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