Structure of high-molecular components and their influence on the properties of oils from Syrian fields

IF 7.5 1区工程技术 Q2 ENERGY & FUELS Fuel Pub Date : 2025-03-20 DOI:10.1016/j.fuel.2025.135053

G. Mansour , Lyudmila V. Ivanova , Veronika.K. Miller , Vladimir N. Koshelev , Younes Djouadi , Mohamed-Said Chemam , Mohammed A. Khelkhal , Aleksandr A. Rodionov , Alexey V. Vakhin

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Abstract

This study investigated the physico-chemical properties and component composition of four crude oils from Syrian oilfields. High-performance liquid chromatography (HPLC), gas–liquid chromatography (GLC), Fourier transform infrared (FTIR) spectroscopy, ¹³C and ¹H nuclear magnetic resonance (NMR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry was used to identify structural-group composition of oils and molecular characteristics of extracted asphaltenes and resins. Results demonstrated an increase in aromaticity coefficient and a decrease in aliphaticity coefficient in the sequence: oil → resins → asphaltenes. Bituminous oil, containing the highest total content of resins and asphaltenes (>25.0 %) and predominant bicyclic aromatic structures (17.7 %), demonstrated a high tendency for structure formation and low aggregative stability, primarily due to asphaltene precipitation. Rheological studies revealed significant viscosity increases at +10 °C in oil with high resin asphaltene content due to asphaltene aggregation. At −10 °C, structure formation occurred through solid paraffin crystallization, with paraffinic oil showing the highest energy of oil dispersed system structure destruction (ODS). The study demonstrates the influence of high-molecular oil compounds’ structural-group composition on structure formation in the oil system.

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叙利亚油田高分子组分的结构及其对油性质的影响

本研究研究了叙利亚油田四种原油的理化性质和组分组成。采用高效液相色谱（HPLC）、气相液相色谱（GLC）、傅里叶变换红外（FTIR）光谱、13C和1H核磁共振（NMR）光谱、电子顺磁共振（EPR）光谱和基质辅助激光解吸/电离（MALDI）质谱等方法，鉴定了油品的结构-基团组成和提取的沥青质和树脂的分子特征。结果表明：油→树脂→沥青质，芳香性系数增大，脂肪性系数减小。沥青油中树脂和沥青质总含量最高（25.0%），双环芳烃结构含量最高（17.7%），结构形成倾向高，聚集稳定性低，主要原因是沥青质沉淀。流变学研究表明，在+10°C时，由于沥青质聚集，树脂沥青质含量高的石油粘度显著增加。在−10℃时，固体石蜡结晶形成结构，石蜡油表现出最高的油分散体系结构破坏（ODS）能量。研究证明了高分子油类化合物的结构-基团组成对油类体系结构形成的影响。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.