We processed the seismic lines CROP-18 and the Tuscany segment of CROP-03, acquired in SouthernTuscany. The analyzed transects were originally designed to highlight deep crustal structures betweenthe major reflector characterizing the geothermal fields (the K-horizon) and the Moho discontinuity.Our main target was to better depict the upper crustal structures, reprocessing the first 4–6s reflectiontimes with the application of advanced techniques (wave equation datuming), improving signal/noiseratio and extracting information previously hidden by approximate static corrections and surface noise.We choose the wave equation datuming technique, a process of upward or downward continuation ofthe wave-field between two arbitrarily shaped surfaces. The wave equation datuming was applied tomove shots and receivers to a given datum plane, removing time shifts related to topography and tonear-surface velocity variations. The datuming procedure largely contributed to attenuate ground roll,enhance higher frequencies, increase resolution and improve the signal/noise ratio.The time migrated output sections show new evidence of regional continuity of high amplitude hori-zons, a better fitting with the surface geological setting and with well data resembling the local industryinvestigations. The interpretation confirms the fluids role, the contribution to the crustal reflectivitymostly by thermo-metamorphic processes and defines the tectonic setting.

Reflection seismic sections across the Geothermal Province of Tuscany from reprocessing CROP profiles.

Giustiniani M;Tinivella U.;
2015

Abstract

We processed the seismic lines CROP-18 and the Tuscany segment of CROP-03, acquired in SouthernTuscany. The analyzed transects were originally designed to highlight deep crustal structures betweenthe major reflector characterizing the geothermal fields (the K-horizon) and the Moho discontinuity.Our main target was to better depict the upper crustal structures, reprocessing the first 4–6s reflectiontimes with the application of advanced techniques (wave equation datuming), improving signal/noiseratio and extracting information previously hidden by approximate static corrections and surface noise.We choose the wave equation datuming technique, a process of upward or downward continuation ofthe wave-field between two arbitrarily shaped surfaces. The wave equation datuming was applied tomove shots and receivers to a given datum plane, removing time shifts related to topography and tonear-surface velocity variations. The datuming procedure largely contributed to attenuate ground roll,enhance higher frequencies, increase resolution and improve the signal/noise ratio.The time migrated output sections show new evidence of regional continuity of high amplitude hori-zons, a better fitting with the surface geological setting and with well data resembling the local industryinvestigations. The interpretation confirms the fluids role, the contribution to the crustal reflectivitymostly by thermo-metamorphic processes and defines the tectonic setting.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.14083/2540
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