GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.3 ______ ___ GNGTS 2023 Discussion and Conclusions Mapping small diameter structures such as salt diapirs, magmatic or mud volcanic structures, pockmarks, etc. is a common problem when interpreting 2D seismic profiles: generally, the distance between profiles is too large to realistically represent the 3D distribution of the same structures. This problem could be solved only by the availability of 3D seismic data, which are generally difficult to access. The use of 2D data leads to difficulties in the realistic representation of the structural maps of the horizons and does not provide useful information for calculating the distribution of thicknesses above or below the same horizons and the corresponding volumes. In this work a method is proposed to produce a non-real but more realistic structural map of horizons affected by high-frequency deformation, by applying a “reasoned” extrapolation of the contour using the convergent interpolation algorithm with selected parameters and filters.  The result provides a realistic position of the structures rather than a real one. This approach better represents the picture of the structures’ distribution and, in particular, allows a better measurement of the volume involved in the deformation process. References Bellucci M., Aslanian D., Moulin M., Rabineau M., Leroux E., Pellen R., Poort J., Del Ben A., Gorini C., Camerlenghi A.; 2021: Salt morphologies and crustal segmentation relationship: New insights from the Western Mediterranean Sea. Earth-Science Reviews 222, 103-818. Blondel S., Ford J.; 2022: Multi-channel seismic reflection profiles SALTFLU (Salt deformation and sub-salt fluid circulation in the Algero-Balearic abyssal plain) - Pre-Stack Kirchhoff Time & Depth Migration 2022 (Version 1) [Data set]. Zenodo. Dal Cin M., Del Ben A., Mocnik A., Accaino F., Geletti R., Wardell N., Zgur F., Camerlenghi A.; 2016: Seismic imaging of Late Miocene (Messinian) evaporites from Western Mediterranean back-arc basins . Pet. Geosci. 22 (4), 297–308. Geletti R., Zgur F., Del Ben A., Buriola F., Fais S., Fedi M., Forte E., Mocnik A., Paoletti V., Pipan M., Ramella R., Romeo R., Romi A.; 2014: The Messinian Salinity Crisis: New seismic evidence in the West-Sardinian Margin and Eastern Sardo-Provençal basin (West Mediterranean Sea). Marine Geology 351, 76–90. Lofi J., Deverchère J., Gaullier V., Gillet H., Gorini C., Guennoc P., Loncke L., Maillard A., Sage F., Thinon I., Capron A., Obone Zue Obame E.; 2008: The Messinian Salinity Crisis in the offshore domain: an overview of our knowledge through seismic profile interpretation and multi-site approach . CIESM Workshop Monographs 33, 83–90.  Lofi J., Deverchère J., Gaullier V., Gillet H., Gorini C., Guennoc P., Loncke L., Maillard A., Sage F., Thinon I.; 2011: Atlas of the Messinian seismic markers in the Mediterranean and Black Seas. Mémoire Societe Geologique de France n.s. 179 and World Geological Map Commission (72 pp).