Akademik Veri Yönetim Sistemi
Journal of Petroleum Science and Engineering, cilt.65, sa.1-2, ss.33-44, 2009 (SCI-Expanded, Scopus)
This paper reports microfacies, diagenesis and reservoir properties of the Lower-Middle Miocene Karaisali{dotless} Formation in the Adana Basin, southern Turkey. The Karaisali{dotless} Formation reflects the continuous deposition of shallow-shelf carbonates; periodic rises in sea level led to episodes of deeper water sedimentation. The formation was studied using outcrop samples from the Karaisali{dotless} region. Karaisali{dotless} Formation carbonates are up to 500 m thick. Abundant bioclasts include corals, red algae, bryozoans and benthonic and planktonic foraminifera. The best reservoir conditions in the Karaisali{dotless} Formation occur in grain-supported facies such as Foraminiferal-Algal packstones. Secondary vuggy and moldic porosity, which are common in the Foraminiferal/Algal Packstones, resulted from micritic cement and the dissolution of skeletal grains during early diagenesis. Foraminiferal/Algal Packstones are characterised by porosities of > 20% and by permeabilities between 7 mD and 18 mD. Other carbonate facies, such as planktonic wackestones and coralgal boundstones have poorer reservoir characteristics. Most pore throats (50% or more) range between 1 and 2 μm, and only a small percentage of pore throats are less than 1 μ. These results indicate that the Karaisali{dotless} limestones have intermediate - good reservoir characteristics. The carbonates were affected by a range of diagenetic processes, including grain dissolution which led to the formation of secondary porosity reduced by calcite cementation. The wackestone and boundstone facies of the Karaisali{dotless} limestones are not suitable targets for hydrocarbon exploration in the Adana Basin. However, the Foraminiferal/Algal packestone facies may have a higher exploration success. © 2009 Elsevier B.V. All rights reserved.