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地球科学进展  2015, Vol. 30 Issue (2): 187-195    DOI: 10.11867/j.issn.1001-8166.2015.02.0187
综述与评述     
石油系统Re-Os同位素体系封闭性研究进展
沈传波1, 2, 刘泽阳2, *, 肖凡2, 胡迪2, 杜嘉祎2
1. 构造与油气资源教育部重点实验室,中国地质大学, 湖北武汉430074; 2. 中国地质大学资源学院, 湖北 武汉430074
Advancements of the Research on Re-Os Isotope System in Petroleum System
Shen Chuanbo1, 2, Liu Zeyang2, Xiao Fan2, Hu Di2, Du Jiayi2
1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan, 430074, China; 2. Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China
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摘要:

Re-Os同位素定年在石油生成及富有机质沉积岩的绝对定年方面取得了良好的应用效果,并且石油的Os同位素初始值还可以作为油源示踪的指标。分析了Re-Os同位素定年方法在富有机质体系中应用的原理,探讨了影响同位素体系封闭性的各种因素,指出熟化作用、生物降解及水洗作用、脱沥青作用不会影响Re-Os同位素体系的封闭性,而硫酸盐热化学还原作用、成矿流体作用及幔源岩浆混染会扰动Re-Os同位素体系。目前石油系统中Re-Os同位素研究存在的主要问题可归结为2个方面:①石油系统有机质中Re-Os同位素的地球化学行为;②Re-Os同位素年龄的精度及其指示意义。对于这2个方面,开展有机相及现代海藻与Re-Os同位素相关性的研究将有助于了解Re和Os在有机质中的具体富集形式;对控制Re-Os同位素分馏的因素(如沉积环境及有机质类型)的研究将会有助于鉴别哪些地层以及什么样的样品能用来进行Re-Os定年。

关键词: 有机质类型生物降解熟化作用HT5K]富有机质沉积岩沉积环境    
Abstract:

Re-Os isotope geochronometer has achieved a lot in getting absolutely precise ages of petroleum generation and Organic-Rich Sedimentary (ORS) rocks. And what’s more, the initial 187Os/188Os ratios can be utilized as an oil to source fingerprinting tool in the oil-source correlation. This paper analyzed the principles of Re-Os isotope dating methods applied in Organic-Rich Sedimentary systems, and discussed the various factors of influences on the Re-Os isotope system. Those geological processes such as the maturation of hydrocarbon, biodegradation and water washing and the progressive precipitation of petroleum asphaltenes had very little effect on Re-Os isotope system. However, Re-Os isotope system could be disturbed by Thermochemical Sulfate Reduction (TSR), hydrothermal fluid and the contamination of mantle-fluid. The main problems of the research on Re-Os isotope in petroleum system at present can be attributed to two aspects: ①the understanding of geochemical behavior of Re and Os in organic maters; ②how to get precise Re-Os isotope ages and the interpretation for the ages. In terms of these two aspects, carrying out the research of the relationship between Re-Os data and organic faces and modern algae may help the better understanding of Re-Os geochemical behavior and their enrichment mechanism. The research about the factors (e.g. depositional environment and organic type) that control Re-Os fractionation may provide a method to know which stratigraphic sections and which samples to utilize for Re-Os geochronology.

Key words: Hydrocarbon maturation    Organic-rich sedimentary rock    Biodegradation    Organic matter type.    Sedimentary environment
出版日期: 2015-02-20
:  P618.13  
基金资助:

国家自然科学基金项目“南方典型古油藏沥青来源和形成时代的Re-Os-PGE示踪研究”(编号:41372140)资助

通讯作者: 通讯作者:刘泽阳(1992-),男,河北沧州人,主要从事同位素地球化学的研究. E-mail:yongheqi@163.com     E-mail: yongheqi@163.com
作者简介: 作者简介:沈传波(1979-),男,湖北监利人,教授,主要从事盆山构造热演化及油气成藏研究. E-mail: cbshen@cug.edu.cn
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引用本文:

沈传波, 刘泽阳, 肖凡, 胡迪, 杜嘉祎. 石油系统Re-Os同位素体系封闭性研究进展[J]. 地球科学进展, 2015, 30(2): 187-195.

Shen Chuanbo, Liu Zeyang, Xiao Fan, Hu Di, Du Jiayi. Advancements of the Research on Re-Os Isotope System in Petroleum System. Advances in Earth Science, 2015, 30(2): 187-195.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2015.02.0187        http://www.adearth.ac.cn/CN/Y2015/V30/I2/187

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