Journal of Petroleum Geology, Vol.4,
No.1, pp. 57-75, 1981
©Copyright 2000 Scientific Press,
Ltd.
AN OIL MIGRATION AND
RE-ENTRAPMENT MODEL FOR THE MARDIN GROUP RESERVOIRS OF SOUTHEAST
ANATOLIA
L. Tufan Erdogan and Azat Akgül*
*Turkish Petroleum Corporation,
Exploration Department, TPAO Arama Grubu, Müdafaa Cad. 22,
Bakanliklar-Ankara/ Turkey.
Abstract
Oil migrates from a source into a reservoir
rock and then, inside the reservoir rock, into a trap, and from
the trap into a series of traps and reservoir rocks. The movement
of oil is continuous and the interchange of oil between several
reservoir rocks is totally independent of the source rock after a
certain stage of migration. Each migration stage may cause
quality changes in the properties of oil. A model is devised to
account for oil migration and re-entrapment, and to explain the
distribution of different quality oils in time and space.
Variations in the API-gravity of oil, formation-water salinity,
reservoir temperature and pressure, sulphur-content of oil,
initial water content and recoverable oil reserves of oilfields
can be important clues for the determination of migration
directions and new prospects. These concepts were applied in a
petroleum migration study of the Mardin Group (Aptian-Turonian)
which is the most important reservoir rock of SE Anatolia.
