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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


DOI: 10.1306/05141917201

Impact of maturity on producible shale oil volumes in the Silurian (Llandovery) hot shales of the northern Arabian plate, southeastern Turkey

Şamİl Şen,1 and Hüseyİn Kozlu2

1Department of Geology, Istanbul University-Cerrahpaşa, Avcilar, Istanbul, Turkey; SHALESYS Inc., Istanbul Technopolis, Avcılar, Istanbul, Turkey; [email protected], [email protected]
2Retired, Exploration Group, Turkish Petroleum, Ankara, Turkey; [email protected]


The Silurian (Llandovery) hot shales in southeastern Turkey have excellent source rock potential, with an average total organic carbon (TOC) of 5.9 wt. % and generation potential values of 14.9 mg HC/g TOC. The hot shales contain type II organic matter and demonstrate oil and secondary gas generation potential. Hydrogen indices range from 36 to 510 mg HC/g TOC, depending on maturity. The hot shales in the Gulf Kevan 1 and Turkish Petroleum (TP) Doğan 1 wells are immature–early mature with a vitrinite reflectance equivalent (Requ) of 0.58%–0.76%. The hot shales in the TP Soğuktepe 1 and TP K. Migo 2 wells are mature and in the oil window at 0.78%–0.92% Requ. The hot shales are interpreted to be in the wet gas–condensate maturity window with 1.08%–1.30% Requ in the TP G. Hazro 2 and TP-Arco Abdülaziz 1 wells. Corrected (evaporation loss restored using oil API gravity values) oil saturation index values (OSIc) within the Gulf Kevan 1, TP Doğan 1, and TP-Arco Abdülaziz 1 wells are less than 100 mg HC/g TOC, which indicates that unconventional commercial oil production is not probable. The OSIc values of the mature hot shales at the TP Soğuktepe 1, TP K. Migo 2, and TP G. Hazro 2 wells all exceed 100 mg HC/g TOC, indicating potentially producible oil and wet gas condensate. Thus, producible oil and wet gas condensate in the hot shale play appear present in areas that have been assessed as having between 0.8% and 1.1% Requ.

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