Challenges In presalt depth Imaging of the deepwater Santos Basin, Brazil

摘要

In this paper, we presented a PSDM velocity model building flow in the deepwater Santos Basin and highlighted the three key steps in the model building flow: Albian layer tomography, iterative TOS interpretation, and intrasalt tomography. This flow produced a more accurate velocity model, and allowed us to obtain better presalt images through the advanced imaging algorithm RTM. High-frequency RTM is essential to image presalt structures and stratigraphy. Compared to Kirchhoff migration, a significant presalt image improvement under the rugose TOS was obtained by RTM. An initial TTI PSDM test showed that anisotropic imaging may be important in this area.