Abstract

A comparative study of the microelemental composition of extracts and asphaltenes from high-carbon carbonate–silica rocks of Domanik sediments of the Romashkino, Pervomaiskii, and Muslyumovo fields located in the central part, north, and east of Tatarstan was made. The rock samples studied differ from each other in the mineral composition and in the content and composition of the organic matter (OM). The composition and distribution of biogenic, rare earth, and radioactive microelements (MEs) in the extracts, asphaltenes, and carbene–carboids were studied by inductively coupled plasma mass spectrometry. With respect to the ME concentration, all the samples can be subdivided into two groups. The first group with high content of all ME groups includes samples from the Muslyumovo field and from the Sarmanovo and Berezovskaya areas of the Romashkino field, and the second group includes samples from the Pervomaiskii field and from the Chishma area of the Romashkino field. Similar subdivision of the samples into two groups is observed with respect to the content of kerogen and hydrocarbons in rocks, to the yield of extracts, and to the content of carbene–carboids in the extracts. Strong correlations were revealed between the concentration of biogenic MEs in the extracts and asphaltene content of the extracts (R² = 0.70) and between the content of rare earth and radioactive MEs, on the one hand, and resin content of the extracts and calcite content of the rocks, on the other hand (R² = 0.73). No correlation with the OM content was revealed. The extracts and asphaltenes significantly differ in the ME distribution. The Domanik rocks from the examined fields differ in the ME content, which may be due to different sources of the ME supply into these formations, including supply with fluids flowing up from the depth.

中文翻译：

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鞑靼斯坦高碳 Domanik 沉积岩中石油提取物和沥青质的微量元素组成

摘要

对位于鞑靼斯坦中部、北部和东部的 Romashkino、Pervomaiskii 和 Muslyumovo 油田的 Domanik 沉积物的高碳碳酸盐-二氧化硅岩石的提取物和沥青质的微量元素组成进行了比较研究。所研究的岩石样品在矿物成分以及有机物 (OM) 的含量和组成方面各不相同。通过电感耦合等离子体质谱法研究了提取物、沥青质和卡宾-碳化物中生物、稀土和放射性微量元素 (ME) 的组成和分布。就ME浓度而言，所有样本都可以细分为两组。所有 ME 组含量较高的第一组包括来自 Muslyumovo 油田和 Romashkino 油田的 Sarmanovo 和 Berezovskaya 地区的样品，第二组包括来自 Pervomaiskii 油田和 Romashkino 油田的 Chishma 地区的样品。关于岩石中干酪根和碳氢化合物的含量、提取物的产量以及提取物中卡宾-碳化物的含量，观察到类似的样品细分为两组。提取物中生物源MEs的浓度与提取物的沥青质含量之间显示出强相关性（关于岩石中干酪根和碳氢化合物的含量、提取物的产量以及提取物中卡宾-碳化物的含量，观察到类似的样品细分为两组。提取物中生物源MEs的浓度与提取物的沥青质含量之间显示出强相关性（关于岩石中干酪根和碳氢化合物的含量、提取物的产量以及提取物中卡宾-碳化物的含量，观察到类似的样品细分为两组。提取物中生物源MEs的浓度与提取物的沥青质含量之间显示出强相关性（R ² = 0.70），一方面是稀土和放射性微量元素的含量，另一方面是提取物的树脂含量和岩石的方解石含量（R ² = 0.73）。没有发现与 OM 内容的相关性。提取物和沥青质在 ME 分布上显着不同。来自被检查油田的 Domanik 岩石的 ME 含量不同，这可能是由于 ME 供应到这些地层的来源不同，包括供应从深处向上流动的流体。