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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 19: Stratigraphic and Structural Development of the Gulf of
Odessa, Ukrainian Black Sea: Implications for Petroleum Exploration, by
Andrew
G. Robinson and Edward Kerusov,
Pages 369-380
Copyright © 1997 by The American Association of Petroleum Geologists. All rights
reserved.Chapter 19
Stratigraphic and Structural Development of the Gulf of
Odessa, Ukrainian Black Sea: Implications for Petroleum Exploration
Andrew G. Robinson
JKX Oil & Gasplc
Guildford, Surrey, United Kingdom
Edward Kerusov
Chernomorneftegas
Simferopol, Ukraine
ABSTRACT
The Gulf of Odessa forms the northern rift and passive margin of
the extensional Western Black Sea. The prerift comprises the Scythian Proterozoic to
Triassic platform in the north (which dips gently southward) and, in the south, a
Triassic-Early Jurassic back-arc basin that closed during the Middle Jurassic (Tavric-Kure
Series). Both of these units were covered by a Late Jurassic carbonate platform prior to
the Aptian-Albian doming and rifting that preceded the opening of the Western Black Sea
(Cenomanian). During the late Eocene to Oligocene, Aptian-Albian half-grabens suffered
limited inversion related to closure of the Tethyan Ocean in Central Anatolia. The main
play in the Gulf of Odessa has involved Lower Paleocene chalk in inversion-related
anticlines formed during the late Eocene to Oligocene. The chalks are not significantly
fractured, and permeabilities are of the order of a few millidarcys. The source rock for
the wet gas has not been positively identified, but may be Paleozoic, possibly Devonian,
or Albian in age. Extensional structures that formed prior to inversion may still contain
the early oil charge from such a source. Adjacent to the deep Black Sea Basin, there is an
east-west-trending extensional high (Kalamit Ridge) that extends into Romania and includes
the Lebada oil field. The Lebada play, transgressional Albian sandstones draped over
partly inverted extensional fault blocks and charged by a Tertiary (Upper Eocene?) source
rock in the deep Black Sea Basin, extends into Ukrainian waters.
End page 369 ----------------
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