Abstract: Depositional Environments of the Permo-Triassic Sediments from the Moesian Platform (Romania)

Constantin Pene

The analysis of lithostratigraphic and geophysics data suggest that during Permian-Lower Triassic and Upper Triassic at least in the northern part of the Moesian Platform has been developed a failed continental rift. This structogenetical evolution of the Moesian Platform has performed a continental environment during of the Permian-Lower Triassic and Upper Triassic as well as predominantly marine one during of the Middle Triassic.

The depositional model for the Permian-Lower Triassic and Upper Triassic consists of facies belts of fluviatile, aeolian, evaporite/lacustrine deposits roughly paralleling the main uplifts of the Moesian Platform. The facies belts pass from alluvial fan facies, best developed in proximity to the main uplifts, through fluviatile sands, dune and inter-dune aeolian sands and finally into evaporite/lacustrine facies at the center of the main depressions. The facies associations consist predominantly of the fining-up type sequences.

The marine environments for the Middle Triassic consist predominantly of carbonate facies.

The best reservoir types consists of conglomerate-, sand- and carbonate-dominated facies associations located at the bottom of Permian-Lower Triassic, Upper Triassic and Middle Triassic respectively. In the north-western part of the Moesian Platform there are twelve oil and gas fields stored into these reservoir types.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France