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THE GEOLOGICAL STRUCTURE AND UNCONVENTIONAL HYDROCARBON POTENTIAL OF THE POLISH OUTER CARPATHIANS
Abstract
The West Carpathians consist of an older, internal orogenic zone known as the Inner or Central Carpathians and the external, younger one, known as the Outer or Flysch Carpathians. The Outer Carpathians are built up of a stack of nappes and thrust-sheets showing a different lithostratigraphy and tectonic structures. The Outer Carpathian nappes are thrust over the North European Platform and its Miocene-Paleocene cover. They correspond to more or less separate sedimentary basins and every basin generally displays a different lithostratigraphic development. The Outer Carpathian rocks represent a time span between the Late Jurassic and the Early Miocene. During the overthrusting movements the tectonic units became uprooted and generally only the central parts of the basins are preserved. The following Outer Carpathian nappes have been distinguished: Magura Nappe, Fore-Magura group of nappes, Silesian, Subsilesian and Skole nappes. The Silesian, Subsilesia and Skole nappes contain organic-rich rocks. These rocks were deposited during the favorable conditions for organic-richness. The older rocks we deposited during Early Cretaceous, the younger during Oligocene times. Parts of the anoxic shales have been hidden at the depth of few thousand meters during the folding and overthrusting movements. They can represent unconventional resources known as shale-gas and shale-oil.
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References11
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