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Global Geology 2012, 15(2) 105-113 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Petrological evidence of kaolinite transformation to dawsonite |
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GUI Lily1, 2, LIU Li1, YU Miao1, LIU Na1, YANG Huidong1, 3 and ZHANG Yongmei4 |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� CNPC Key Laboratory for Basin Structure and Hydrocarbon Accumulation��Research Institute of Petroleum Exploration and Development��PetroChina��Beijing 100083��China; 3�� Exploration and Development Research Institute��Jilin Oilfield Branch��PetroChina��Songyuan 138001��Jilin��China; 4�� Exploration and Development Research Center��Qinghai Oilfield��CNPC��Dunhuang 736202��Gansu��China |
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Abstract:
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 kaolinite has been investigated based on drilling data from 50 wells in the Jilin Oil Field and petrological characteristics analyses on 23 core samples from the Gudian and Qian'an regions�� The study revealed a negative relationship 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 CO2-rich environments and can transform into dawsonite�� |
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Keywords:
kaolinite
dawsonite
transformation
Songliao Basin
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