Abstract
A pilot project consisting of depth model building and depth migration was performed in 2018 for the Tengiz and Korolev fields onshore Kazakhstan. The pilot work focused on image improvement of a subset of the 2009 3D survey where joint FWI-Grid Based Tomography resulted in a high-resolution subsurface velocity model. The successfully completed pilot demonstrated uplifts to the image quality, especially within the target reservoir interval, and led to the planning and execution of the full-field re-processing project in 2019, with the unresolved residual fault shadows being a major target to be mitigated. Q-Tomography, Q-Migration, and Least-Square Migration were proved to be effective in the mitigation of the fault shadow issues, in addition to the overall imaging improvement on Tengiz and Korolev fields.
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