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Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-09-08 , DOI: 10.1134/s0965544121090024
J. Stevanovic 1, 2 , A. R. Rakitin 1 , K. Stojanovic 2
Affiliation  

Abstract

The paper describes an investigation of structural and geochemical properties of genetically similar crude oils from the Turija-sever field located in the South-Eastern Pannonian Basin, Serbia. Samples from 56 wells were examined by infrared spectroscopy (IR) and gas chromatography (GC). The IR spectral region of 2800– 3000 cm–1 was modeled by the sum of Lorentzian functions to reveal the contributions of aliphatic stretching vibrations, from which the alkane branching factor was evaluated. Being dependent on the aliphatic chain branching, the CH2 absorption peaks shifted by 3–4 cm–1 towards high frequencies when passing from the least-branched to the most-branched oil samples. This is associated with an increase in the fraction of gauche-conformations in polymethylene fragments. GC data shows the similarity of Turija-sever oils in thermal maturity, corresponding to to the early stage of liquid hydrocarbon generation and revealing a mixed aquatic-terrigenous origin of the precursor organic matter (OM) generated in a transitional reducing to weakly oxidizing depositional environment. In view of a significant correlation revealed between the alkane branching and the geochemistry, the samples were readily divided into two groups. Specifically, oils of Group I have a higher contribution of algae to the precursor OM and were generated under more reducing conditions than oils of Group II. The obtained data demonstrates in practice the advantage of the GC-IR combination to explain the structural and geochemical properties of sedimentary OM.



中文翻译:

以塞尔维亚潘诺尼亚盆地 Turija-Sever 油田为例, 脂肪族基团的拉伸振动与同一成因类型原油的结构和地球化学性质的相关性

摘要

该论文描述了对来自塞尔维亚东南部潘诺尼亚盆地 Turija-sever 油田的遗传相似原油的结构和地球化学特性的调查。来自 56 口井的样品通过红外光谱 (IR) 和气相色谱 (GC) 进行了检查。2800-3000 cm -1的红外光谱区域由洛伦兹函数的总和建模,以揭示脂肪族伸缩振动的贡献,从中评估烷烃支化因子。由于脂肪链支化,CH 2吸收峰在从最少支化到最多支化的油样品时向高频移动了 3–4 cm –1。这与gauche分数的增加有关- 多亚甲基片段的构象。GC 数据显示 Turija-sever 油在热成熟度方面的相似性,对应于液态烃生成的早期阶段,并揭示了在过渡还原到弱氧化沉积环境中生成的前体有机物 (OM) 的混合水陆源. 鉴于烷烃支化与地球化学之间的显着相关性,样品很容易分为两组。具体而言,I 组油对前体 OM 具有更高的藻类贡献,并且在比 II 组油更多的还原条件下生成。获得的数据在实践中证明了 GC-IR 组合在解释沉积 OM 的结构和地球化学性质方面的优势。

更新日期:2021-09-10
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