1.Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences, Beijing.100029 2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing.100029 3.MOE Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing),Beijing.102249
Abstract The Changxing Formation reservoir in northeastern Sichuan Basin is mainly composed of fine to medium sized crystalline dolomites,and some mud sized crystalline dolomites secondly. Observation of thin sections under cathodoluminescence reveals that the fine-medium sized crystalline dolomites and mud sized crystalline dolomites look very dark. Micro-probe analysis reveals that the Mg,Ca,Fe,Mn,Sr,Na and Ba content is constant from the core of the fine-medium sized crystalline dolomite crystals to their margins,thus it is speculated that the fine-medium sized crystalline dolomites are transformed from previous mud sized crystalline dolomites by recrystallization in penecontemporaneous period. The main factor controlling the recrystallization is the infiltration high-Mg brine caused by evaporation which provides new ideas for determining the reservoir distribution of dolomites in the study area.
About author: Zhao Rui,born in 1988,is a Ph.D. candidate in the Institute of Geology and Geophysics,Chinese Academy of Sciences. Now he is mainly engaged in origin of dolomites and diagenesis of carbonates. E-mail: zhaoruizky2013@126.com.
Cite this article:
Zhao Rui,Wu Yasheng,Qi Enguang et al. Geochemistry and origin of dolomites of the Upper PermianChangxing Formation in northeastern Sichuan Basin[J]. JOPC, 2014, 16(5): 747-760.
Zhao Rui,Wu Yasheng,Qi Enguang et al. Geochemistry and origin of dolomites of the Upper PermianChangxing Formation in northeastern Sichuan Basin[J]. JOPC, 2014, 16(5): 747-760.
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