Comparison of separation of asphaltene adsorbed hydrocarbons by different elution methods

被引：0
|
作者：
Fang P. [1 ]
Wu J. [1 ]
Li B. [2 ]
Wang X. [3 ]
Zhong N. [1 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[2] College of New Energy and Materials, China University of Petroleum (Beijing), Beijing
[3] Research Centre for Earth System Science, Yunnan University, Kunming
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2021年 / 42卷 / 05期
关键词：
Adsorbed hydrocarbons; Asphaltene; Biodegradation; Changjiangou Formation; Elution; Fractionation;
D O I：
10.7623/syxb202105006
中图分类号：
学科分类号：
摘要：
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. © 2021, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：623 / 633and653
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