Depth structure of the Yalynsky thrust of the Dnieper—Donets Basin according to the seismic profile DOBREflection-2000

Gryn, DM
Dopov. Nac. akad. nauk Ukr. 2020, 2:45-51
https://doi.org/10.15407/dopovidi2020.02.045
Section: Geosciences
Language: Ukrainian
Abstract: 

The faults in the geological environment appear as a result of deep tectonic movements. Their number and spatial location is an important element of information about geodynamic phenomena that took place millions of years ago. The separation of faults from a seismic wave field is possible in a simple geology, when the reflecting boundaries are horizontal or have a small angle. Phase mismatches are at the point of fracture. This facilitates their identification. But, in most cases, we have a very complicated geology, or must explore the great depths. In such difficult cases, additional mathematical methods must be used to process seismic data. One such method is described in the article. It consists in the solution of the inverse dynamic seismic task. The purpose is to determine the absorbing characteristics of a geological structure. As a rule, faults in sedimentary rocks are filled with crushed rock, fluids, and water. This dramatically changes the absorbing properties of a fault and increases its contrast. The proposed method is based on the method of determining the logarithmic decay decrements. Seismic data of the CDP were used for the interpretation. They were made during the international project DOBREflection- 2000. The article presents the seismic profile section with the largest Yalynsky thrust in the DDB.

Keywords: absorption, fault, geotectonics, logarithmic decay decrements, seismic survey
References: 

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