Geochemistry and thermal maturation of Triassic to Eocene source rocks in the Central Taurus Belt, SW Turkey

Abstract

Triassic–Middle Eocene sedimentary sequences in the Central Taurids contain sufficient organic matter to constitute potential source rocks. Geochemical data are used to examine the amount, type and maturation of organic matter and the hydrocarbon potentials of the Triassic Tarasci Fm Limestone, the Late Jurassic–Early Cretaceous Akkuyu Fm limestones and shales and the Middle Eocene Gumusdamla Fm shales. During the extensive Senonian and Lutetian horizontal movements, sub-thrust units of these formations attained higher maturity values in the north (Seydisehir) than in the south (Akkuyu) of the study area. The TOC, S 2 , and HI values decrease with increasing thermal maturity (365–569°C). Therefore, the geochemical data indicate that the formations are gas and oil source rocks and may produce gas with some oil.

Organic Carbon and Trace Metal Distribution in the Gökçesu Shale: Eocene Basin, Bolu-Turkey

“…This type of deposits is formed in short geologic periods and associated with periods of distinctive organic carbon accumulation (Evstrahin, 1989;Degens and Ross, 1974;Nerucev, 1982;Mesejnikov et al, 1997;Sarı et al, 2001Sarı et al, , 2004.…”

Hydrocarbon Source Rock Assessments of the Late Jurassic Black Shales (Tokmar Formation) in the Central Taurus Region of Turkey

“…In the central Taurus region, CallovianOxfordian stages of Upper Jurassic organic matter-rich shales have been recognized with common Miliolina fossil contents by Oyal (1991). The first organic geochemical studies for the sedimentary sequences in the central Taurus region were carried out by Illeez et al (1994), Yurtsever et al (2000), and Sarı et al (2001).…”