Organic geochemical characteristics of Miocene bituminous units in the Beypazari Basin, Central Anatolia, Turkey

Ozcelik O., Altunsoy M.

ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, cilt.30, sa.2A, ss.181-194, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30 Sayı: 2A
  • Basım Tarihi: 2005
  • Dergi Adı: ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.181-194
  • Anahtar Kelimeler: Beypazari Basin, organic geochemistry, Middle-Upper Miocene, bituminous rocks, DEPOSITIONAL-ENVIRONMENTS, CRUDE OILS, BIOMARKERS
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Middle-Upper Miocene units of the Beypazari Basin (Central Anatolia Turkey) are represented by conglomerate, agglomerate, sandstone, siltstone, claystone, coal, bituminous shale, limestone, and tuff. Extensive outcrops of bituminous horizons just above coal are observed in the region. Total organic carbon contents of the bituminous horizon vary from 0.37 to 7.07 wt%. Organic matter is predominantly of algal origin consisting of Type I and Type 11 kerogens. Low vitrinite reflection index (R-o = 0.27 - 0.56 %) and T-max (409 - 437 degrees C) values, together with the Ts/Tm ratio of 1.5, indicate that the organic matter is immature. Biomarker characteristics verify these results. According to the Pr/n-C-17 and Ph/n-C-18, ratios the bituminous units were deposited as organic-rich muds in reducing lacustrine environments.