Basic Seismic Processing INPUT FILTER CMP Gather NMO STACK MIGRATE DISPLAY GEOM VEL ANAL STATICS MUTE.

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Presentation transcript:

Basic Seismic Processing INPUT FILTER CMP Gather NMO STACK MIGRATE DISPLAY GEOM VEL ANAL STATICS MUTE

More Seismic Processing INPUT BP FILTER CMP Gather NMO STACK MIGRATE DISPLAY GEOM VEL ANAL STATICS DEMUX VIB CORR FK FILTER DECON DMO/ MIGRATE SAVE DECON FK FILTER MUTE GAIN RCVR COHERENCY ENHANCE COHERENCY ENHANCE TIME TO DEPTH EDIT

Pre-Processing IN OUT DEMULTIPLEXING VIBROSEIS CORRELATION PtPt Corr S t Raw S t PtPt X= Issues: Demultiplex skew Issues: DeSpike B4 Corr Filtered Pilot Raw S -t PtPt * = Yilmaz, 2001

Vibroseis Correlation Yilmaz, 2001

Gain Recovery Options: Automatic Gain Control (AGC) Gain info lost Spherical Divergence (Need V t ) Exponential Gain Correction Programmed Gain Control (PGC) Trace to Trace Gain Balance Amplitude Statics Yilmaz, 2001

Gain Recovery Original with Spherical Gain Correction Yilmaz, 2001

Gain Recovery: AGC = window length AGC shadow Yilmaz, 2001

Editing

Band Pass Filter stst t s’ t t Input Output SfSf f f f S’ f RfRf rtrt Filter X= * = Time domain Frequency domain

Bandwidth/Filter Length Filter length Bandwidth = f 2 /f 1 50/2535/5

Filter Shape

Band Pass Filter: Resolution Increasing frequency Increasing Bandwidth model

Bandpass Filter Test TVF = Time Varying Filter

FK (2D) Filtering t f x k

FK Filtering

Spatial Aliasing

FK Filtering

FK Spectra before after B4 After

Convolutional Model * W t =

Deconvolution conv decon Poor decon

Deconvolution

Deconvolution Before Decon After Decon