Мінеральні ресурси України (May 2022)
Uplifts under-thrust in the carpathians region and their prospects for oil and gas potential
Abstract
The article discusses the prospects of oil and gas in the Paleozoic, Mesozoic and Neogene sediments in under thrust uplifts in the outer zone of Precarpathian trough, within the Carpathian graben and southwest of the graben, that is, within Folded Carpathians. It is assumed that most of these uplifts are composed of Mesozoic terrigenous-carbonate rocks, partly Neogene and Paleogene non-flysch rocks, which have reservoir properties, and are overlain by Neogene molasses and a thrust complex of flysch rocks. In the conditions of the Carpathian Orogen, seismic prospecting is not always possible to determine the location of the dome of the structures due to insufficient traceability of the reflection horizons. Search drilling is often unsuccessful. Therefore, the development of new inexpensive additional methods for forecasting oil and gas promising uplifts is relevant. A technique for interpreting geological and gravimetric materials is presented. These uplifts are identified as a result of the analysis of geological and geophysical materials, in particular geologic-tectonic maps, drilling data, gravity anomaly maps and geologic-gravimetric modeling data along profiles that, as a rule, cross the vault of uplifts. Geological-gravimetric modeling is based on solving of the gravity inversion. The geological and tectonic characteristics of promising areas are illustrated by structural maps and geo-density cross-sections, which were built by the authors. Geo-density models of geological cross-sections are consistent with gravity anomalies. The number of detected uplifts is more than 50. A number of uplifts, except for those under the Carpathian bed, are located at relatively shallow depths, more accessible for drilling. The location of prospecting boreholes is recommended.
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