Assessment of the relationship of reservoir properties of hydrocarbon fields in the Lower Kura depression (Kursengi and Southern Kursengi areas)


Keywords: petrophysical characteristics, porosity, permeability, carbonate content, sandiness, reservoir, thickness

Abstract

The article is devoted to the analysis of the geological-petrophysical properties of the Kursengi and Southern Kursengi fields of the Lower Kura depression with a view to clarify the changes in the physical properties (carbonate content, permeability, porosity) of rocks with depth. Promising sediments and horizons of deposits are also considered based on a detailed analysis of numerous rock samples. Oil and gas bearing objects are especially distinguished by area, as well as possible oil and gas bearing blocks. The main purpose of these studies is to unravel changes in carbonate, porosity and permeability of rocks with depth based on core samples taken from drilled wells in the study area and to identify the factors causing these changes. To do this, using the obtained well data, the dependences of changes in depth of porosity, permeability and carbonate were compiled. As known, with increasing depth, rocks experience compaction. With the depth of changes in porosity, the rocks do not show any regularity, i. e. at some depths, an increase in the porosity of rocks is observed, and at some depths, a decrease, and this occurs in an abrupt manner. In our sections, the critical depths of porosity decrease are observed from 500 m to 1600 m, and the critical depth of porosity increase from 1600 m to 2950 m. In other words, the porosity of reservoirs, with a general gradual decrease in depth, begins to sharply decrease from a depth of 3200 m. In the study of core materials, it was found that the rocks are characterized by good reservoir properties. However, in many of the studied samples, the porosity of the rocks varies within a wide range of 12.8–27.8 %, and the permeability ranges from 0.001x10–15m2 to 120x10–15m2. Changes in petrophysical values are observed in both study areas. The reason for the change in petrophysical values in a wide range at the objects of study is associated with the lithological heterogeneity of the complexes and the occurrence depth of the reservoir.

Author Biographies

Shura A. Ganbarova
Azerbaijan State University of Oil and Industry, Azerbaijan Republic
Vagif M. Kerimov
Azerbaijan State University of Oil and Industry, Azerbaijan Republic

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Published
2022-08-02
How to Cite
Ganbarova, S., & Kerimov, V. (2022). Assessment of the relationship of reservoir properties of hydrocarbon fields in the Lower Kura depression (Kursengi and Southern Kursengi areas). Journal of Geology, Geography and Geoecology, 31(2), 223-232. https://doi.org/https://doi.org/10.15421/112221