Organic facies characteristics in the Paleocene shale of the northern part of the Tuz Golu Basin, Central Anatolia, Turkey

Ayyildiz T.

ENERGY SOURCES, cilt.23, sa.8, ss.727-737, 2001 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 8
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1080/009083101316862480
  • Dergi Adı: ENERGY SOURCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.727-737
  • Anahtar Kelimeler: Tuz Golu, Haymana-Polatli, Bala, Kirkkavak formation, Karapinaryaylasi formation, organic facies, EVOLUTION
  • Ankara Üniversitesi Adresli: Evet

Özet

Paleocene sequence in the Tuz Golu Basin displays a range of lithofacies that vary greatly in thickness. The Paleocene units are made up of sandstone, conglomerate, shale, and limestone. Organic-rich intervals are present in the Paleocene of marine shale with 0.02-1.88 wt% organic carbon content. Pyrolysis yields (S-1 + S-2 = 80-10100 ppm) indicate that some intervals within the Paleocene shale have weak to good gas potential. It contains type III organic matter based upon Rock-Eval pyrolysis assay. Both organic petrographic and geochemical parameters place the Paleocene shale of the Tuz Golu Basin within the CD and D or C organic facies of Jones (1987). The lower sulphur content (< 0.08%) in the Paleocene units point to normal marine depositional conditions. Maturity is high in the lower Paleocene units where T-max values are above 465C. Most of the Upper Paleocene rocks are thermally immature to marginally mature with T-max ranging from 345 to 456 degreesC. The high oxygen index indicates that organic matter in the Paleocene units possibly generated other organic matter or alteration organic matter. Therefore we believe that Paleocene units may have gas and/or oil potential in the Tuz Golu basin, provided that no alteration took place in organic matter.