Energy Potential Analysis of Facially Heterogeneous Carbonate Reservoirs in the Process of Hydrocarbon Reserves Development

Author details
  • Perm National Research Polytechnic University, Perm, Russian Federation

Abstract

Analysis of the energy state of a deposit is an integral part of field development monitoring. Now, a significant volume of production in the Perm Krai comes from complex carbonate reservoirs, which are characterized by heterogeneity both vertically and laterally, different filtration and reservoir characteristics, alternation of different types of void space, and a large coefficient of compartmentalization. Under such conditions, the need for constant monitoring of the reservoir energy state, in particular the dynamics of reservoir pressure, increases. In this work, using the example of the T-Fm-Fr carbonate deposit of one oil field located in the Perm Krai in the northern part of the Solikamsk depression, an analysis of changes in reservoir pressure in various lithological-facial zones since the beginning of well commissioning was carried out. The four zones identified as a result of facies analysis are characteristic of fields confined to the reef reservoirs of the Solikamsk Depression and are characterized by different geological structures. It is generally accepted that the filtration and reservoir properties of a reservoir, field reserves and well flow rates can directly depend on lithological-facial zones. Thus, as a result of the study, it was established that the facies of the upper part of the rear plume of the reef was characterized by the maximum amount of accumulated fluid production and the best filtration and reservoir properties. However, based on the magnitude of changes in reservoir pressure in wells, obtained using artificial intelligence methods in the Data Stream Analytics program, and when calculating statistical criteria, it was established that the features of the facies environment did not significantly affect the magnitude of changes in reservoir pressure from the beginning of putting wells into operation. The calculated criteria confirmed the different amounts of accumulated oil and liquid production by facies and were not statistically significant for the magnitude of changes in reservoir pressure. The results of the study indicated the need to take into account all facial zones as a single development object when choosing the optimal system for maintaining reservoir pressure and selecting well stimulation.

Keywords

facies analysisreservoir pressure dynamicsstatistical analysiscomplex carbonate reservoirreef reservoirreservoir energy state.

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Article information

Published
28 June 2024
Issue date
28 June 2024
Issue
Vol. 24, No. 2 (2024)
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