Cgg Services Sas

Stephen Kefeng Xin

Min Wang

Yi Xie

Weiquan Xu

Computing device, computer instructions and method for determining an image of a surveyed subsurface. The method includes receiving recorded wave fields D recorded with seismic sensors over the subsurface; generating a series of modified recorded wave fields Dbased on the recorded wave fields D; iteratively applying an objective function Fto (1) one element Dof the series of modified recorded wave fields Dand (2) predicted wave fields P, where 'i' is an index associated with a given iteration; calculating with a computing device an updated velocity model mbased on a previous velocity model mand a step length; and producing the image of the subsurface based on the recorded wave fields D and the updated velocity model m. The predicted wave fields Pare predicted by the previous velocity model m.

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Kuala Lumpur, Malaysia

Stephen Kefeng Xin