Petrological evidence of kaolinite transformation to dawsonite

作     者：GUI Lily LIU Li YU Miao LIU Na YANG Huidong ZHANG Yongmei 

作者机构：College of Earth Sciences Jilin University Changchun 1300061 China CNPC Key Laboratory for Basin Structure and Hydrocarbon Accumulation Research Institute of Petroleum Exploration and Development PetroChina Beijing 10083 China Exploration and Development Research Institute Jilin Oilfield Branch PetroChina Songyuan 138001 Jilin China Exploration and Development Research Center Qinghai Oilfield CNPC Dunhuang 736202 Gansu China 

出 版 物：《Global Geology》 (世界地质（英文版）)

年 卷 期：2012年第15卷第2期

页      面：105-113页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Supported by project of the National Science Foundation of China(Nos.41172091 40672074) 

主　　题：kaolinite dawsonite transformation Songliao Basin 

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 kaolinite has been investigated based on drilling data from 50 wells in the Jilin Oil Field and petrological cbaracteristics 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.