25th International Meeting on Organic Geochemistry IMOG 2011

P-122
Organic geochemical characterizations of organic-rich rocks of
Beydili (Ankara, Turkey)
Derya Koca, Ali Sarı
Ankara University, Faculty of Engineering, Department of Geological Engineering, Ankara, Turkey
(corresponding author:derya.koca@gmail.com)
The investigated area which is located between
Sarıcakaya (Eskişehir) and Nallıhan (Ankara)
occurres in the valley of Sakarya river that flows from
east to west. The investigated area consists of
Paleozoic, Mesozoic and Cenozoic sedimentary and
volcanic units. Samples investigated in this work are
composed from Paleocene-Eocene organic-rich black
shales of Çamalan Formation. This work is aimed at
investigating the organic geochemistry characteristic
and determining the source rock potential of Beydili
organic-rich black shales.
For achieve the goal, several organic geochemical
analysis were applied to 26 black shale samples
collected from the investigated area. Organic carbon
values of samples range between 1.35 – 11.2 % wt.
(with an average of 5.78) however they show goodexcellent
source rock potential.
Organic material types of samples were
determined by pyrolysis (Rock-Eval-6) and organic
petrographic analysis. Obtained datas show that they
have amorphous and algal organic material type. The
average of Hydrogen Index (HI) values are 670 mg
HC/g Corg, 2 samples show Type II kerogen, while 24
samples are Type I kerogen. Furthermore average of
Tmax of samples are 441°C, therefore samples
indicate immature-early mature stage. Maturation was
determined also with Production Index (OI) and Spor
Color Index (SCI) parameters. PI and SCI values
indicate immature stage, respectively between 0,1 and
0.21 and 3.0-4.0.
According to S1 (0.08 – 0.97 mg HC/g Rock) and
S2 (4.96 – 81.59 mg HC/g Rock) hydrocarbon values,
samples show that range from weak to excellent oil
potential. Pr/Ph values obtained by Gas
Chromatography analysis (GC) show that BD15,
BD27 and BD56 samples are > 1.0 that which indicate
oxic depositional environment and terrestrial organic
material; for the BD3 and BD34 samples Pr/Ph values
are < 1.0 which indicate anoxic depositional
environment and marine organic material.
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