Xinjiang Petroleum Geology ›› 2011, Vol. 32 ›› Issue (1): 11-13.

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Evaluation of Paleogene Dingqinghu Source Rocks in Dongcuo Basin, Tibet

ZENG Jinga, LI Ya-lina,b, WANG Li-chenga,b   

  1. China University of Geosciences, a. School of Earth Sciences and Resources, b. Research Center for Tibetan Plateau Geology, Beijing 100083, China
  • Received:2010-04-12 Published:2020-08-07

Abstract: Dongcuo basin located in the central Tibet is a Tertiary continental basin, which is mainly composed of Neogene Kangtuo formation, Paleogene Dingqinghu formation and Niubao formation. The stratigraphy, sedimentary facies analysis indicates that the source rocks are dominated by mudstone, marl and limestone of Dingqinghu formation with a maximum thickness of mudstone of 40 m, carbonate rocks of 72 m. The TOC of marl and limestone averages 0.51%, belonging to medium-good source rocks. The TOC of the dark mudstone in lower section of Dingqinghu formation in semi-deep lake facies averages 5.92%, classifying as high-quality source rocks. The organic matters are dominated by Type I and TypeⅡ. The Tmax (431~456℃) and Ro (0.36%~0.66%) suggest that the source rocks of Dingqinghu formation reach the early maturity, being of good hydrocarbon-genetic potential and explorative prospecting in Dongcuo basin.

Key words: Tibet, Dongcuo basin, Paleogene, Dingqinghu formation, source rock, organic geochemistry

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