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。
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.
作者
方朋
吴嘉
李勃天
王选策
钟宁宁
Fang Peng;Wu Jia;Li Botian;Wang Xuance;Zhong Ningning(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of New Energy and Materials,China University of Petroleum(Beijing),Beijing 102249,China;Research Centre for Earth System Science,Yunnan University,Yunnan Kunming 650500,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2021年第5期623-633,653,共12页
Acta Petrolei Sinica
基金
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)
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。
关键词
沥青质
吸附烃
洗脱
分馏
生物降解
长江沟组
asphaltene
adsorbed hydrocarbons
elution
fractionation
biodegradation
Changjiangou Formation
