Structural features, oil and gas bearing of the Nizhnekurinskaya basin

V. M. Seidov, L. N. Khalilova

V. M. Seidov, L. N. Khalilova / News of the Ural State Mining University 3 (2018) 40-46

Relevance. Famously, tectonic fissures are formed at different stages of the formation of structures. In most cases, the time of their generation coincides with the final stages of folding, when the possibilities of plastic deformation of beds are almost exhausted. However, in the regions of the distribution of discontinuous folds of the geosynclinal type, fissures can occur much earlier and develop simultaneously with the growth of structures in the process of sedimentation. Such fissures can be a hindrance to the movement of fluid and gas through the formation while lateral migration, causing uneven saturation of hydrocarbon structures by traps. Later, these violations, with a certain combination of environmental conditions, acquire the necessary conductivity facilitating the flow of fluid and gas from one formation to another. Therefore, the study of the relationship between the development of structures and the development of fissures along with their growth, using the example of separate oil and gas bearing regions, has not only theoretical but important practical significance as well. Such areas include the Nizhnekurinskaya basin made by thick strata (up to 6–7 km) of Pliocene-Anthropogene deposits, on the territory of which deposits of Kyurovdag, Mishovdag, Galmaz, Garabagly, Kyursangya and others have been discovered for the last 10–12 years. Currently, new oil and gas deposits are being searched within the known deposits and in some promising areas. Supposedly, fissures within the separate uplifts of the Nizhnekurinskaya basin are formed at the final stage of the formation of its folded structure. However, the drilling data accumulated over the past decade do not agree with this view and require its revision for some structures of the Nizhnekurinskaya oil and gas bearing region.
Purpose. Study of some structures of the Nizhnekurinskaya oil and gas bearing region and fissures formed within these structures in the light of new geophysical data.
Task: clarification of time of formation of fissures within the structures of the Nizhnekurinskaya oil and gas bearing area according to drilling data and geophysical exploration in wells.
Research subject: deposits of stratigraphic units of the Upper Pliocene.
Object of research: Galmazskoe, Dashgilskoe, Garabaglinskoe and Kyursanginskoe uplifts.
Results. As a result of the conducted studies, the authors came to the conclusion that there are syn-depositional folds in the Nizhnekurinskaya basin along with post-infolded fissures.

Keywords: Nizhnekurinskaya basin, anticline, productive strata, syndepositionality, fissure.

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