原油及岩石有机抽提物中微量元素的仪器中子活化研究

Inves tigation on trace elements in crude oil and organic matter extracted from rocks with instrumental neutron activation analysis

本工作利用仪器中子活化分析方法,对我国八大油田及华南上扬子地区下古生界生油、储油岩系的有机分离沥青质的近七十个样品进行了研究,得到了Al、As、Au、Ba、Br、Cl、Co、Cr、Cs、Cu、Fe、Hf、I、Ir、Mg、Mn、Mo Na、Ni、Rb、S、Sb、Sc、Se、Sr、Th、Zn、V和部分REE近四十个元素的丰度值。这方法可以排除因灰化而导致的As、Cl、S、Se和Sb元素的丢失;色谱分离使研究各有机组分中微量元素的分布成为可能。同时初步讨论了我国原油中微量元素的基本规律。

Solvent extraction, column chromatography and instrumental neutron activation analysis (INAA) have been used to investigate the trace elements in crude oil, organic matter extracted from rocks and their related fractions. With these methods, about 70 crude oil samples from eight different oil fields in China and 6 extracted asphaltene samples of the lower paleozoic from the upper Yangtze region have been analyzed, andabout 40 elements of interest have been determined.Those elements include Al, As, Au, Ba, Br, Cl,Co, Cr, Cs, Cu, Fe, Hf, I, Ir, Mg, Mn, Mo, Na, Ni, Rb, Re, S, Sb, Sc, Se,Sr, Th, Zn, V and parts of REE. The experimental results show that the method pos-sesses several advantages, i.e.non-destructive, multi-elements, sensitive, precise and accurate. Without ashing samples, the loss of volatile elements such as Cl, S, Se and Sb are avoided. The column chromatography makes it possible to study the distributions of trace elements in different fractions of crude oil and organic matter extracted. Meanwhile, the characters of trace elements in them have also been discussed in this pager.