西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2023.01.010

古地理学报 ›› 2023, Vol. 25 ›› Issue (1): 149-162. doi: 10.7605/gdlxb.2023.01.010

• 岩相古地理学及沉积学 • 上一篇下一篇

西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征^*

马亚增^1,2, 陈舒^1,2, 刘震¹, 王亚如¹, 魏浩天³, 韦志浩¹, 张子瑾⁴, 许红^2,5, 罗进雄¹

1 长江大学地球科学学院,湖北武汉 430100;
2 自然资源部第一海洋研究所,山东青岛 266061;
3 中国海洋大学海洋地球科学学院,山东青岛 266100;
4 中国石油渤海钻探工程公司工程技术研究院,天津 300457;
5 中国地质调查局青岛海洋地质研究所,山东青岛 266071

收稿日期:2021-12-02 修回日期:2022-07-16 出版日期:2023-02-01 发布日期:2023-02-17
通讯作者: 罗进雄,1980年生,副教授,主要从事沉积学的教学与研究工作。E-mail: 6071637@qq.com。许红,1957年生,教授,研究员,主要从事油气地质调查与资源勘探评价及海洋生物礁成因研究工作。E-mail: xuhong8320@163.com。
作者简介:马亚增,男,1994年生,硕士研究生,主要从事沉积学研究工作。E-mail: 3495983189@qq.com。
基金资助:
* 国家自然科学基金(编号: 41872114)、国家科技基础资源调查专项(编号: 2017FY201407)和大型油气田和煤层气重大科技专项(编号: 2011ZX05025-002-04)联合资助

Mineral and rare earth elements characteristics of tight dolomite surrounding rock in the Member 1 of Sanya Formation in Well Xike 1,Xisha Islands,China

MA Yazeng^1,2, CHEN Shu^1,2, LIU Zhen¹, WANG Yaru¹, WEI Haotian³, WEI Zhihao¹, ZHANG Zijin⁴, XU Hong^2,5, LUO Jinxiong¹

1 School of Geosciences,Yangtze University,Wuhan 430100,China;
2 The First Institute of Oceanography,MNR,Shandong Qingdao, 266061,China;
3 College of Marine Geosciences,Ocean University of China,Shandong Qingdao 266100,China;
4 Engineering Technology Research Institute,CNPC, Bohai Drilling Engineering Company Limited,Tianjin 300457,China;
5 Qingdao Institute of Marine Geology,China Geological Survey,Shandong Qingdao 266071,China

Received:2021-12-02 Revised:2022-07-16 Online:2023-02-01 Published:2023-02-17
Contact: LUO Jinxiong,born in 1980,associate professor,mainly engaged in sedimentology. E-mail: 6071637@qq.com. XU Hong,born in 1957,professor and researcher,mainly engaged in oil and gas geological survey and resource exploration and evaluation,and research on the genesis of marine reefs. E-mail: xuhong8320@163.com.
About author:MA Yazeng,born in 1994,postgraduate students,mainly engaged in sedimentology research. E-mail: 3495983189@qq.com.
Supported by:
Co-funded by the National Natural Science Foundation of China(No.41872114),National Science and Technology Fundamental Resources Survey Project(No.2017FY201407)and Major Scientific and Technological Projects for Large Oil and Gas Fields and Coalbed Methane(No.2011ZX05025-002-04)

摘要/Abstract

摘要： 西沙群岛西科1井致密白云岩具有低孔低渗特征,前人证实其是由填隙物与围岩2个相互独立的岩石矿物学端元组成,同时西沙群岛远离陆架,其内碳酸盐岩中的地球化学指标尤其稀土元素可以很好地指示古海洋和沉积环境。作者以致密白云岩围岩为研究对象,通过显微观察、SEM-EDS(场发射扫描电子显微镜-X射线能谱仪)、激光原位剥蚀技术分析其矿物及稀土元素特征。结果表明围岩中白云石以细晶白云石为主,包括自形、半自形及他形,孔隙细小,发育典型雾心亮边构造。稀土配分表现为LREE亏损、La正异常、Ce负异常、高Y/Ho值等典型海相碳酸盐岩稀土元素特征。此外Eu具有正异常,认为与来自海底的热液活动有关。

关键词: 西沙群岛, 西科1井, 致密白云岩, 围岩白云石特征, 稀土元素特征, 热液

Abstract: Tight dolomite in Well Xike 1,Xisha Islands,which featured with low porosity and permeability,which is proven to be composed of two mutually-independent rock mineralogical end-members,interstitial material and surrounding rock according to previous studies. Moreover,since the Xisha Islands are far away from the continental shelf,the geochemical indexes of carbonate rocks on the islands,especially the rare earth elements,are great indicators for the paleo-ocean and sedimentary environment. Hence,the surrounding rock of tight dolomite was studied over its minerals and rare earth elements by means of microscopic observation,SEM-EDS(Scanning Electron Microscope-Energy Dispersive Spectrometer)and laser in-situ denudation technology. The findings show that the surrounding rock is dominated by fine-grained dolomite in automorphic,hypautomorphic and xenomorphic properties with small pores,where developed typical structure with fogged center and clear margin. Further,typical rare earth elements of marine carbonate rocks such as LREE depletion,La positive anomaly,Ce negative anomaly,and high Y/^Ho value are represented in the rare earth element distribution is characterized by. In addition,Eu with positive anomaly is thought to be associated with the seabed hydrothermal activity.

Key words: Xisha Islands, Well Xike 1, tight dolomite, characteristics of surrounding rock dolomite, characteristics of rare earth elements, hydrothermal fluid

中图分类号:

马亚增, 陈舒, 刘震, 王亚如, 魏浩天, 韦志浩, 张子瑾, 许红, 罗进雄. 西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征^*[J]. 古地理学报, 2023, 25(1): 149-162.

MA Yazeng, CHEN Shu, LIU Zhen, WANG Yaru, WEI Haotian, WEI Zhihao, ZHANG Zijin, XU Hong, LUO Jinxiong. Mineral and rare earth elements characteristics of tight dolomite surrounding rock in the Member 1 of Sanya Formation in Well Xike 1,Xisha Islands,China[J]. JOPC, 2023, 25(1): 149-162.

http://www.gdlxb.cn/CN/Y2023/V25/I1/149

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西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征^*

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西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征*

Mineral and rare earth elements characteristics of tight dolomite surrounding rock in the Member 1 of Sanya Formation in Well Xike 1,Xisha Islands,China

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西沙群岛西科1井三亚组一段致密白云岩围岩矿物及稀土元素特征^*