GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 3.1 73 Final remarks. We have shown here a technique able to exploit the multiply scattered events contained in the seismic recordings, proving that this kind of events can be a source of valuable information about the subsurface discontinuities. Moreover, we have also shown that these events can enhance the overall quality of the seismic image, providing additional information and illumination in those areas poorly imaged by conventional migration algorithms. In more realist scenarios, though, the information coming from the non linear component of the recorded wave eld can be little as shown in the last example of this paper. The last example also suggests that the deployment of acquisition devices into the subsurface can significantly improve the imaging of the subsurface. Acknowledgements. The authors wish to the SMAART JV consortium for releasing the Sigsbee2b dataset. References Alkhalifah, T., Zuberi, M.; 2011: Imaging by Forward Propagating the Recorded Data - An Analysis . 73rd EAGE Conference & Exhibition incorporating SPE EUROPEC 2011 Vienna, Austria, 23-26 May 2011 Berkhout, A.J., Vershuur, E.; 2006: Imaging of multiple reflections. Geophysics, 71, no. 4, SI209-SI220. Berryhill, J., 1979, Wave-equation datuming : Geophysics, 44, 1329–1344. Berryhill, J., 1984, Wave-equation datuming before stack : Geophysics, 49, 2064–2066. Fleury, C., 2013, Increasing illumination and sensitivity of reverse-time migration with internal multiples : Geophysical Prospecting, 61. Guitton, A.; 2002: Shot-profile migration of multiple reflections . Stanford Exploration Project, Report 111. Lipari, V., Fortini, C., Spadavecchia, E., Bienati, N.; 2012: Prediction of surface-related and inter-bed multiples via Kirchhoff extrapolation . Istanbul 2012 - International Geophysical Conference and Oil & Gas Exhibition: pp. 1-4. Liu, W., and F. Xu, 2011, Wave-equation global datuming : SEG Technical Program Expanded Abstracts 2011. Fig. 3 – Top left: Sigsbee2b stratigraphic model and RTM image obtained from the original dataset (top right). The yellow arrows indicate some of the interfaces not well imaged by conventional RTM and that benefit from the migration of the downgoing internal multiples. Migration of D nl above ( B | A ) �� ����� ���� �������� by using data obtained with FD modeling (bottom left) and RTM receivers datuming (bottom right). The yellow and red arrows point to those interfaces better imaged by the multiples. The blue boxes highlight the bottom of the salt body.