High precision velocity modeling technology for depth migration based on post stack inversion
Permian igneous rocks are widely developed in Shunbei exploration area of Tarim Basin.The velocity change caused by igneous rocks seriously restricts the imaging of underlying strata.The accuracy of igneous rock velocity is of great significance for improving the imaging of underlying strata.To this end,an analysis was conducted on the physical and seismic response characteristics of the Permian igneous rock logging data,and it was found that the velocity field can well reflect the sedimentary trend of the igneous rock.A high-precision initial velocity model was constructed based on the velocity field constraint modeling method,and the spatial distribution characteristics of the igneous rock velocity volume were clarified through post stack inversion.The igneous rock velocity volume was applied to deep migration velocity modeling,Better solution to the problem of inability to accurately describe igneous rock velocity bodies due to limited logging data,improving the accuracy of depth migration velocity models,and accurately constructing depth migration imaging structures.
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