南海西科1井上新世以来礁滩体系内部构成及其沉积模式

商志垒; 孙志鹏; 解习农; 刘新宇; 陆永潮; 廖静; 王永标; 何云龙; 黄莉; 焦祥燕

doi:10.3799/dqkx.2015.057

Volume 40 Issue 4

Apr. 2015

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Article Navigation > Earth Science > 2015 > 40(4): 697-710

Shang Zhilei, Sun Zhipeng, Xie Xinong, Liu Xinyu, Lu Yongchao, Liao Jing, Wang Yongbiao, He Yunlong, Huang Li, Jiao Xiangyan, 2015. Internal Architecture and Depositional Model of Reef-Bank System since Pliocene in Well Xike-1, the South China Sea. Earth Science, 40(4): 697-710. doi: 10.3799/dqkx.2015.057

Citation:

Shang Zhilei, Sun Zhipeng, Xie Xinong, Liu Xinyu, Lu Yongchao, Liao Jing, Wang Yongbiao, He Yunlong, Huang Li, Jiao Xiangyan, 2015. Internal Architecture and Depositional Model of Reef-Bank System since Pliocene in Well Xike-1, the South China Sea. Earth Science, 40(4): 697-710. doi: 10.3799/dqkx.2015.057

Citation:

Shang Zhilei, Sun Zhipeng, Xie Xinong, Liu Xinyu, Lu Yongchao, Liao Jing, Wang Yongbiao, He Yunlong, Huang Li, Jiao Xiangyan, 2015. Internal Architecture and Depositional Model of Reef-Bank System since Pliocene in Well Xike-1, the South China Sea. Earth Science, 40(4): 697-710. doi: 10.3799/dqkx.2015.057

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Internal Architecture and Depositional Model of Reef-Bank System since Pliocene in Well Xike-1, the South China Sea

doi: 10.3799/dqkx.2015.057

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2014-07-13
Publish Date: 2015-04-01

Abstract

Abstract

The fossil species, lithofacies types and genetic facies types of the reef-bank depositional system of Yinggehai Formation and Ledong Formation since the Pliocene have been systematically analyzed through the observation of microscopic thin slice of well Xike-1 in Xisha Islands. The results show that coral and red algae are the main reef-building organisms in the Ledong Formation, while red algae is the dominant reef-forming organism in the Yinggehai Formation. Reef-dwelling organisms in the Yinggehai and Ledong formations include primarily foraminifer, echinoderm and green algae, of which foraminifer is the most important, and green algae only develops prosperously at intervals. Ten lithofacies types have been identified according to the fossil species and their contents, and content relationship of micrite, calcsparite and intergranular pore. On this basis, reef-bank system could be divided into three genetic facies groups including reef, biodetritus beach and lagoon. Reef includes three genetic facies types, namely, reef base, reef core and reef cap, among which significant exposures can be observed at reef cap, leading to the formation of secondary pores, such as intragranular dissolved pore, moldic pore, etc.. The backreef bank only develops in well Xike-1, in which there are more content of bioclast and intergranular pore, and minor micrite in the backreef inner bank close to reef core, whereas the opposite is observed in backreef outer bank near the lagoon. Large amounts of micrite limestones with little bioclast are mainly deposited in lagoon environment. Reef-bank system only develops in transgressive system tract and highstand system tract, in which genetic facies have relatively stable vertical stack relationships. The transgressive system tract commonly forms the retrogradational genetic facies group series in which parasequence ends with genetic facies having more micrite representing the flooding surface, but highstand system tract mainly develops the progradational genetic facies group series whose parasequence ends with reef cap corresponding to exposed surface.
- the South China Sea,
- well Xike-1,
- reef-bank system,
- internal architecture,
- sedimentary model,
- sedimentology

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References(50)

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Internal Architecture and Depositional Model of Reef-Bank System since Pliocene in Well Xike-1, the South China Sea

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