Basement 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