Processing
INPUT
BP FILTER CMP Gather
NMO
STACK
MIGRATE
DISPLAY
GEOM
VEL ANAL
STATICSDEMUX
VIB CORR
FK FILTER
DECONDMO/
MIGRATE
SAVE
DECON
FK FILTER
MUTE
GAIN RCVR
COHERENCYENHANCE
COHERENCYENHANCE
TIMETO
DEPTH
EDIT
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Pre-ProcessingPre-Processing
IN
OUT
DEMULTIPLEXING
VIBROSEIS CORRELATION
Pt
Corr St
Raw St
Pt Raw StX =
Issues: Demultiplex skew
Issues: DeSpike B4 Corr Filtered Pilot
Raw S-tPt *=
Yilmaz, 2001
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Vibroseis CorrelationVibroseis Correlation
Yilmaz, 2001
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Gain RecoveryGain Recovery
Options:
•Automatic Gain Control (AGC)• Gain info lost•Spherical Divergence (Need Vt)•Exponential Gain Correction•Programmed Gain Control (PGC)•Trace to Trace Gain Balance •Amplitude Statics
Yilmaz, 2001
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Gain RecoveryGain Recovery
Original
with Spherical Gain Correction
Yilmaz, 2001
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Gain Recovery: AGCGain Recovery: AGC= window length
AGC shadow
Yilmaz, 2001
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EditingEditing
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Band Pass FilterBand Pass Filter
st
t
s’t
t
Input Output
Sf
f f f
S’fRf
rt
Filter
X =
* =
Time domain
Frequency domain
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Bandwidth/Filter LengthBandwidth/Filter Length
Filter length
Bandwidth = f2/f1
50/2535/5
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Filter ShapeFilter Shape
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Band Pass Filter: ResolutionBand Pass Filter: Resolution
Increasing frequency
Increasing Bandw
idth
model model
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Bandpass Filter TestBandpass Filter Test
TVF = Time Varying Filter
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FK (2D) FilteringFK (2D) Filtering
t
f
x
k
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FK FilteringFK Filtering
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Spatial AliasingSpatial Aliasing
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FK FilteringFK Filtering
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FK FilteringFK Filtering
FK Spectra
before
after
B4
After
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Convolutional ModelConvolutional Model
* W t=
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DeconvolutionDeconvolution
conv
decon
Poor decon
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DeconvolutionDeconvolution
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DeconvolutionDeconvolution
Before Decon After Decon