珠江口盆地白云凹陷始新统-下渐新统沉积环境与泥岩物源

doi:10.7623/syxb201605005

石油学报 ›› 2016, Vol. 37 ›› Issue (5): 610-621.DOI: 10.7623/syxb201605005

珠江口盆地白云凹陷始新统-下渐新统沉积环境与泥岩物源

马明^1,2, 陈国俊¹, 吕成福¹, 张功成³, 李超¹, 赵钊³, 沈怀磊³

1. 甘肃省油气资源研究重点实验室中国科学院油气资源研究重点实验室甘肃兰州 730000;
2. 中国科学院大学北京 100049;
3. 中海油研究总院北京 100027

收稿日期:2015-10-21 修回日期:2016-03-06 出版日期:2016-05-25 发布日期:2016-06-06
通讯作者: 陈国俊,男,1967年1月生,1986年获西北大学石油与天然气地质学专业学士学位,2010年获中国科学院研究生院地球化学专业博士学位,现为中国科学院地质与地球物理研究所兰州油气资源研究中心研究员、博士生导师,主要从事石油地质学与储层沉积学研究。Email:gjchen@lzb.ac.cn
作者简介:马明,男,1989年12月生,2012年获兰州大学地质学专业学士学位,现为中国科学院大学博士研究生,主要从事储层沉积学方面的研究工作。Email:13893681262@163.com
基金资助:
国家重大科技专项"海洋深水区油气勘探关键技术"(2011ZX05025-006)资助。

Eocene-Low Oligocene sedimentary environment and mudstone provenance in Baiyun sag, Pearl River Mouth Basin

Ma Ming^1,2, Chen Guojun¹, Lü Chengfu¹, Zhang Gongcheng³, Li Chao¹, Zhao Zhao³, Shen Huailei³

1. Key Laboratory of Petroleum Resources, Gansu Province;Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences, Gansu Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. CNOOC Research Institute, Beijing 100027, China

Received:2015-10-21 Revised:2016-03-06 Online:2016-05-25 Published:2016-06-06

摘要/Abstract

摘要：

通过粒度分析、岩石薄片、扫描电镜、X-射线荧光及元素地球化学分析等多种手段,研究了珠江口盆地白云凹陷始新统-下渐新统的沉积环境、物源、风化程度、源区岩性及构造背景等。微量元素V、Cr、Sc、Ni、Co、U、Th含量及其比值表明,白云凹陷边缘在恩平组及文昌组沉积时期属于氧化环境。恩平组砂岩样品的CIA值分布于47.82~65.15,平均值为59,泥岩CIA值介于62.61~81.68,平均值为73.07,表明碎屑颗粒从物源区至沉积盆地经历了低-中等强度的风化,砂岩薄片中火山碎屑颗粒较多,其清晰的结构特征与CIA指数相印证。稀土元素总量(136.96×10^-6~313.85×10^-6)相对较高,LREE/HREE值(3.02~6.76)、(La/Yb)_N值(7.87~20.45)、(La/Sm)_N值(3.75~5.78)、(Gd/Yb)_N值(1.14~2.09)、δEu值(0.5~0.92)、δCe值(0.94~1.07)等显示,研究区轻稀土(LREE)相对富集,重稀土(HREE)相对亏损,铕具有"V"形负异常,铈异常不明显,曲线表现为明显右倾,与PAAS的分布形态及含量特征类似,表明样品物源来自上地壳。Hf-La/Th与La/Yb-∑REE等表明研究区母岩以华南沿海地区发育的中生代花岗岩为主,有部分古老沉积岩及碱性玄武岩混入,具有多源性;La-Th-Sc与Th-Co-Zr/10表明沉积构造背景属于大陆岛弧和活动大陆边缘环境。

关键词: 白云凹陷, 始新统, 下渐新统, 沉积环境, 物源, 构造背景

Abstract:

Based on grain size analysis, rock thin section, scanning electron microscope, X-ray fluorescence, elemental geochemical analysis and other methods, a study was performed on the Eocene-Low Oligocene sedimentary environment, provenance, weathering intensity, source lithology and tectonic settings in Baiyun Depression, Pearl River Mouth Basin. Trace element (V, Cr, Sc, Ni, Co, U and Th) contents and their ratios suggest that there exists an oxidation environment at the edge of Baiyun Depression in Enping Formation and Wenchang Formation. The CIA values of sandstone and mudstone samples in Enping Formation are ranged within 47.82-65.15 and 62.61-81.68 with an average of 59 and 73.07 respectively, indicating that clastic particles experienced low-medium weathering from provenance area to sedimentary basin, where there were a lot of volcanic debris in the sandstone thin sections with clear structure as an evidence of CIA index. The amount of ∑REE (136.96×10^-6-313.85×10^-6) is relatively high. The LREE/HREE value (3.02-6.76), (La/Yb)_N value (7.87-20.45), (La/Sm)_N value (3.75-5.78), (Gd/Yb)_N value (1.14-2.09), δEu value (0.5-0.92) and δCe value (0.94-1.07) show that light rare earth element is relatively enriched in this area, but heavy rare earth element is deficient; Eu presents V-shaped negative anomaly while Ce is normal. The REE curve shows an obvious rightward tilting, similar to the distribution morphology and content characteristics of PAAS, proving that sample provenance is sourced from upper crust. The diagrams of Hf-La/Th and La/Yb-∑REE reflect that parent rocks are dominated by Mesozoic granite developed in coastal areas of South China, mixed with certain ancient sedimentary rocks and alkali basalt, thus leading to polyphyly. The diagrams of La-Th-Sc and Th-Co-Zr/10 suggest that the sedimentary tectonic setting is a continental island arc or active continental margin environment.

Key words: Baiyun Depression, Eocene, Low Oligocene, sedimentary environment, provenance, tectonic setting

中图分类号:

TE121.3

马明, 陈国俊, 吕成福, 张功成, 李超, 赵钊, 沈怀磊. 珠江口盆地白云凹陷始新统-下渐新统沉积环境与泥岩物源[J]. 石油学报, 2016, 37(5): 610-621.

Ma Ming, Chen Guojun, Lü Chengfu, Zhang Gongcheng, Li Chao, Zhao Zhao, Shen Huailei. Eocene-Low Oligocene sedimentary environment and mudstone provenance in Baiyun sag, Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2016, 37(5): 610-621.

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珠江口盆地白云凹陷始新统-下渐新统沉积环境与泥岩物源

Eocene-Low Oligocene sedimentary environment and mudstone provenance in Baiyun sag, Pearl River Mouth Basin

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