Imaging and the extended domain

3) Imaging and the extended domain


From least squares imaging to imaging multiples, getting a clear an accurate image of the subsurface is still a challenging problem. 
Our objective in this matter can be summarized as follows:
  a. Imaging multi scattered energy: we continue to use novel approaches for imaging surface and internal multiples. From forward propagating the data as a source to adding a simple cross-correlation step to RTM, we managed to obtain images of multiple scattered energy at a reduced cost.  We also currently focus on least squares implementation of multiple scattered energy imaging to improve its amplitude as a step for a future FWI implementation (Zuberi and Alkhalifah 2011, 2012, 2013; Aldawood, Alkhalifah, Hoteit, Turkalli, Zuberi 2013, 2014).
  b. Efficient prestack imaging: we utilize the DSR operator for both modeling, but more importantly imaging using the concept of PERM. We also use prestack wavefields for velocity estimation. We recently extended the approach to anisotropic materials (Alkhalifah and Fomel 2010, 2011; Alkhalifah, Fomel and Wu, 2014; Wu and Alkhalifah 2013; Alkhalifah 2013; Wang and Alkhalifah 2014).
  c. Accurate amplitudes: Least squares migration as well as the excitation imaging condition provides tools for better amplitude representation (Aldawood, Hoteit, and Alkhalifah, 2011, 2012).