Akademik Veri Yönetim Sistemi
13th International Multidisciplinary Scientific Geoconference, SGEM 2013, Albena, Bulgaristan, 16 - 22 Haziran 2013, ss.141-148
In the West Anatolia, at Sahinali (Aydin) 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 (Sahinali-Aydin). 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 bottom-water 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 Ill 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.