Anisotropic velocity-depth modelling adjusted on the well data to perform depth migration and interpretation based on the survey at the one of the Eastern Siberia oil fields

Authors: A.S. Sorokin (Gazpromneft NTC LLC, RF, Saint-Petersburg), E.V. Lyubimov (Gazprom Neft PJSC, RF, Saint-Petersburg), P.V. Didenko (Gazpromneft-Angara LLC, RF, Saint-Petersburg), A.N. Inozemtsev (Paradigm Geophysical LLC, RF, Moscow)

Key words: land seismic, migration transformation, deep-velocity model, layer coherent inversion method, Thomsen anisotropic parameters, tomography

The depth migration is widely used for seismic data processing obtained in regions with complicated geological structure. The base for successful migration is a high quality deep-velocity model (DVM) that provides a high quality image and a good correlation between seismic horizons and well picks. For the complex geological features it is commonly used two kinds of modelling: the one is for the image focusing, the other - to adjust seismic by the well data. The method of anisotropic DVM applying in this paper, allows to create the model that simultaneously provides a good flattening of reflected waves on the gathers and a high correlation with the well data. It in turn provides an opportunity to perform the interpretation not only qualitatively but also on a quantitative level