Forecast of hydrocarbon system parameters of the internal zone of the Precarpathian treatenant
DOI:
https://doi.org/10.31471/1993-9868-2025-2(44)-24-36Keywords:
Hydrocarbon systems, thermobaric conditions, oil content, anomaly coefficient, gas-filled.Abstract
A regional forecast of formation hydrocarbon systems for the gas fields of the Inner Zone of the Pre-Carpathian Depression has been produced. The company has conditionally allocated six areas, within which the individual fields and their structural blocks are located. The distribution of different types of hydrocarbon system has been modelled, enabling prediction at great depths in regions of high temperature and pressure in the initial stages of exploration. The peculiarity of establishing the forecast indicators lies in the fact that the thermobaric and physical parameters of the reservoir and reservoir oil are considered as combined average values within a single, integral Inner Tectonic Zone. Changes to each of these parameters were uniform and extended over the entire zone. The depths of fluid replacement were estimated by extrapolating the averaged G = f (H) curves. However, when such universal curves are used in practice, the reliability of finding the values of specific parameters is reduced to a certain extent. This is insufficient for the current stage of the fundamental study of the oil and gas potential of the Carpathian region. High reservoir temperatures only increase the intensity of the fluid separation process. Consequently, the recovery of conventional oils from deposits remains low and is very low in cases involving the development of transitional oils. Additionally, the issue of reservoir structure strength is important and currently poorly understood. When developing oil deposits in any mode (elastic or dissolved gas), reservoir pressure inevitably decreases. Graphs were built and the regression equations for the forecast parameters were derived. These are included in the formula for calculating hydrocarbon reserves by the volumetric method relative to the depths of the deposits. The regression equations for prediction in combination with laboratory studies of thermobaric conditions (pressure and temperature) with depth was derived, because information about them is needed to calculate individual parameters of hydrocarbon systems.
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