Rola tektonicznego i sedymentacyjnego czynnika w formowaniu złóż ropy i gazu zapadliska przedkarpackiego

Abstract

ROLE OF TECTONIC AND SEDIMENTARY FACTORS IN THE FORMATION OF OIL AND GAS DEPOSITS IN THE CARPATHIAN FOREDEEP

Summary

The analysis of the peculiarity in the distribution of lithologic sedimentary rock complexes that build up the Carpathian foredeep demonstrates that their sedimentation has been controlled not only by the nature of the subsidence of the basement in a direction from the Volhynia-Podolia plate towards the Carpathian geosynclines and by the palaeogeographic conditions, but also by the ancient depressions and elevations transverse to the Carpathians. The depressions were the first to have been covered with the marine transgressions, and the last to have been liberated from these transgressions. The transverse elevation, in turn, were the last to be invaded by the sea, and the first to be emerged from this sea. Such a situation considerably influenced the distribution of both thickness and lithology of the rocks. Among the transverse depressions of the Carpathian foredeep zone, which affected the sedimentary conditions of the deposits, are the following ones: Podborska, Dolińska, Nadwórniańska and Wierchowińska depressions, and within the outer zone: Krukienicka, Bolechowska, Otyńska and Kosowska depressions. To the transverse elevation that comprise both the inner and the outer zones of the foredeep belong: Starosolsko-Chodnowicka, Orów-Rozdolska, Majdan-Iwano-Frankowska, Mikuliczyn-Kołomyjska and Pokucko-Bukowińska elevations. The influence of the transverse zone tectonics upon the sedimentary conditions and upon the deposits has lasted throughout the whole geological history of the area under consideration, resulting in a peculiar distribution of crude oil and natural gas deposits.