Methodological aspects of the different-level tectonic modeling

UDK: 550.8.072
DOI: 10.24887/0028-2448-2018-5-14-17
Key words: tectonics, structural-dynamic model of oil field, Influence Cycle, Verification Cycle, dominant tectonic movement
Authors: V.V. Volyanskaya (Rosneft Oil Company, RF, Moscow)

The article describes the scheme of the Influence and Verification cycles, which demonstrates the importance of 4D tectonic modeling. Also, the term of the “structural-dynamic field model” is proposed. The critical parameters are defined for paleotectonic modeling, including tectonic activation period and dominant tectonic movement. In case of tectonic modeling there are two issues. Theoretically, the way of study has to go from a global level, based on convection mantle flaw, via regional and area level to the local one. The local level is usually presented as a static model of an oil field. This is the Influence Cycle because the global crust movements control the big (regional) faults, the regional faults form the area structures and middle size faults, and the process of structure forming creates the local faults and zone of natural fractures. In this case, a typical static oil field model does not present paleo tectonics processes. To solve this methodological problem, the best way is to build the structural-dynamic oil field model which includes paleo tectonic reconstructions. The structural-dynamic model is a conceptual view on the geological body geometry, geometry changes and movements during some period of geological time. The structural-dynamic model is the start point for Verification Cycle when the systematization of oil field data verifies the area or regional tectonic concepts.

Also the understanding of area tectonic concept is very important because it is 4D paleo tectonic reconstructions based on real data from several oil fields covering the territory with similar geological history and illustrates the periods of tectonic activities in the area under investigation. The idea of dominant tectonic movement is a key for studying the paleo stresses. For practical issues, the best way is to use the three main movements: lateral (plate tectonic), vertical (asthenosphere isostatic) and rotation (small plate borders by subduction, collision or spreading in the same geological time). The complicated part of this study is the identification of tectonic activity periods, the dominant movements for each period and the degree of influence from the secondary type of movements.


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