O. Ozcelik, N. Unal S. Hokerek, M. Altunsoy
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Science and Technologies In Geology, Exploration and Mining, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-954-91818-7-6 / ISSN 1314-2704, June 16-22, 2013, Vol. 1, 141 - 148 pp


In the West Anatolia, at Şahinali (Aydın) region, the Miocene units consist of
conglomerate, coal, clayey coal, sandstone, siltstone, claystone, clayey limestone and
silicalimestone. Some 222 samples of coal and coaly units from the Miocene succession
were collected from 10 wells, in the westhern part of Turkey (Şahinali-Aydın). 37 core
samples were screened for total organic carbon (TOC) content. Selected samples were
than analyzed by Rock-Eval Pyrolysis. Visual kerogen analysis and vitrinite reflectance
measurements were also undertaken. Detailed data from coaly Miocene sediments made
it possible to construct an organic facies framework using different zonations. Organic
facies type B, C and CD were identified in the investigated units. The main composition
in the organic matter of the sediments are woody (76%), with minor portions of
amorphous (12%), planty (10%) and coaly (2%) in the investigation wells. Alteration
colors of these materials are yellow and dark yellow). Organic facies B is related to fine
grain detritics and carbonate lithofacies. This facies is characterized by average values
of HI around 556 (equivalent to Type II Kerogene), TOC around 7.41 %, and an
average of S2 of 41.19 mg HC/g of rock. This facies is laminated and well bedded, and
usually contains a higher persentage of terrestrial residual organic matter. The B facies
often is found in transgressive marine shale deposited in relatively shallow water, and it
is likely to be interbedded with less oil-prone facies because of fluctuations in bottomwater
anoxia. Organic facies C is related to sandstone, siltstone, claystone and coal
lithofacies. This facies is composed of organic matter with average values of HI around
172 (equivalent to Type II/III kerogene), TOC around 31.26 and S2 between 24.67 and
88.40 mg HC/g sample. Organic facies C is the “gas-prone” facies. The organic matter
is dominated by terrestrial debris in various stages of oxidization. Sediments of organic
facies C were commonly deposited on Tertiary and Mesozoic shelves and slopes of the
continantel margins. Most coals are organic facies C. The organic faces CD is related to
the sandstone, clayey sandstone, coaly sandstone, siltstone lithofacies. This facies is
characterized by average values of HI around 87 (equivalent to Type III kerogene),
TOC around 13.38%, and an average of S2 of 12.3 mg HC/g of rock. The CD facies
reflects a mixture of source materials including terrestrial plant detritus, reworked and
fine grained amorphous organic matter.

Keywords: Organic Facies, Miocene, coaly units, Aydın, Turkey

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