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Deconvolution

The computation of near surface corrections for seismic processing of data in the Taranaki Basin - recent experience Nigel Fisher Kenmore Geophysical. Typical Land Processing Sequence. Amplitude Recovery. Deconvolution. (Refraction) Statics. Velocity Analysis. Residual Statics.

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Deconvolution

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  1. The computation of near surface corrections for seismic processing of data in the Taranaki Basin - recent experience Nigel Fisher Kenmore Geophysical

  2. Typical LandProcessing Sequence AmplitudeRecovery Deconvolution (Refraction) Statics Velocity Analysis Residual Statics Normal Move-out Muting Stack Migration

  3. Typical Land Processing Sequence (with suggested relative importance) AmplitudeRecovery Deconvolution Refraction Statics Velocity Analysis Residual Statics Normal Move-out Muting Stack Migration

  4. Elevation -100 m Base of weathering 0 m * elevation profile Line A : elevation profile and base of weathering

  5. Elevation -200 m Base of weathering -100 m * elevation profile Line B : elevation profile and base of weathering

  6. Weathering static = dt = delay time vw = weathering velocity vr = refractor velocity

  7. Elevation -100 m Base of weathering 0 m * elevation profile Line A : elevation profile and base of weathering

  8. Elevation -100 m 0 m * elevation profile Line A : weathering static applied

  9. -100 m 0 m * elevation profile Line A : weathering static + datuming

  10. …just another inverse problem A * x = b “Matrix” or other operator Observations Unknowns

  11. …and for refraction computation A * x = b Delay Time + Refractor Velocity First Arrivals

  12. Sample shot showing picked first breaks

  13. Pick all first breaks Refraction Computation Refractor Velocity Delay Time

  14. Weathering static = dt = delay time  vw = weathering velocity vr = refractor velocity 

  15. …application of delay time to shot records should align first break energy … so can QC delay time results

  16. Shot showing picked first breaks

  17. Shot showing picked first breaks + delay time

  18. Successive shots + linear move-out

  19. Successive shots + linear move-out + delay time

  20. Delay time profiles, lines A (top) and B

  21. Weathering static = dt = delay time  vw = weathering velocity ? vr = refractor velocity 

  22. … possibilities for estimating vw (i) dynamite source, vw = depth/tuh (ii) estimate vw from near offsets (iii) choose representative constant vw (iv) deep uphole survey - provides static control and sparse estimate of vw

  23. Reprocessed 2003 Differing structure due to how the deep upholes are used Original processing

  24. Reprocessed 2003 E W Differing structure due to how the deep upholes are used Original processing

  25. ... some lines may remain problematic

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