Carbon isotopic fractionation during vaporization of low molecular weight hydrocarbons (C6-C12)

Qian-Yong Liang; Yong-Qiang Xiong; Jing Zhao; Chen-Chen Fang; Yun Li

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Carbon isotopic fractionation during vaporization of low molecular weight hydrocarbons (C6-C12)

机译：低分子量碳氢化合物（C6-C12）汽化过程中的碳同位素分馏

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Three series of laboratory vaporization experiments were conducted to investigate the carbon isotope fractionation of low molecular weight hydrocarbons (LMWHs) during their progressive vaporization.In addition to the analysis of a synthetic oil mixture,individual compounds were also studied either as pure single phases or mixed with soil.This allowed influences of mixing effects and diffusion though soil on the fractionation to be elucidated.The LMWHs volatilized in two broad behavior patterns that depended on their molecular weight and boiling point.Vaporization significantly enriched the 13C present in the remaining components of the C6-C9 fraction,indicating that the vaporization is mainly kinetically controlled;the observed variations could be described with a Rayleigh fractionation model.In contrast,the heavier compounds (n-Clo-n-C12) showed less mass loss and almost no significant isotopic fractionation during vaporization,indicating that the isotope characteristics remained sufficiently constant for these hydrocarbons to be used to identify the source of an oil sample,e.g.,the specific oil field or the origin of a spill.Furthermore,comparative studies suggested that matrix effects should be considered when the carbon isotope ratios of hydrocarbons are applied in the field.

机译：进行三系列实验室蒸发实验，以研究在其渐进式蒸发过程中低分子量烃（LMWH）的碳同位素分馏。除了分析合成油混合物的分析，还将个体化合物作为纯单相或混合研究具有土壤。允许施加分馏的分馏施加混合效果和扩散的影响。LMWH在两种宽的行为模式中挥发，依赖于其分子量和沸点。蒸发显着富集了剩余组分中存在的13C C6-C9分数，表明蒸发主要是在动力学上控制的;可以用瑞利分馏模型描述观察到的变化。对比度，较重的化合物（N-CLO-N-C12）显示出较小的质量损失，并且几乎没有显着的同位素在蒸发过程中的分馏，表明同位素特征仍然存在这些烃用于鉴定油样的源，例如特定的油田或溢出的起源。许可，比较研究表明，当施加碳的碳同位素比例时，应考虑基质效应在该领域。

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《石油科学（英文版）》 |2017年第2期|302-314|共13页
作者
Qian-Yong Liang; Yong-Qiang Xiong; Jing Zhao; Chen-Chen Fang; Yun Li;
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作者单位

Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Ministry of Land and Resources,Guangzhou 510760, Guangdong, China;

State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640,Guangdong, China;

State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640,Guangdong, China;

Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Ministry of Land and Resources,Guangzhou 510760, Guangdong, China;

PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;

State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640,Guangdong, China;

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Carbon isotopic fractionation during vaporization of low molecular weight hydrocarbons (C6-C12)

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