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Published byTrevion Maggs Modified about 1 year ago

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

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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

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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

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Vibroseis Correlation Yilmaz, 2001

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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

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Gain Recovery Original with Spherical Gain Correction Yilmaz, 2001

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

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Editing

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

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

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Filter Shape

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Band Pass Filter: Resolution Increasing frequency Increasing Bandwidth model

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Bandpass Filter Test TVF = Time Varying Filter

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FK (2D) Filtering t f x k

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FK Filtering

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Spatial Aliasing

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FK Filtering

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FK Spectra before after B4 After

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Convolutional Model * W t =

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Deconvolution conv decon Poor decon

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Deconvolution

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Deconvolution Before Decon After Decon

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