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LITHOLOGICAL AND THERMAL FEATURES OF MITROVO FORMATION (T2-3) IN CENTRAL SOUTHERN PART OF THE MOESIAN PLATFORM (BULGARIA): PRECONDITIONS FOR A HYDROCARBON GENERATION
Abstract
The Triassic sediments in the Moesian Platform are very well explored. The study area is in the Bulgarian territory and covers ce ntral part of the South Moesian Platform Margin and adjoining zone to the north. The Triassic rocks there are characterized by considerable diversity, thickness and burial depths. Among them Mitrovo Fm. (T 2lad- T3crn) contains mostly silty-argillacious car bonates with a fair to good organic matter content. The Pre-Jurassic erosion reached different le vels up to Middle Triassic, Lower Triassic and even Paleozoic rocks. Therefore, the denudation partly or completely cut down the sediments of Mitrovo Fm. in central and eastern part of the study area. The reduced thicknesses vary from few ten meters to 130 m. Maturity indices demonstrate that the Mitrovo Fm. sediment s are Late- to Postmature. The highest values are measured in the border area of the South Moesian Platform Margin and Forebalkan. Thermal history r econstructions based on constant scenarios show relatively smooth distribution of the heat flow in the range of 50-55 mW/m 2. The final goals of the paper are to investigate and analyze the lithology and thermal features of Mitrovo Fm. as important preconditions for a hydrocarbon generation. The main focus is on a narrow dist ribution, lithological heterogeneity and higher maturity of the sediments as hydrocarbon generation limitations.
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References16
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