Abstract: Onshore South Caspian basin oil fields in Western Turkmenistan. The Keimir Joint Venture as an example
TORRES, MAX A
Keimir, Akpatlauk
and Chikishlyar oil and gas fields are located in the Joint Venture's acreage
in the Gograndag-Okarem petroliferous province. Late Pliocene, major northeastward
activity in the Kopet Dagh-Alborz thrust belts resulted in a series of
parallel structural ridges, where the accumulations were trapped by four-way
dip anticlines. Productive interval is a Middle Pliocene, aggradational
to progradational, 1200 meters-thick section in the paleo-Amu Darya deltaic
wedge, known as Upper and Lower Red Colour Formations. Main producing reservoirs
were interpreted as having been deposited in shallow marine and lower delta
plain to braided channels environments in lowstand and transgressive systems
tracts
. The reservoirs are laterally extensive, cyclic, stacked, overpressured
fine-grained lithic arkosic sandstones with thicknesses that range from
2 to 15 meters. Intergranular effective porosity vary from 16 to 24%, permeabilities
from 50 to 1,000 mD, and overpressures range from 10.5 to 16.5 ppg. A detailed
reprocessed seismic interpretation revealed important reservoir compartmentalization
as the result of transcurrent and extensional faulting in the folded cover.
Each reservoir presents an independent fluid contact and predominant drive
mechanism is water drive. Wells produce an average of 300 bopd with GOR's
that range from 600 to 5500 bbls/cfg in undersaturated and saturated
systems
,
respectively. Oil is sweet, with 15 to 34 degrees API, and paraffinic (13-20%).
The interpretation of the Bkz log suite improved considerably the
identification
of pay and oil vs. gas zones.
AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria