西沙群岛西科1井中新统-上新统白云岩微观特征及成因

王振峰; 时志强; 张道军; 黄可可; 尤丽; 段雄; 李胜勇

doi:10.3799/dqkx.2015.050

Volume 40 Issue 4

Apr. 2015

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Article Navigation > Earth Science > 2015 > 40(4): 633-644

Wang Zhenfeng, Shi Zhiqiang, Zhang Daojun, Huang Keke, You Li, Duan Xiong, Li Shengyong, 2015. Microscopic Features and Genesis for Miocene to Pliocene Dolomite in Well Xike-1, Xisha Islands. Earth Science, 40(4): 633-644. doi: 10.3799/dqkx.2015.050

Citation:

Wang Zhenfeng, Shi Zhiqiang, Zhang Daojun, Huang Keke, You Li, Duan Xiong, Li Shengyong, 2015. Microscopic Features and Genesis for Miocene to Pliocene Dolomite in Well Xike-1, Xisha Islands. Earth Science, 40(4): 633-644. doi: 10.3799/dqkx.2015.050

Citation:

Wang Zhenfeng, Shi Zhiqiang, Zhang Daojun, Huang Keke, You Li, Duan Xiong, Li Shengyong, 2015. Microscopic Features and Genesis for Miocene to Pliocene Dolomite in Well Xike-1, Xisha Islands. Earth Science, 40(4): 633-644. doi: 10.3799/dqkx.2015.050

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Microscopic Features and Genesis for Miocene to Pliocene Dolomite in Well Xike-1, Xisha Islands

doi: 10.3799/dqkx.2015.050

1.
Zhangjiang Branch of CNOOC Ltd., Zhangjiang 524057, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China
3.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2014-07-15
Publish Date: 2015-04-01

Abstract

Abstract

The dolomites in the well Xike-1 drilled in Xisha Islands, South China Sea, are mainly found in the Upper Miocene Huangliu Formation and secondly found in the 2nd member of Pliocene Yinggehai Formation and in the Middle Miocene Meishan Formation. The major dolomite layers commonly develop below the exposed boundary that are dipped and dyed with brown ferric minerals. While the dolomite crystals are found to be bimodal with micrite and silty-fine dolomite by means of the casting thin sections, scanning electron microscope and cathodoluminescence. The hypidiomorphic micrite dolomites with flat crystal planes are the result of the dolomitization from the micrite matrix. Meanwhile, the silty-fine crystalline dolomites are clean and bright cement or dolomite crystals with misted heart and bright side, and the latter is generated from the so-called overdolomitization. It's thought that the cement dolomites are with the same composition to the misted heart of the overdolomitization dolomites due to their alike optical properties from the cathodoluminescence. It is indicated by means of the microelement and C, O isotopic measurements that the dolomite is with less iron and manganese composition, positive values of δ¹⁸O_PDB and δ¹³C_PDB. The δ¹⁸O_PDB values range from 2.293‰ to 5.072‰, and the δ¹³C_PDB are 1.214‰-3.051‰. The similar distribution of dolomite layers and the similar C, O isotopic values of dolomites in the wells Xike-1 and Xichen-1 might indicate the same or similar cause of the dolomites in these two wells in Xisha area. The dolomitization model of infiltration and circumfluence may be applied to that in the wells Xike-1 and Xichen-1. The highly permeable reef carbonates in Xisha area enabled the infiltration and circumfluence of the fluid with a high Mg/Ca ratio, which was affected by the frequent sea-level changes, the evaporitic environment in the atolls and the upwelling of the thermal fluid during the latest Miocene to Early Pliocene periods.
- Xisha,
- dolomitization,
- Miocene,
- Pliocene,
- South China Sea,
- petrology

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References(54)

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Microscopic Features and Genesis for Miocene to Pliocene Dolomite in Well Xike-1, Xisha Islands

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