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Abstract
In the work presented here, core and cutting samples from a single well were studied with the aim of understanding the diagenesis and reservoir properties of the Kömürlü and Penek Formation sandstones in the Aşkale sub-basin in East Anatolia. Based on petrological and hydrocarbon saturation analyses [attenuated total reflectance-Fourier-transform infrared spectroscopy] of the samples, we discuss the relationships between diagenetic alterations and reservoir quality. The diagenetic alterations include quartz, feldspar overgrowth, calcite, smectite, chlorite, mixed-layer illite–smectite, mixed-layer chlorite–smectite, illite, kaolinite, and pyrite. After the diagenetic mineral phases formed, secondary porosity formed via dissolution of late carbonate cement in these sandstones. Diagenesis in the Kömürlü and Penek Formation sandstones commonly destroyed much of the original intergranular porosity, dissolved grains, and produced clay-filled pores. The pore throats typically range in size from 1 to 5 µm and represent only a small portion of the total porosity. This study is the first attempt to make petrophysical data available from the well logs of the reservoir sandstones (Kömürlü and Penek Formations) in the Aşkale sub-basin of the East Anatolia Basin. The results of this study will clarify the characterization of the reservoir sandstones.
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