1 / 25

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.

golda
Download Presentation

Deconvolution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related