Features of the temperature regime of the crust’s upper horizons in oil-and-gas bearing zones of the west of Ukraine

The paper analyzes the features of the temperature regime of the upper crustal horizons of the oil-and-gas bearing zones of western Ukraine based on the published and archival thermal logging data. It was established that the characteristic temperatures of rock horizons at depths of 1000, 2000, 3000, and 4000 m in the Forecarpathian region are 30±5, 50±10, 70±15, 90±20 °С, respectively. Average vertical temperature gradients here are characterized by values of 0.022±0.01 °С/m. In the Transcarpathian region, the characteristic temperatures of rock horizons at depths of 1000, 2000, and 3000 m are mostly within 55±10, 100±20, and 145±25 °С, respectively. Average vertical temperature gradients here are characterized 0.05±0.015 °С/m. The difference in deep temperatures between the Transcarpathians and the Forecarpathians is caused by the high deep heat flow in Transcarpathians induced by the influence of asthenolite from under Pannonia, while in Forecarpathians, which is tectonically mainly the southwestern edge of the East European Platform, the thermal regime is significantly calmer, typical for platforms. The findings will be compared with the features of the geodynamic regime of the corresponding zones and also used to establish and take into account temperature corrections to the petrophysical characteristics of the reservoir rocks for predicting the oil and gas capacity of well sections.