不同洗脱法分离沥青质吸附烃的对比

doi:10.7623/syxb202105006

石油学报 ›› 2021, Vol. 42 ›› Issue (5): 623-633,653.DOI: 10.7623/syxb202105006

不同洗脱法分离沥青质吸附烃的对比

方朋¹, 吴嘉¹, 李勃天², 王选策³, 钟宁宁¹

1. 中国石油大学(北京)油气资源与探测国家重点实验室北京 102249;
2. 中国石油大学(北京)新能源与材料学院北京 102249;
3. 云南大学地球系统科学研究中心云南昆明 650500

收稿日期:2020-04-11 修回日期:2021-02-09 出版日期:2021-05-25 发布日期:2021-06-05
通讯作者: 吴嘉,男,1984年1月生,2006年获北京大学应用化学专业学士学位,2013年获法国克莱蒙费朗第二大学岩石学专业博士学位,现为中国石油大学(北京)副教授,主要从事实验地球化学及油气地球化学研究。Email:jia.wu@cup.edu.cn
作者简介:方朋,男,1995年1月生,2018年获中国石油大学(北京)资源勘查工程专业学士学位,现为中国石油大学(北京)地质学专业博士研究生,主要从事有机地球化学研究。Email:2018211036@student.cup.edu.cn
基金资助:
国家自然科学基金青年科学基金项目"含水体系中二苯并噻吩热稳定性的实验研究"（No.41403049）和油气资源与探测国家重点实验室自主课题项目"沥青质次级结构与中小分子的相互作用"（PRP/indep-3-1715）资助。

Comparison of separation of asphaltene adsorbed hydrocarbons by different elution methods

Fang Peng¹, Wu Jia¹, Li Botian², Wang Xuance³, Zhong Ningning¹

1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. College of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China;
3. Research Centre for Earth System Science, Yunnan University, Yunnan Kunming 650500, China

Received:2020-04-11 Revised:2021-02-09 Online:2021-05-25 Published:2021-06-05

摘要/Abstract

摘要： 沥青质是烃源岩抽提物和原油中具有复杂分子结构的重组分，能够吸附很多小分子烃类。前人多利用各种洗脱法来分离被沥青质吸附的小分子烃类，但并未进行系统对比。利用川西北矿山梁地区的天然沥青样品，通过沉淀法、抽提法、离心法和柱层析法分离沥青质中的吸附烃。研究结果表明，不同的洗脱法对沥青质吸附烃的分离效果是不同的，这会使产物的族组成及部分分子标志物产生分馏。沉淀法、抽提法对沥青质吸附烃的分离效果有限，而离心法能够明显分离出吸附组分。部分分子标志物参数的变异揭示了样品中游离烃遭受了中等—严重程度的生物降解，而吸附烃则得到了沥青质的保护，能够在一定程度上反映更真实的地球化学信息。

关键词: 沥青质, 吸附烃, 洗脱, 分馏, 生物降解, 长江沟组

Abstract: Asphaltene is a heavy fraction with complex molecular structure in source rock extracts and crude oils, and can adsorb many small-molecule hydrocarbons. Although a variety of elution methods have been test so far for separating the trapped small-molecule hydrocarbons from the asphaltene matrix, no attempt has been made to systematically compare their efficiencies. In this study, absorbed hydrocarbons were extracted from the natural asphalt samples in the Kuangshanliang area of Northwest Sichuan by extraction, centrifugation and column chromatography. The results showed that different elution methods varied in separation efficiency, with centrifugation being much more effective than precipitation or extraction. This led to fractionation on the group composition of the product and some molecular markers. Variations of some molecular marker parameters revealed that free hydrocarbons in the samples underwent moderate to severe biodegradation, whereas the adsorbed hydrocarbons were largely preserved and therefore could serve as more reliable geochemical markers.

Key words: asphaltene, adsorbed hydrocarbons, elution, fractionation, biodegradation, Changjiangou Formation

中图分类号:

TE122.1

方朋, 吴嘉, 李勃天, 王选策, 钟宁宁. 不同洗脱法分离沥青质吸附烃的对比[J]. 石油学报, 2021, 42(5): 623-633,653.

Fang Peng, Wu Jia, Li Botian, Wang Xuance, Zhong Ningning. Comparison of separation of asphaltene adsorbed hydrocarbons by different elution methods[J]. Acta Petrolei Sinica, 2021, 42(5): 623-633,653.

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不同洗脱法分离沥青质吸附烃的对比

Comparison of separation of asphaltene adsorbed hydrocarbons by different elution methods

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