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The Jurassic Organic Rich Carbonate Mudstones of the Tauride Belt (Turkey): Their Unconventional Oil and Gas Systems

Abstract

Rock sequences of the Taurus Mountains (Beydaglari and Akseki Platforms) include organic rich carbonate mudstones of the Jurassic age. The Upper Jurassic-Cretaceous Beydaglari Formation in the Beydaglari Platform includes units up to 140-600 meters thick of these lithofacies. TOC content of the carbonate mudstones range from 0.5 to 6.1% and the %Rocal values (0.42 to 1.19) determined for these rocks demonstrates that they have passed through an immature, oil and wet gas-condensate generation zone. Corrected Oil Saturation Index (OSIc.) of mudstones of the Beydaglari Formation range from 12.7 to 200.7 mgoil/gTOC indicates presence of potentially producible wet gas and condensate. The Late Jurassic Akkuyu Formation of the Akseki Platform is comprised of a 200 meter thick unit of organic rich carbonate mudstones. The Upper Jurassic Akkuyu Formation in the Akseki Platform comprises 200 meters of organic rich carbonate mudstones. TOC contents range from 3.8 to 19.2% and %Rocal values range from or 0.6 to 0.74. Thus, the Akkuyu Formation carbonates have passed through an early-middle mature oil generation zone. In-situ oil volume of the Akkuyu Formation has been calculated 7.9-45-7 mg oil/g TOC. 30 API for potential oils has been used. Thus %C15 minusloss are 22.33% and S1c are 1.28. The Akkuyu Formation has a hybrid oil system such as Bakken, Niobrara and Eagle Fort Formation with juxtaposed organic lean units and organic-rich source rocks. corrected Oil Saturation Index (OSIc.) of mudstones of the Akkuyu Formation shows that this formation has no potentially producible oil possibly because premier and secondary migration should be taken place. XRD whole rock analyses suggest that these carbonate mudstones are comprised of 85-100% calcite and dolomite, 0-5% quartz and 0-10% clay.