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Shale Oil Assessment of the Jurassic- Cretaceous Formations of the Taurus and Northern Arabian Platform, South Turkey

Abstract

The Taurus and Arabian Platform in south Turkey contain the Jurassic-Cretaceous organic matter rich formations which are deposited in the Neotethys Ocean. The Upper Jurassic Akkuyu Formation in the Anamas-Akseki Autochthonous of the center Taurus consists of 200 meters thick organic matter rich carbonates. The formation has excellent source rock potential because TOC contents are ranging from 3.81 to 19.20%. HI indexes are changing from 575 to 756. The formation is represented by early-middle mature oil generation zone because Tmax values are ranging from 431 to 439 oC. XRD whole rock data analyses suggest that the formation has 85–100% calcite, 0–5% quartz and 0–10% clay. The Upper Cretaceous Derekoy Formation of the Antalya Nappes in the western Taurus consists of 350 meters thick radiolarite, chert, limestone and black shale alternations. The black shale ratio is less than 10%. The formation has excellent source rock potential because TOC contents are ranging from 19 to 37%. However, the formation is immature according to 419 −425 oC Tmax values. XRD whole rock data analyses suggest that the Derekoy Formation has 26–80% quartz, 11–41% clay and 0–40% pyrite. The Cretaceous Karababa (lower section) and Karabogaz Formations in the Arabian Platform which produces oil in Adiyaman region contain 30 and 60 meters thick organic matter rich carbonates, respectively. The formations have fair-excellent source rock potential because TOC contents are ranging from 0.50 to 6.0%. HI indexes are changing from 336 to 661. Tmax values are ranging from 429 to 449 oC. Thus, the formations are represented by early and middle mature oil generation zone. The formations have 77–94% calcite 3–20% quartz, 0–20% clay according to XRD whole rock data analyses. The organic geochemical and mineralogical data presented above indicate that the Upper Jurassic Akkuyu Formation in the Taurus and Upper Cretaceous Karababa (lower section) and Karabogaz Formations in the Arabian Platform have shale oil potential.