1887
Volume 5 Number 3
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

Very shallow seismic surveys, i.e. 20–100 m target depth, require a large bandwidth of high frequencies to ensure detailed resolution. A survey with a small hydraulic vibrator across young glacial structures in northern Germany that gave unsatisfactory results was repeated with monitored vibrator motions. This enabled us to use the groundforce signal as correlation operator and to apply sweep deconvolution.

The application of the groundforce signal resulted in a distinct improvement compared to correlation using the reference sweep, whatever the data compression technique used. This is due to harmonics that show high amplitudes at high frequencies and contribute considerably to signal energy. Sweep deconvolution works at least as well as correlation. Due to the minimum‐phase nature of sweep deconvolved data, this technique, if combined with a minimum‐phase deconvolution, gave the best results. The geological target, consisting of thin interstadials embedded in a sequence of sands deposited during the last glaciation, could be imaged much more clearly than before.

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2018-12-18
2024-04-28
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References

  1. AkiK. and RichardsP.G.1980. Quantitative Seismology: Theory and Methods , Vol. 1. W.H.Freeman & Co.
    [Google Scholar]
  2. AllenK.P., JohnsonM.L. and MayJ.S.1998. High fidelity vibratory seismic (HFVS) method for acquiring seismic data. 68th SEG Meeting, New Orleans, USA, Expanded Abstracts, 140–143.
  3. Baeten, G.J.M., FokkemaJ.T. and ZiolkowskiA.M.1988. Seismic vibrator modelling. Geophysical Prospecting36, 22–65.
    [Google Scholar]
  4. BaetenG.J.M. and ZiolkowskiA.M.1990. The Vibroseis Source . Advances in Exploration Geophysics 3. Elsevier Science Publishing Co.
    [Google Scholar]
  5. BegayD., MillerR., WatneyW. and XiaJ.2000. High‐resolution P‐and S‐wave reflection to detect a shallow gas sand in southeast Kansas. 70th SEG Meeting, Calgary, Canada, Expanded Abstracts, 1319–1322.
  6. BrittleK.F., LinesL.R. and DeyA.K.2001. Vibroseis deconvolution: a comparison of cross‐correlation and frequency‐domain sweep deconvolution. Geophysical Prospecting49, 675–686.
    [Google Scholar]
  7. BrouwerJ. and HelbigK.1998. Shallow High‐Resolution Reflection Seismics. Handbook of Geophysical Exploration 19. Elsevier Science Publishing Co.
    [Google Scholar]
  8. BunessH. and WiederholdH.1999. Experiences with a vibrator system for shallow high‐resolution seismics. 61th EAGE Conference, Helsinki, Finland, Extended Abstracts, session 4042.
  9. ChapmanW.L., BrownG.L. and FairD.W.1981. The vibroseis system: A high frequency tool. Geophysics46, 1657–1666.
    [Google Scholar]
  10. DollW.E., MillerR.D. and XiaJ.1998. A noninvasive shallow seismic source comparison on the Oak Ridge Reservation, Tennessee. Geophysics63, 1318–1331.
    [Google Scholar]
  11. EhlersJ.1994. Allgemeine und Historische Quartärgeologie . Enke (Stuttgart).
    [Google Scholar]
  12. FreundH. and CaspersG.1997. Vegetation und Paläoklima der Weichsel‐Kaltzeit im nördlichen Mitteleuropa. Schriftenreihe der Deutschen Geologischen Gesellschaft4, 1–249.
    [Google Scholar]
  13. GhoseR.2003. Laterally consistent, correct elimination of the source signature in shallow, high‐resolution seismic reflection surveys: possibility and benefits. 9th EEGS Meeting, Prague, Expanded Abstracts, session O‐035.
  14. GhoseR., NijhofV., BrouwerJ., MatsubaraY., KaidaY. and TakahashiT.1998. Shallow to very shallow, high‐resolution reflection seismic using a portable vibrator system. Geophysics63, 1295–1309.
    [Google Scholar]
  15. LiX.‐P.1997. Elimination of ghost noise in vibroseis data by deconvolution. Geophysical Prospecting45, 909–929.
    [Google Scholar]
  16. LiX.‐P., SöllnerW. and HubralP.1995. Elimination of harmonic distortion in vibroseis data. Geophysics60, 503–516.
    [Google Scholar]
  17. MartinJ.E. and JackI.G.1990. The behaviour of a seismic vibrator using different phase control methods and drive levels. First Break8(11), 404–414.
    [Google Scholar]
  18. MillerR., CloughJ., BarkerC. and DavisJ.2002. High‐resolution seismic reflections to delineate coal beds >350 m deep, with some <3 m thick, under Fort Yukon, Alaska. 72th SEG Meeting, Salt lake City, USA, Expanded Abstracts, 1488–1491.
    [Google Scholar]
  19. MillerR.D., RademackerT.R. and LambrechtJ.L.2004. Field test of two high‐frequency vibrators with two high‐frequency servovalves at two sites in Kansas (U.S.) with near‐surface emphasis. 74th SEG Meeting, Denver, USA, Expanded Abstracts, session NSG 4.1.
  20. NijhofV.1989. Portable high frequency vibrator for high resolution shallow seismic profiling. 59th SEG Meeting, Dallas, USA, Expanded Abstracts, 670–673.
  21. OkayaD.A., KarageorgiE., McEvillyT.V. and MalinP.E.1992. Removing vibrator‐induced correlation artifacts by filtering in frequency‐uncorrelated space. Geophysics, 57, 916–926.
    [Google Scholar]
  22. PolomU.1997. Elimination of source‐generated noise from the correlated vibroseis data (the ‘ghost‐sweep’ problem). Geophysical Prospecting45, 571–591.
    [Google Scholar]
  23. ReustD.K.1993. Enhanced servovalve technology for seismic vibrators. Geophysical Prospecting41, 43–60.
    [Google Scholar]
  24. RietschE.1981. Reduction of harmonic distortion in vibratory source records. Geophysical Prospecting29, 178–188.
    [Google Scholar]
  25. RistowD. and JurczykD.1975. Vibroseis deconvolution. Geophysical Prospecting23, 363–379.
    [Google Scholar]
  26. RobinsonE.A.1999. Seismic Inversion and Deconvolution, Part B: Dual‐Sensor Technology . Handbook of Geophysical Exploration 4b. Elsevier Science Publishing Co.
    [Google Scholar]
  27. RobinsonE.A. and SaggafM.2001. Klauder wavelet removal before vibroseis deconvolution. Geophysical Prospecting49, 335–340.
    [Google Scholar]
  28. SallasJ.J.1984. Seismic vibrator control and the downgoing P‐wave. Geophysics49, 731–740.
    [Google Scholar]
  29. ScheffersB.C., ArtsR.J., MeekesS.A.C. and OtteW.M.A.1997. Special aspects of acquisition of 2D HRS data using dynamite and Vibroseis sources. 59th EAGE Conference, Geneva, Switzerland, Extended Abstracts, session P045.
  30. SchrodtJ.K.1987. Techniques for improving vibroseis data. Geophysics52, 469–482.
    [Google Scholar]
  31. SeriffA.J. and KimW.R.1970. The effect of harmonic distortion in the use of vibratory surface sources. Geophysics35, 234–246.
    [Google Scholar]
  32. TruskowskiM. and WarnerJ.2004. Fault and fracture Ssystem delineation of a bedrock aquifer. 74th SEG Meeting, Denver, USA, Expanded Abstracts, session NSG 3.1.
  33. van der VeenM., BrouwerJ. and HelbigK.1999. Weighted sum method for calculating ground force: an evaluation by using a portable vibrator system. Geophysical Prospecting47, 251–267.
    [Google Scholar]
  34. van der VeenM., BunessH.A., BükerF. and GreenA.G.2000. Field comparison of high‐frequency seismic sources for imaging shallow (10‐250 m) structures. Journal of Environmental and Engineering Geophysics5(2), 39–56.
    [Google Scholar]
  35. WiederholdH., BunessH. and BramK.1998. Glacial structures in northern Germany revealed by a high‐resolution reflection seismic survey. Geophysics63, 1265–1272.
    [Google Scholar]
  36. WiederholdH. and CaspersG.1997. Seismic investigations at glacial structures in northern Germany. 3rd EEGS Meeting, Aarhus, Expanded Abstracts.
  37. YilmazO.2001. Seismic Data Analysis . Society of Exploration Geophysicists, Tulsa.
    [Google Scholar]
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