--> Abstract: Basic Features of the Structure of the Bulgarian Offshore and some Aspects of its Hydrocarbon Potential, by P. Bokov, K. Guendovich, M. Radev, and P. Chakarov; #90990 (1993).

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BOKOV, P., K. GUENDOVICH, M. RADEV, and P. CHAKAROV, Geology and Geophysics Corporation, Sofia, Bulgaria

ABSTRACT: Basic Features of the Structure of the Bulgarian Offshore and some Aspects of its Hydrocarbon Potential

Most recent publications dealing with the structural configuration of the Bulgarian offshore area and its hydrocarbon potential focus on the offshore continuation of key structural elements recognized on land. However, newly acquired geological and geophysical information throws some light on this problem.

New tectonic elements are recognized that do not find equivalents onshore; these are characterized by their own oil and gas potential (e.g. Rezovska zone and Michurin saddle). In general terms, the Bulgarian Black Sea shelf can be subdivided into three structural units, which differ in their geohistorical development. (1) The northern platform part includes the Varna and east Moesian monoclines, which are separated by the Kaliakra fault zone. The area is characterized by block-faulted structures and a clearly expressed disconformity between Triassic and Upper Jurassic-Valanginian levels. (2) The southern borderland area, which comprises the eastern continuations of the Sredogorie, Balkan, and Strandza zones, is strongly differentiated and less well studied. The Balkan is characterized by flower structures and the Rezovska zone by diapir-like structures. (3) The continental slope is less well studied. Observed slope types vary between sedimentary constructional and tectonic erosional.

The hydrocarbon potential of the shelf is related to Devonian and Carboniferous as well as Upper Jurassic-Early Cretaceous carbonates. Organogenic buildups, particularly in the latter, are primary prospects. Tertiary prospects are related to Eocene sands and potential early Eocene and Oligocene source rocks.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.