Print this pageBasement Tectonics Versus Sedimentation and Their Importance for Petroleum System: Jurassic to Miocene Evolution of Southeastern Poland and Western Ukraine
Piotr Krzywiec1, Jacek Gutowski1, Igor
Popadyuk2, Piotr Gliniak3, Igor Gubych2,
Kazimierz Madej4, Irena Matyjasik5, Barbara
Olszewska6, Tatiana Syrota2, Andrzej Urbaniec3,
and Grzegorz Wróbel1
1 Polish Geological Institute, Warsaw, Poland
2 Ukrainian Geological Institute, Lviv, Ukraine
3 Polish Oil & Gas Company, Krakow, Poland
4 Polish Oil & Gas Company, Jaslo, Poland
5 Oil & Gas Institute, Krakow, Poland
6 Polish Geological Institute, Kraków, Poland
SE Poland and W Ukraine formed in Mesozoic times transitional area between the Peri-Tethyan (epicontinental) and Tethyan (oceanic) domain. Its evolution was significantly controlled by the Tornquist–Teisseyre Zone - crustal boundary between the Precambrian and the Palaeozoic Europe. During Jurassic to Early Cretaceous subsidence siliciclastic and carbonate sediments were formed, including Oxfordian-Beriassian carbonate organic buildups (sponge-microbial bioherms and coral reefs) which form hydrocarbon reservoirs. Their development was controlled by syn-depositional basement faulting. Tithonian - Beriassian pelagic black bituminous shales deposited in front of the bioherm-reef belt form excellent source rock. Late Cretaceous inversion resulted in reverse transpressional reactivation of main basement fault zones. Syn-inversion sediments were deposited in open marine shelf environment with general direction of sediment supply away from inverted axial part of the basin. Within the Santonian - Campanian siliclastic deposits, large-scale submarine slides related to inversion-triggered slope destabilization developed. Integration of seismic and well data allowed for dating the beginning of tectonic inversion as Late(?) Turonian with its peak during Campanian – Maastrichtian and post-Maastrichtian times. Upper Cretaceous marls provide seal for the Jurassic reservoirs. As a result of the Miocene thrusting within the Carpathians, epicontinental Mesozoic basin of SE Poland and W Ukraine, has been covered by the Miocene sediments of the Carpathian foredeep and/or by the Carpathian nappes. During thrusting-related flexural extension basement fault zones have been again reactivated in transtensional regime, which enhanced HC prospectivity of selected areas due to juxtaposition of source and reservoir rocks. Miocene foredeep evaporites provide additional very effective seal.
AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005