Least-Squares Migrations are well studied since few decades and are essentially known for their good properties in improving the signal-to-noise ratio, increasing the resolution and giving better and well-balanced amplitudes. Herein, the focus is done on Least-Square Reverse Time Migration for its ability to handle complex velocity fields with sharp velocity contrasts. In this paper we present an application of our regularized Least-Squares Reverse Time Migration to a subsalt imaging study using wide-azimuth seismic data. The operational objectives of this work are to improve the imaging of the target, to better understand the geometry of the structure and to reduce subsalt uncertainty related to reservoir extension so as to optimally position development wells. Numerical tests on this field will exhibit the potential of our current approach in producing images with better lateral continuities, improving signal-to-noise ratio and reducing migration artifacts. The impact of Least-Squares Reverse Time Migration on the amplitudes will also be debated.


Article metrics loading...

Loading full text...

Full text loading...


  1. Dai, W., and G.Schuster
    , 2013, Plane-wave least-squares reverse-time migration: Geophysics, 78, no. 4, S165–S177.
    [Google Scholar]
  2. Duquet, B., K. J.Marfurt, and J. A.Dellinger
    , 2000, Kirchhoff modeling, inversion for reflectivity, and subsurface illumination: Geophysics, 65, 1195–1209.
    [Google Scholar]
  3. Duprat, V. and R.Baina
    , 2016, An efficient least-squares reverse-time migration using true-amplitude imaging condition as an optimal preconditioner: 78th EAGE Conference and Exhibition.
    [Google Scholar]
  4. Dutta, G., M.Giboli, C.Agut, P.Williamson
    , 2016, Least-Squares Reverse Time Migration with Radon preconditioning, SEG Technical Program Expanded Abstracts 2016: 4198–4203.
    [Google Scholar]
  5. Giboli, M., R.Baina, L.Nicoletis, and B.Duquet
    , 2012, Reverse Time Migration surface offset gathers part 1: a new method to produce ‘classical’ common image gathers: 82nd Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  6. Schuster, G. T.
    , 1993, Least-squares cross-well migration: SEG Technical Program Expanded Abstracts, 12, 110–113.
    [Google Scholar]
  7. Wang, P., A.Gomes, Z.Zhang, and M.Wang
    , 2016, Least-squares RTM: Reality and possibilities for subsalt imaging. SEG Technical Program Expanded Abstracts 2016: pp. 4204–4209.
    [Google Scholar]
  8. Zhang, Y., L.Duan, and Y.Xie
    , 2013, A stable and practical implementation of least-squares reverse time migration: 83rd Annual International Meeting, SEG, Expanded Abstracs, 3716–3720.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error