The Permian formation has developed giant thick salt domes in the Block M, Pre-Caspian basin. Because of
the huge velocity difference between the salt domes and surrounding rocks, the sub-salt seismic events are
pulled up in time sections and displays structure artifacts, which brings difficulty in well deployment. Based
on analyzing the characteristics of the velocity and the difficulties in the variable-velocity mapping of
saliferous basins, we firstly edited the anomalies in seismic stack velocity spectrum, then calculated the
layer velocity through coherent inversion and optimized the velocity field combined with logging data.
Finally, we carried out time-depth conversion and structure mapping by using map migration method. By
using the above workflow, the structure map of Block M was obtained, and the impact of salt-dome velocity
was removed, which displays the actual shape of sub-salt structure.
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