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The paper presents the results of anisotropy analysis of seismic data from a 3D project, aiming at mapping the Old Paleozoic formations in Northern Poland, with expected shale gas deposits. The geology of the area, together with 3D project parameters, have been discussed. Three types of migration Kirchoff PreSTM, Kirchoff PreSDM and CRAM (Common Reflection Angle Migration) were applied to the 3D data, being divided into six azimuthal sectors. For each of six migrated datasets, acoustic inversion has been carried out, resulting in inversion velocity volume. Those volumes have been analyzed via sinusoidal function fitting, which have yielded the most important anisotropy parameters (intensity and direction). The study results are presented and compared in a graphical way. It has been shown that for such an analysis, the application of depth migration (instead of time migration) can significantly improve the quality and reliability of the outcome.