Abstract

The composition of hydrocarbons (HCs) generated in the course of transformation of the organic matter (OM) of domanik rocks from high-carbon siliceous–carbonate–clay deposits of the Romashkino (С_оrg 7.07%) and Taveli (С_оrg 1.90%) fields and from low-carbon carbonate deposits of the Bavly field (С_оrg 0.33%) in supercritical water (SCW) at 374°С and pressures of up to 24.6 MPa was determined. The rock samples differ in the mineral composition, OM (including kerogen) content, and composition of bituminoids being recovered. The effect of SCW on the degradation of the polymer structure of kerogen and high-molecular-mass bituminous components of domanik rocks of different lithological and facial types with the formation of petroleum fractions was demonstrated. The content of saturated HCs in extracts from high-carbon rocks of the Romashkino and Taveli fields increases after the treatment in SCW, whereas the content of aromatic compounds, resins, and asphaltenes decreases. The fraction of resins in the extract from the carbonate low-carbon rocks of the Bavly field, transformed under similar conditions, appreciably increases, whereas the content of saturated and aromatic HCs and of asphaltenes decreases. The extract from the rock of the Romashkino field, characterized by the highest content of OM and kerogen, contains, along with liquid fractions, also solid substances of carbene/carboid type. The content of n-alkanes and isoprenoids in the saturated fractions increases irrespective of the type of domanik rocks, whereas the content of polycyclic steranes, triterpanes, arylisoprenoids, and monoaromatic steroids decreases. A common trend is observed for aromatic fractions: the content of dibenzothiophenes and phenanthrenes increases, whereas the content of arylisoprenoids, naphthalenes, and benzothiophenes decreases. The main differences in the composition of HC fractions generated from rocks of different types are manifested in the molecular-mass distribution of n-alkanes С₁₀–С₃₆. The role of SCW in the formation of HC (СH₄, C₂H₄, C₂H₆, C₃H₈, n-C₄H₁₀, and n-C₅H₁₂) and inorganic (H₂, O₂, and CO₂) gases was demonstrated. The yield and composition of the gases, as well as of С₁₀–С₃₆ HC fractions, depend on the mineral composition of the rocks, on the content and composition of OM in the rocks, and on the heat resistance of the OM in SCW medium.

中文翻译：

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鞑靼斯坦多马尼克矿床岩石有机质在超临界水中转化形成产物的烃类成分

摘要

_{Romashkino ( Соrg} 7.07%) 和 Taveli ( _Соrg 1.90%)的高碳硅质-碳酸盐-粘土矿床在 domanik 岩石的有机质 (OM) 转化过程中产生的碳氢化合物 ( HCs) 的组成油田和 Bavly 油田的低碳碳酸盐矿床 ( _Соrg0.33%) 在 374°С 和高达 24.6 MPa 压力下的超临界水 (SCW) 中测定。岩石样品的矿物成分、有机质（包括干酪根）含量和回收的类沥青的成分不同。论证了 SCW 对不同岩性和面部类型的多马尼克岩石的干酪根聚合物结构和高分子量沥青组分的降解作用，并形成石油馏分。Romashkino 和 Taveli 油田高碳岩提取物中饱和 HCs 的含量在 SCW 处理后增加，而芳香族化合物、树脂和沥青质的含量降低。在类似条件下转化的 Bavly 油田碳酸盐低碳岩提取物中的树脂比例明显增加，而饱和和芳香烃和沥青质的含量减少。Romashkino 油田岩石的提取物，其特征是 OM 和干酪根含量最高，除了液体部分外，还含有卡宾/碳化物类型的固体物质。的内容饱和馏分中的正构烷烃和类异戊二烯增加，与多马尼克岩石类型无关，而多环甾烷、三萜烷、芳基异戊二烯和单芳香类固醇的含量减少。观察到芳烃馏分的一个共同趋势：二苯并噻吩和菲的含量增加，而芳基异戊二烯、萘和苯并噻吩的含量减少。不同类型岩石产生的 HC 组分组成的主要差异体现在正构烷烃 С ₁₀ -С ₃₆的分子量分布上。SCW 在 HC 形成中的作用 (СH ₄ , C ₂ H ₄ , C ₂ H ₆、C ₃ H ₈、n -C ₄ H ₁₀和n -C ₅ H ₁₂ )和无机(H ₂、O ₂和CO ₂ )气体。气体以及 С ₁₀ –С ₃₆ HC 馏分的产量和组成取决于岩石的矿物组成、岩石中 OM 的含量和组成以及 SCW 中 OM 的耐热性中等的。