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Transformation of Carbon-Rich Organic Components of a Domanik Rock in Sub- and Supercritical Aqueous Fluids
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-06-16 , DOI: 10.1134/s0965544121060062
Z. R. Nasyrova , G. P. Kayukova , A. V. Vakhin , B. I. Gareev , A. A. Eskin

Abstract

The paper identifies major features that distinguish the transformation of organic matter (OM) of rocks in the Semiluki (Domanik) deposits into solid, liquid, and gaseous products when exposed to sub- and supercritical water under various temperature and pressure conditions. To this end, a set of modern instrumental methods were used, namely: Rock–Eval, elemental analysis, GC, GC/MS, IR spectroscopy, XRD, and ICP-MS. The degradation of high-molecular-weight bituminous components and the decomposition of kerogen affect the yield of oil extracts from the rock and increase the proportion of saturated and aromatic hydrocarbons in the extracts. In the molecular composition of the extracts, an increase is observed in the concentrations of light C11–C18 n-alkanes, C11–C12 alkyltrimethylbenzenes, naphthalenes, and phenanthrenes. Structural changes in asphaltenes are associated with an increase in their aromaticity and oxidation level, as well as with structural transformations in the vanadyl-porphyrin complexes. It was found that the oxidative degradation, desulfurization, and hydrolysis of carbon-rich components of organic matter are more vigorous in supercritical aqueous fluids than in subcritical water. In addition, a supercritical aqueous fluid promotes structural and phase transformations of rock minerals, in particular the isolation of a separate montmorillonite phase from a mica structure.



中文翻译:

Domanik 岩石富碳有机组分在亚临界和超临界水相流体中的转化

摘要

该论文确定了在不同温度和压力条件下暴露于亚临界和超临界水时,区分 Semiluki (Domanik) 沉积物中岩石有机质 (OM) 转化为固体、液体和气体产物的主要特征。为此,使用了一套现代仪器方法,即:Rock-Eval、元素分析、GC、GC/MS、IR 光谱、XRD 和 ICP-MS。高分子量沥青组分的降解和干酪根的分解影响了岩石中石油提取物的产率,并增加了提取物中饱和烃和芳烃的比例。在提取物的分子组成中,观察到轻质 C 11 –C 18 构烷烃、C11 –C 12烷基三甲基苯、萘和菲。沥青质的结构变化与其芳香性和氧化水平的增加以及氧钒-卟啉复合物的结构转变有关。结果表明,与亚临界水相比,超临界水相流体中有机物富碳组分的氧化降解、脱硫和水解更加剧烈。此外,超临界含水流体促进了岩石矿物的结构和相变,特别是从云母结构中分离出单独的蒙脱石相。

更新日期:2021-06-17
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