Abstract
The Riono-Chernomorsk structural basin, which extends under the Black sea and part of western Georgia, is becoming increasingly important in oil and gas exploration. Tectonically, its western Georgia portion is divided into three regions: Guri, Abkhazsk-Megrel, and the Colchis lowland. A structure-contour map drawn on the surface of Upper Cretaceous sediments in the Colchis area revealed, generally, brachyanticlinal structures. These sediments, largely composed of carbonates as thick as 2,000 meters, occur throughout the Colchis area within drilling depth (1,000 to 3,000 meters). It is postulated that bitumen formation could have occurred in the sediments; however, processes of oil migration into the area are discussed. The character of Tertiary sediments in relation to regional-structural-stratigraphic control indicates that they are possible oil and gas reservoirs. --D.D. Fisher.
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