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Abstract
Chapter from:
AAPG Memoir 68:Regional and Petroleum Geology of the Black Sea and
Surrounding Region, Edited by A.G. Robinson
AAPG Memoir 68: Regional and Petroleum Geology of the Black Sea and
Surrounding Region. Chapter 18: Petroleum Geology of the Georgian Fold and Thrust Belts and Foreland
Basins, by
Andrew
G. Robinson, Eric T. Griffith, Andrew R. Gardiner, and Andrew K. Home,
Pages 347-367
Copyright © 1997 by The American Association of Petroleum Geologists. All rights
reserved.Chapter 18
Petroleum Geology of the Georgian Fold and
Thrust Belts and Foreland Basins
Andrew G. Robinson
Eric T. Griffith
JKX Oil & Gas plc
Guildford, United Kingdom
Andrew R. Gardiner
Andrew K. Home
Robertson Research International
Llandudno, Gwynedd, United Kingdom
ABSTRACT
Numerous,
mainly small, oil discoveries have been made within the foreland basins and fold and
thrust belts of Georgia. The largest field in Georgia (Samgori) contained ~200 MMbbl
(million barrels) recoverable reserves reservoired in fractured middle Eocene
volcaniclastics--the main proven reservoir in Georgia--trapped in a compressional fold of
the Achara-Trialet belt. Where the Achara-Trialet deformation extended into the foreland
basins, frontal folds with Miocene-Pliocene clastic reservoirs are known to be oil-bearing
(e.g., Supsa field). Within the foreland basins in areas unaffected by Neogene
compression, structural closures related to pre-Neogene extensional faulting may include
draping lower Miocene and Mesozoic reservoirs: these are largely untested. The frontal
folds of the Greater Caucasus have yielded small oil discoveries in lower Miocene fluvial
to shallow marine clastic reservoirs. The widespread oil discoveries along the
Achara-Trialet frontal folds demonstrate the presence of a working oil sourcing system
from the Black Sea through to the Kura Basin. Gas chromatography-mass spectrometry and
carbon isotope analyses indicate that a single source rock was responsible for generation
of many of the oils in the foreland basins; oil source correlations suggest that this was
late Eocene in age, deposited within the Paleogene Achara-Trialet Basin. Further,
oil-prone source rocks appear to be present locally within the Greater Caucasus.
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