岩矿测试2025，Vol.44Issue(6)：1176-1191,16.DOI:10.15898/j.ykcs.202504150090
沥青质包裹饱和烃的分散固相萃取分离与分子组成特征分析
Dispersive Solid Phase Extraction Separation and Molecular Composition Characterization of Asphaltene-Occluded Saturated Hydrocarbons
摘要
Abstract
In source rocks or crude oil systems,asphaltene-occluded hydrocarbons serve as important carriers for tracing the original composition of organic matter.The non-destructive(non-chemically disruptive)separation and characterization of these hydrocarbons are critical for understanding the source and evolution of sedimentary organic matter.This study employed dispersive solid-phase extraction(DSPE)combined with column chromatography to isolate asphaltene-occluded saturated hydrocarbons from various genetic types of sedimentary organic matter,including source rocks,coal,crude oil,and solid bitumen,and analyzed the compositional characteristics and implications of their normal chain hydrocarbons.The results indicate the following:(1)the DSPE method effectively separates asphaltene-occluded saturated hydrocarbons from samples of diverse geological origin;(2)signature even-carbon-numbered n-1-alkenes(C16-C28)are detected in source rocks,crude oil,and solid bitumen samples but not in coal samples;(3)the distribution of n-alkanes in asphaltene-occluded hydrocarbons varies significantly among genetic types,with terrestrial sedimentary organic matter exhibiting relative enrichment of higher-molecular-weight n-alkanes,closely associated with source input;(4)even-carbon-numbered n-1-alkenes(C16-C28)are commonly occluded in asphaltenes formed under reducing depositional environments,with origins traceable to the diagenetic stage.This study confirms the applicability of DSPE for separating asphaltene-occluded saturated hydrocarbons across diverse geological samples,offering a reliable method for analyzing the original geochemical information of sedimentary organic matter.Furthermore,it highlights the potential of molecular composition characteristics in asphaltene-occluded hydrocarbons as indicators of sedimentary organic matter sources.关键词
沥青质/包裹烃/分散固相萃取/正构1-烯烃/分子组成特征Key words
asphaltene/occluded hydrocarbons/dispersive solid-phase extraction(DSPE)/n-1-alkenes/molecular composition characteristics分类
天文与地球科学引用本文复制引用
方朋,吴嘉,沈斌,徐学敏,杨佳佳,翟佳..沥青质包裹饱和烃的分散固相萃取分离与分子组成特征分析[J].岩矿测试,2025,44(6):1176-1191,16.基金项目
中国地质科学院基本科研业务费项目(CSJ-2024-05,CSJ-2023-08) （CSJ-2024-05,CSJ-2023-08）
中国地质调查局地质调查项目(DD20250209002) （DD20250209002）
