| 渝东南地区石牛栏组稀土元素地球化学特征及地质意义 |
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| 引用本文： | 王杰,谭先锋,陈浩,陈青,冉天,王佳,蒋威.渝东南地区石牛栏组稀土元素地球化学特征及地质意义[J].地质找矿论丛,2017,32(2):273-285. |
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| 作者姓名： | 王杰 谭先锋 陈浩 陈青 冉天 王佳 蒋威 |
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| 作者单位： | 1. 重庆科技学院石油与天然气工程学院,重庆,401331;2. 重庆科技学院石油与天然气工程学院,重庆401331;复杂油气田勘探开发重庆市重点实验室,重庆401331;3. 重庆市地勘局208水文地质工程地质队,重庆,400700 |
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| 基金项目： | 国家自然科学基金项目，重庆市基础科学与前沿技术研究项目，重庆市教委科学技术研究项目，重庆科技学院校内基金 |
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| 摘 要： | 渝东南地区的下志留统石牛栏组作为重要的油气储集层,研究其古环境变化、物质来源及物源区构造背景具有重要意义。本文采用稀土元素总量w(ΣREE)、REE配分模式、以及w(ΣLREE)/w(ΣHREE)、w(La)_N/w(Yb)_N、w(Ce)_N/w(Yb)_N、w(La)_N/w(Sm)_N、w(Gd)_N/w(Yb)_N、δEu、δCe、Ce_(anom)等特征值研究方法,对渝东南下志留统石牛栏组典型剖面的稀土元素特征及古海洋环境和物源进行深入研究。结果表明:石牛栏组灰岩稀土元素总量略低于大陆地壳平均值,轻稀土较为富集,重稀土亏损,铕明显负异常,铈负异常较微弱。w(ΣREE)证实了石牛栏组的沉积水体由浅缓慢变深再急剧变浅的变化过程。Eu负异常、Ce负异常和C_(eanom)值均揭示石牛栏组沉积时期海水具有弱还原性。REE的分异程度反映了石牛栏组从沉积早期到沉积晚期,沉积速率总体降低。稀土元素的比值特征及w(ΣREE)—w(La)/w(Yb)图解表明其物源源自雪峰山隆起,源岩主要为沉积岩。
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| 关 键 词： | 油气储集层 下志留统石牛栏组 稀土元素 地球化学特征 渝东南地区 |
| 收稿时间： | 2016/10/24 0:00:00 |
| 修稿时间： | 2017/3/27 0:00:00 |
The REE geochemical characteristics and the geological significance of Shiniulan Formation in Southeast Chongqing |
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| WANG Jie,TAN Xianfeng,CHEN Hao,CHEN Qing,RAN Tian,WANG Jia and JIANG Wei.The REE geochemical characteristics and the geological significance of Shiniulan Formation in Southeast Chongqing[J].Contributions to Geology and Mineral Resources Research,2017,32(2):273-285. |
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| Authors: | WANG Jie TAN Xianfeng CHEN Hao CHEN Qing RAN Tian WANG Jia and JIANG Wei |
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| Affiliation: | College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China,College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;Key Laboratory of Exploration and Development of Complex Oil and Gas Fields in Chongqing, Chongqing 401331, China,Hydro-geological engineering team 208, Chongqing GEOLOGOCAL exploration Bureau, Chongqing 400700, China,College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;Key Laboratory of Exploration and Development of Complex Oil and Gas Fields in Chongqing, Chongqing 401331, China,College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China,College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;Key Laboratory of Exploration and Development of Complex Oil and Gas Fields in Chongqing, Chongqing 401331, China and College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China |
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| Abstract: | Lower Silurian Shiniulan Formation in Southeastern Chongqing is an important oil and gas reservoir.Study on its paleo-environmental changes,source material and tectonic setting is of great significance.ω(ΣREE),REE pattern,characteristic value of ω(Σ LREE)/ω(Σ HREE)、ω(La)N/ω(Yb)N、ω (Ce)N/ω(Yb)N、ω(La)N/ω(Sm)N、ω(Gd)N/ω(Yb)N、δEu、δCe、Ceanom is applied to deepen the study.The results show slightly lower value of ΣREE in Shiniulan Formation than the average value of the continental crust;relatively LREE enrichment and HREE depletion,obvious Eu anomly and weak Ce anomly.The value of ω(ΣREE) confirmes that the water body from which Shiniulan formation deposited experienced a gradual shallow-deep then abrupt deep-shallow change process.Negative anomaly of Eu,slight negative anomaly of Ce and Ceanom value reveal the weak reduced seawater.Degree of REE fractionation reflects decrease of deposition rate from early to late.The REE ratio characteristics and ω (ΣREE)ω(La)/ω(Yb) diagrams show that the source material is mainly derived from sedimentary rocks of the Xuefengshan uplift. |
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| Keywords: | oil and gas reservoir Lower Silurian Shiniulan Formation REE geochemistry Southeastern Chongqing |
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