Identification of projected zones of fractured reservoir development on the basis of revealing the fault-block structure of the Pre-Caspian

UDK: 550.814

DOI: 10.24887/0028-2448-2023-5-48-51

Key words: Pre-Caspian syneclise, Pre-Caspian, geological interpretation, lineaments, oil and gas potential, disjunctive dislocations, fractured reservoirs

Authors: L.V. Miloserdova (Gubkin University, RF, Moscow), A.V. Postnikov (Gubkin University, RF, Moscow), K.I. Dantsova (Gubkin University, RF, Moscow), E.A. Izmalkova (Gubkin University, RF, Moscow)

Lineaments, as visual objects that stand out on space images and reflect zones of reduced rock strength in the landscape, as well as the boundaries of tectonic blocks, have not yet been exhaustively studied despite many years of research. To identify and geometrize the zones of fractured reservoirs development in the pre-Mesozoic section, it is necessary to determine the areas of lineaments concentration. The study of lineaments is facilitated by the development of computer technologies for detecting and processing linear image elements. To decipher the lineaments, a mosaic of space images received from the Landsat-7 satellite was used. The "density of strokes" function in the LESSA program is used. Based on the deciphered lineaments, the program identified generalized extended lineaments.

Therefore, in order to allocate promising zones of fractured reservoirs development in the general system of the fracture field, it is necessary to map the zones of their maximum concentration

Zones of maximum concentration of fractured reservoirs have been identified, which are confined to inherited developing planetary systems, laid down in the period of lithification. On diagrams built using the LESSA program, they look like bundles of unidirectional lineaments.

Lineament thickening zones can be considered as promising objects for the development of fractured reservoirs and unconventional hydrocarbon deposits. Large zones of development of fractured reservoirs have been mapped. 101 objects have been identified that require more detailed research. In the central part of the study area, single, small-sized objects were identified. Most of the identified objects are confined to the west of the territory in the area of Zhangalinsky and Bokeyorda districts. The sizes of zones of development of fractured reservoirs do not exceed 1012 km. The identified zones of lineament thickening (nodes) can be considered as possible territories for the development of fractured reservoirs and, accordingly, the localization of unconventional hydrocarbon deposits.

References

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