Xinjiang Petroleum Geology

Xinjiang Petroleum Geology ›› 2008, Vol. 29 ›› Issue (6): 687-689.

Previous Articles     Next Articles

Geochemistry of Salgan Black Shales of Middle-Upper Ordovician in Keping Outcrop, Tarim Basin

WANG Fei-yu1, DU Zhi-li1,2, ZHANG Bao-min3, ZHAO Men-jun3   

  1. 1. Insitute of Resource and Information, China University of Petroleum, Beijing 102200, China;
    2. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
    3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2008-07-29 Published:2020-11-20

PDF

429

Abstract: The Salgan formation of Middle-Upper Ordovician in Keping outcrop of Tarim basin is characterized by black shale deposit of 13.4 m in thickness intercalated with minor thin or lenticular limestone, with TOC of 0.65%～2.83%, averaging 1.63%, the total thickness of about 11～12 m, the organic matter of Type-II mainly originated from algae and acritarch. The equivalent vitrinite reflectance ranges from 1.58% to 1.61%. Its shape was related to global anoxic event of Caradoc period of Middle-Late Ordovician, with significant positive carbon isotopic excursion of carbonate. It is postulated that source rocks related to this event are widespread as major hydrocarbon source rocks in Tarim basin.

Key words: Tarim basin, Keping, balck shale, Ordovician, source rock

CLC Number: