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  Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

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SOURCE ROCK POTENTIAL OF LOWER-MIDDLE MIOCENE LACUSTRINE DEPOSITS: EXAMPLE OF THE KÜÇÜKKUYU FORMATION, NW TURKEY; pp. 313–334

(Full article in PDF format) doi: 10.3176/oil.2015.4.03


Authors

AYŞE BOZCU

Abstract

The purpose of this study was to examine the geological, strati­graphic and organic geochemical features of the Küçükkuyu Formation out­cropping on Biga Peninsula, NW Turkey. The Lower-Middle Miocene forma­tion crops out around the Gulf of Edremit and near Bayramiç-Çan in the north of the Kazdağ Mountains. The unit is composed of shale, siltstone and sandstone intercalations. The shale is bituminous and represents a potential source rock in the region.
   Shale samples from the formation were investigated. Rock-Eval pyrolysis, vitrinite reflectance (Ro %), gas chromatography (GC), stable C isotope and total sulfur measurements were carried out. The shale is characterized by high total organic carbon (TOC) values (0.27 to 7.44 wt%, average 1.69 wt%), indicating a good potential source rock. The kerogen types are II and III, indicating the shale to be gas and oil-prone. Tmax values are between 352 and 453 °C, the average value suggesting early catagenesis. The pristane/ phytane (Pr/Ph) values reveal suboxic and anoxic environments. Carbon preference index (CPI) and C isotope values reveal terrestrial OM.
   Geological and stratigraphic evaluations and total sulfur (TS) figures indicate that the Küçükkuyu Formation was deposited in a suboxic-anoxic, freshwater environment (lacustrine), developing brackish water conditions from time to time.

Keywords

Küçükkuyu Formation, Miocene, bituminous shale, source rock, Biga Peninsula, NW Turkey.

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