1887
Volume 63 Number 4
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

This work represents a case study concerning the application of reflection seismic imaging methods in the context of geothermal exploration. Our goal is to obtain accurate structural images of a geothermal active area in southern Tuscany. These images will be required in subsequent studies as the input for geological model building and numerical simulation of the heat transport and fluid flow. The target region exhibits great geologic complexity, including strong velocity contrasts, lateral near‐surface inhomogeneities, fracture zones, and significant topography. Those features are typical for a volcanic hard‐rock environment and pose significant challenges to conventional seismic imaging methodology. Therefore, we apply a sophisticated and robust depth imaging workflow to previously acquired surface seismic data. Within our workflow, we focus on estimating the seismic velocities of the predominant rock units and subsequently carry out Kirchhoff pre‐stack depth migration and Fresnel volume migration to obtain high‐resolution images of the subsurface. Our results demonstrate that the applied methodology provides a valueable tool for imaging in a complex environment such as a volcano‐geothermal area. In detail, the resulting reflector images show the main horizons that delineate the Tuscan sedimentary rocks in the target region. The images from standard Kirchhoff migration can be significantly enhanced by utilizing Fresnel volume migration, which eliminates migration artefacts and provides a better result. Moreover, we obtain the migration velocities and depths for an important regional reflector, known as the K‐horizon, which is of major interest for geothermal characterization.

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2015-04-29
2024-03-29
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References

  1. AccainoF., TinivellaU., RossiG. and NicolichR.2005. Imaging of CROP‐18 deep seismic crustal data. Bollettino della Societa Geologica Italiana, Volume Speciale3, 195–204.
    [Google Scholar]
  2. AdamL., BatzleM., LewallenK.T. and van WijkK.2009. Seismic wave attenuation in carbonates. Journal of Geophysical Research114, B06208.
    [Google Scholar]
  3. BatiniF., BertiniG., GianelliG., PandeliE., PuxedduM. and VillaI.M.1985. Deep structure, age and evolution of the Larderello‐Travale geothermal field. Transactions ‐ Geothermal Resources Council9, 253–259.
    [Google Scholar]
  4. BatiniF., BurgassiP.D., CameliG.M., NicolichR. and SquarciP.1978. Contribution to the study of the deep lithospheric profiles; “deep” reflecting horizons in Larderello‐Travale geothermal field. Memorie della Societa Geologica Italiana19, 477–484.
    [Google Scholar]
  5. BatiniF., BrogiA., LazzarottoA., LiottaD. and PandeliE.2003. Geological features of Larderello‐Travale and Mt. Amiata geothermal areas (southern Tuscany, Italy). Episodes26, 239–244.
    [Google Scholar]
  6. BertiniG., CappettiG., DiniI. and LovariF.1995. Deep drilling results and updating of geothermal knowledge of the Monte Amiata area. Proceedings of the World Geothermal Congress. 1283–1286. International Geothermal Association.
  7. BrogiA.2004. Miocene extension in the inner Northern Apennines; the Tuscan Nappe megaboudins in the Mt. Amiata geothermal area and their influence on Neogene sedimentation. Bollettino della Societa Geologica Italiana123, 513–529.
    [Google Scholar]
  8. BrogiA.2006. Neogene extension in the Northern Apennines (Italy); insights from the southern part of the Mt. Amiata geothermal area. Geodinamica Acta19, 33–50.
    [Google Scholar]
  9. BrogiA.2008. The structure of the Monte Amiata volcano‐geothermal area (Northern Apennines, Italy): Neogene‐Quaternary compression versus extension. International Journal of Earth Sciences97, 677–703.
    [Google Scholar]
  10. BrogiA., LazzarottoA., LiottaD. and RanalliG.2003. Extensional shear zones as imaged by reflection seismic lines; the Larderello geothermal field (central Italy). Tectonophysics363, 127–139.
    [Google Scholar]
  11. BunessH.A., von HartmannH., RumpelH.‐M., KrawczykC.M. and SchulzR.2014. Fault imaging in sparsely sampled 3D seismic data using common‐reflection‐surface processing and attribute analysis ‐ a study in the Upper Rhine Graben. Geophysical Prospecting62, 443–452.
    [Google Scholar]
  12. BuskeS., GutjahrS. and SickC.2009. Fresnel volume migration of single‐component seismic data. Geophysics74(6), WCA47–WCA55.
    [Google Scholar]
  13. CameliG.M.1994. Indagine sulla tecnica di acquisizione sismica della linea CROP18. Studi Geologici Camerti1, 13–18.
    [Google Scholar]
  14. CameliG.M., DiniI. and LiottaD.1993. Upper crustal structure of the Larderello geothermal field as a feature of post‐collisional extensional tectonics (southern Tuscany, Italy). Tectonophysics224, 413–423.
    [Google Scholar]
  15. CameliG.M., DiniI. and LiottaD.1998. Brittle/ductile boundary from seismic reflection lines of southern Tuscany (Northern Apennines, Italy). Memorie della Societa Geologica Italiana52, 153–162.
    [Google Scholar]
  16. CasiniM., CiuffiS., FiordelisiA., MazzottiA. and StucchiE.2010. Results of a 3D seismic survey at the Travale (Italy) test site. Geothermics39, 4–12.
    [Google Scholar]
  17. ČervenýV. and SoaresJ.E.P.1992. Fresnel volume ray tracing. Geophysics57, 902–915.
    [Google Scholar]
  18. CyzM.C. and MalinowskiM.M.2013. Comparison of refraction and diving wave tomography statics solution along a regional seismic profile in SE Poland. 75th EAGE conference & exhibition, Extended Abstracts, Tu SP2 13.
  19. DaveyF.J.2010. Crustal seismic reflection measurements across the northern extension of the Taupo volcanic zone, North Island, New Zealand. Journal of Volcanology and Geothermal Research190, 75–81.
    [Google Scholar]
  20. DiniI., CeccarelliA., BrogiA., GiorgiN., GalleniP. and RossiL.2010. Geological evaluation of the base of the Mt. Amiata volcanic complex. Proceedings of the World Geothermal Congress. International Geothermal Association.
  21. EbigboA., NiederauJ., ThorwartM., RiedelM., AlexandrakisC., MarquartG., PechnigR., DiniI. and BertaniR.2015. Simulation of flow and heat transport in a high‐enthalpy reservoir in Tuscany, Italy. Submitted to Proceedings of the World Geothermal Congress. International Geothermal Association.
  22. ElterF. and PandeliE.1991. Structural features of the metamorphic Paleozoic‐Triassic sequences in deep geothermal drillings of the Mt Amiata area (SE Tuscany Italy). Bolletino Societa Italiana110, 511–522.
    [Google Scholar]
  23. GianelliG., ManzellaA. and PuxedduM.1997. Crustal models of the geothermal areas of southern Tuscany (Italy). Tectonophysics281, 221–239.
    [Google Scholar]
  24. GiustinianiM., TinivellaU. and NicolichR.2015. Reflection seismic sections across the Geothermal Province of Tuscany from reprocessing CROP profiles. Geothermics53, 498–507.
    [Google Scholar]
  25. HlousekF., HellwigO. and BuskeS.2015. Three‐dimensional focused seismic imaging for geothermal exploration in crystalline rock. Geophysical Prospecting63(4), 855–874.
  26. LiottaD. and RanalliG.1999. Correlation between seismic reflectivity and rheology in extended lithosphere; southern Tuscany, inner Northern Apennines, Italy. Tectonophysics315, 109–122.
    [Google Scholar]
  27. LuethS., BuskeS., GieseR. and GoertzA.2005. Fresnel volume migration of multicomponent data. Geophysics70(6), S121–S129.
    [Google Scholar]
  28. MariniL. and ManzellaA.2005. Possible seismic signature of the α−β quartz transition in the lithosphere of Southern Tuscany (Italy). Journal of Volcanology and Geothermal Research148, 81–97.
    [Google Scholar]
  29. MatsushimaJ., OkuboY., RokugawaS., YokotaT., TanakaK., TsuchiyaT.et al. 2003. Seismic reflector imaging by prestack time migration in the Kakkonda geothermal field, Japan. Geothermics32, 79–99.
    [Google Scholar]
  30. RabbelW., ThorwartM., BehrendR., HolzrichterN., NiederauJ., EbigboA., MarquartG., DiniI. and CiuffiS.2015. A stochastic assessment of geothermal potential based on seismic and potential field analysis and hydro‐thermal forward modeling ‐ an example from southern Tuscany (Italy). Submitted to Proceedings of the World Geothermal Congress. International Geothermal Association.
  31. TinivellaU., AccainoF., RossiG. and NicolichR.2005. Petrophysical analysis of CROP‐18 crustal seismic data. Bollettino della Societa Geologica Italiana, Volume Speciale3, 205–211.
    [Google Scholar]
  32. van BergenM.J.1983. Polyphase metamorphic sedimentary xenoliths from Mt. Amiata volcanics (central Italy); evidence for a partially disrupted contact aureole. Geologische Rundschau72, 637–662.
  33. ZhangJ. and YilmazO.2006. 2D and 3D tomography for near‐surface statics corrections. 68th EAGE Conference & Exhibition, Extended Abstracts, P076.
  34. ZhuX., ValasekP., RoyB., ShawS., HowellJ., WhitneyS.et al. 2008. Recent applications of turning‐ray tomography. Geophysics73(5), VE243–VE254.
    [Google Scholar]
  35. ZhuX., YinZ., GuoX., MaY., ZhuX., BertagneA.et al. 2006. Application of advanced imaging technologies to carbonate reservoirs in southern China. The Leading Edge25, 1388–1395.
    [Google Scholar]
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  • Article Type: Research Article
Keyword(s): Geothermal exploration; Seismic imaging; Velocity analysis

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