MINERALOGICAL CHARACTERISTICS OF DOLOMITE IN THE 1ST MEMBER OF MEISHAN FORMATION OF THE XISHA ISLANDS

FU Heping; SHEN Jiangyuan; MA Xiao; XU Hong; ZHANG Daojun; SU Dapeng; DONG Gang; YAN Guijing; LIU Xinyu; YAN Zhuoyu

doi:10.16028/j.1009-2722.2020.188

2021 Vol. 37, No. 6

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Article navigation > Marine Geology Frontiers > 2021 > 37(6): 31-38

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FU Heping, SHEN Jiangyuan, MA Xiao, XU Hong, ZHANG Daojun, SU Dapeng, DONG Gang, YAN Guijing, LIU Xinyu, YAN Zhuoyu. MINERALOGICAL CHARACTERISTICS OF DOLOMITE IN THE 1ST MEMBER OF MEISHAN FORMATION OF THE XISHA ISLANDS[J]. Marine Geology Frontiers, 2021, 37(6): 31-38. doi: 10.16028/j.1009-2722.2020.188

Citation:

FU Heping, SHEN Jiangyuan, MA Xiao, XU Hong, ZHANG Daojun, SU Dapeng, DONG Gang, YAN Guijing, LIU Xinyu, YAN Zhuoyu. MINERALOGICAL CHARACTERISTICS OF DOLOMITE IN THE 1ST MEMBER OF MEISHAN FORMATION OF THE XISHA ISLANDS[J]. Marine Geology Frontiers, 2021, 37(6): 31-38. doi: 10.16028/j.1009-2722.2020.188

MINERALOGICAL CHARACTERISTICS OF DOLOMITE IN THE 1ST MEMBER OF MEISHAN FORMATION OF THE XISHA ISLANDS

1.
China University of Petroleum (East China), Qingdao 266580, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
Changjiang University, Wuhan 430100, China
4.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
5.
Zhanjiang Branch of CNOOC (China) Ltd., Zhangjiang 524057, China
6.
CNOOC EnerTech-Drilling and Production Co., Zhanjiang 524057, China

More Information

Corresponding author: XU Hong, qdxhong@163.com

Received Date: 30 November 2020

Publish Date: 28 June 2021

Abstract

Abstract

In the South China Sea, dolomite is not only a kind of oil and gas reservoir, but also the deposits closely related to the genesis of reefal complex. In this paper, mineralogical analysis is made for the 600～750 m interval of core section of the Meishan Formation in the Xisha Islands. The research is focused on a new horizon of middle to deep dolomite, 600～1000 m from the well of Xike 1, which may become oil and gas reservoir in the future. A large number of rhombic crystals are found by SEM. EDS analysis suggests that the rhombic crystals are dominated by Ca and Mg in elements. XRD analysis further confirms that they are dominated by dolomite; excluding the surficial clastic deposits which consists of calcite. EDS detected some Si from the samples, indicating the mixing of terrigenous materials. However, no Si has been found on the smooth surface of dolomite crystals by EDS. The content of SiO₂ increases with MgO in the dolomite. It is speculated that there is terrigenous material input during the formation of dolomite in the regression period. XRD results found that thick dolomite of medium order is developed in 620～646.5 m of the core, and the proportion of calcite begins to increase from 646 m.
- well Xike 1 /
- Meishan Formation /
- dolomite /
- SEM /
- EDS /
- XRD

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References

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