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Petrological evidence of kaolinite transformation to dawsonite

Lily Gui、Liu Li、Miao Yu、Liu Na、Huidong Yang、Yongmei Zhang

2012世界地质：英文版Environmental Science被引 2

摘要

Clay minerals , especially authigene kaolinite , are abundant in the dawsonite-bearing sandstone from the Gudian and Qian'an regions in the southern Songliao Basin. The relationship between dawsonite and kaolin- ite has been investigated based on drilling data from 50 wells in the Jilin Oil Field and petrological characteris- tics analyses on 23 core samples from the Gudian and Qian'an regions. The study revealed a negative relation- ship between the content of dawsonite and kaolinite , suggesting that kaolinite was replaced by the dawsonite. Combined with thermodynamics and geochemical analysis published previously , it is concluded that kaolinite is unstable under CO 2 -rich environments and can transform into dawsonite.

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