AAPG ANNUAL CONFERENCE AND EXHIBITION
Making the Next Giant Leap in Geosciences
April 10-13, 2011, Houston, Texas, USA
Petroleum Source Rock Assessment of the Middle Oligosen-Lower Miocene Coal Bearing Deltaic Sediments in the NW Turkey
(1) Istanbul University, Istanbul, Turkey.
The oil and gas-bearing Thrace Basin (NW Turkey) contains Late Cretaceous to Recent sediments. Middle Oligocene-Lower Miocene deltaic sediments of the Osmancik and Danisment Formations in the NW Turkey comprise organic matter rich shale and coal. Bacteriogenic gases in the Silivri, Hayrabolu, Turgutbey, Umurca, Tekirdag, and Karacali fields in the basin were generated from the Danisment Formation and the upper part of the Osmancik Formation.
This study focuses on petroleum source rock assessment of the coal bearing deltaic sediments based on Rock-Eval - TOC data and organic petrographic analysis of the 51 fresh surface samples taken from Malkara, Kumbag-Tekirdag, Marmara Ereglisi, Akpinar and Sile regions. According to this data, shale and coal have very good source rock potential due to its TOC (total organic carbon) content ranging from 0.02 to 45.53%. T-max (pyrolysis temperature at the maximum rate of kerogen conversion) values have been measured between 351 and 449 °C. Thus, the sediments are ranging from immature (only biogenic gas) to middle mature. In addition, organic petrographic investigations in this study suggest that organic matter content of the coals and shales made up amorphous (0-65%), herbaceous (3-20%), woody (20-95%) and coaly (0-15%).