E.Yu. Goryunov, V.A. Trofimov, A.E. Nesterova, E.I. Chesalova
Natural replenishment of oilfields reserves in the Volga-Urals Petroleum Province
On the basis of the produced oil amounts comparison for the fields of Volga-Urals Petroleum Province with the initial in-place and recoverable reserves, the fields are identified, where, according to the authors, current recharging by the deep hydrocarbon fluids and natural reserves recharge occurs. The weighty arguments in favour of this hypothesis are deep seismic data, regular location of these fields, and, most importantly, their confinement to the known faults. The other causes of the observed phenomena are also presented. The authors analysed data on oil properties available from the State Register of Reserves. As a result, the regularities of variations of oil density, content of sulphur, paraffin, resins and asphaltene components in it are revealed within the lithostratigraphic series and depth intervals. On the one hand, dependence of these parameters on depth of accumulation occurrence demonstrates the regular decrease of oil density, sulphur, resins and asphaltene components content with depth; and from the other hand, a wide range of values of these parameters. The reasons are given for the fact that such a variance may be caused by lateral inhomogeneity of their distribution. It is shown that regional variability of oil density, content of sulphur, paraffin, resins and asphaltene components in it are mainly governed by lateral zonality and do not depend much on the sequences age and composition. The revealed zonality retains in general its configuration at different depth levels, which is indicative of predominantly vertical fluid flow direction. Revealing and analysis of common factors are carried out on the basis of the compiled database and mathematical tools, which makes this result methodologically important. This provided greater reliability of the conclusions, the need to continue studies in Volga-Urals Petroleum Province, and also planning of similar works in the other regions.
Key words: current recharging and natural replenishment of oil field reserves; common factors of oil properties and temperature pattern variations.
For citation: Goryunov E.Yu., Trofimov V.A., Nesterova A.E., Chesalova E.I. Natural replenishment of oilfields reserves in the Volga-Urals Petroleum Province. Geologiya nefti i gaza = Oil and gas geology. 2019;(4):17–26. DOI: 10.31087/0016-7894-2019-4-17-26.
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Russian State Geological Prospecting University, Moscow, Russia;
JSC CGE, Moscow, Russia;
Lomonosov Moscow State University, Moscow, Russia;
Vernadsky State Geological Museum, Moscow, Russia;