Modern research in the field of oil and gas geology necessarily ends with the construction of a three-dimensional geological model, which is the basis for technological and financial decisions. If the problem of building models of local objects can be considered solved, the question of building regional geological models, which include a large number of local objects and unexplored territory between them, remains open. The subsystem of visualization of geoinformation system for construction and processing, first of all, of regional 2D - 3D geological models in the field of oil and gas geology and its functional filling, in particular visualization of structural and lithological sections, horizontal sections (maps), cubes by means of convenient and intuitive for geologist’s tools. The system was studied at the geological objects of the Donetsk-Dnieper basin (DDZ), information about which is in the database of geological and geophysical information (BDGGI) of SE Naukanaftogaz. Relevant software is created in a GIS environment using compilers such as Delphy and Fortran. Software tools for model visualization are demonstrated on the example of a structural model of oil and gas stratum at one of the sections of DDZ.Keywords: geoinformation system, 3-D visualization, computer graphics