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About characteristic features of naftides in connection with the process of formation of deposits

S.A. Punanova

Original article

DOI https://doi.org/10.18599/grs.2021.4.12

107-115
rus.
eng.

open access

Under a Creative Commons license
Studies have been carried out to assess the qualitative features of fluids, aimed at identifying the regularities in the differentiation of the properties of naphthides during the formation of hydrocarbon deposits outside anticlinal structures. Due to the exhaustion of hydrocarbon reserves associated with anticlinal traps, the main attention is paid to the composition of fluids confined specifically to non-anticlinal structures – to traps of a combined structure. Physicochemical properties, trace element (TE) composition, phase states of naphthides in deposits affected by hypergenetic or catagenetic processes have been analyzed using specific examples; in regions with a possible additional inflow of hydrocarbons (Romashkino group of fields in the Republic of Tatarstan); in the crystalline basement of sedimentary basins. The results of the analysis make it possible to predict the characteristic features of fluids in traps of various types at certain levels of the processes of oil formation, secondary transformation and destruction of accumulations, mainly due to the tectonic regime of the sedimentary basin. With prolonged lateral migration, at great depths with good isolation from surface weathering agents, light oils, depleted in TE, more often of nickel specialization, are found in lithologically and stratigraphically screened traps, and gas condensate accumulations are possible. At shallow depths with poor regional or local seals, heavy, highly viscous hypergene-transformed oils, natural bitumens with high concentrations of industrially significant metals V, Ni, Co, Mo Cd, U were found in traps of pinch-out zones and various types of trap screening. tectonically-screened traps) with a multiphase filling of traps and, at the same time, the influence and inflow of deep ones, i.e. more catagenically transformed fluids, it is possible to detect light oils of the nickel type or gas condensates enriched with elements of “magmatic emanations” – As, Hg, Al, B, rare earth elements. Oils filling combined traps in the crystalline basement within platform oil and gas basins, as a rule, do not differ in their compositional peculiarities in comparison with oils in overlying or adjacent parts of the sedimentary section.
 

combined traps, reservoir, tectonic regime, trace element composition of oil, forecast of oil composition, zones of hyperegenesis, catagenesis, basement

 

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Svetlana A. Punanova
Oil and Gas Research Institute of the Russian Academy of Sciences
3 Gubkin st., Moscow, 119333, Russian Federation
 

For citation:

Punanova S.A. (2021). About characteristic features of naftides in connection with the process of formation of deposits. Georesursy = Georesources, 23(4), pp. 107–115. DOI: https://doi.org/10.18599/grs.2021.4.12