Article

Chinese Journal of Geochemistry

, Volume 23, Issue 1, pp 52-56

Study of the factors affecting the abundance of organic matter in Jurassic carbonate rocks in Qiangtang Basin, Tibet

  • Wen ZhigangAffiliated withResearch Center of Organic Geochemistry, Jianghan Petroleum University
  • , Hu MingyiAffiliated withResearch Center of Organic Geochemistry, Jianghan Petroleum University
  • , Gong WenpingAffiliated withResearch Center of Organic Geochemistry, Jianghan Petroleum University
  • , Xiao ChuantaoAffiliated withResearch Center of Organic Geochemistry, Jianghan Petroleum University

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Abstract

Field and laboratory analyses of carbonate rock samples from the Qiangtang Basin, Tibet, indicate that carbonate source rocks are mainly developed in the Middle Jurassic Xiali Formation and Upper Jurassic Suowa Formation. Comprehensive studies showed that the Suowa Formation carbonate source rocks have a favorable hydrocarbon-generating potential. The abundance of organic matter in the carbonate rocks is controlled mainly by sedimentary environment and inorganic compounds in the rocks, which is higher in the restricted platform facies than in the open platform facies. Organic carbon contents decrease with increasing CaO contents in the source rocks.

Key words

Qiangtang Basin Jurassic carbonate rock organic-carbon content sedi-mentary environment inorganic compound