Abstract—

The results of experimental studies of the macrocomponent and microcomponent compositions of pore solutions in the bituminous siliceous shales of the Bazhenov Formation (BF) in Western Siberia with total organic carbon (TOC) contents up to 12.63% (“normal rocks”) and the silty sandstones of the “anomalous” section of the BF with TOC contents no higher than 0.63% (“anomalous” rocks) are presented. The studies of water extracts from core samples were performed. It was found that the pore solutions in the rocks of the “normal” BF rocks are sodium sulfate–bicarbonate, whereas the solutions in the “anomalous” rocks are sodium bicarbonate–chloride. The following tendencies were noted in the pore solutions of both “normal” and “anomalous” rocks compared with the oceanic water: (a) increase in Mn, Co, Ni, Cu, Zn, Mo, Sb, Cd, Ba, V, and Cr concentrations to varying degrees; (b) elevated Cs, Pb, and Ti concentrations in pore solutions of “anomalous” rocks only; (c) reduced Li, B, Rb, and Sr concentrations. A direct correlation between Li, B, Ba, Sr, U, Mo, Cd, Sb, and Ni concentrations in the pore water and total organic carbon (TOC) contents in the rocks was established. The concentrations of V, Cs, Sb, Rb, Ti, and Mn in pore waters display a close to inverse correlation with TOC content in rocks. The content of Ba in the pore solutions of the “normal” BF rocks equals or exceeds the Sr content, which is abnormal compared with formation water in most oil fields and with ocean water and is attributable to the specific features of organic-rich mudstone accumulation, considering that the Sr content in the “anomalous” rocks of the BF is two times higher than the Ba content, which is closer to their usual ratios in most natural waters.

中文翻译：

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西西伯利亚巴珍诺夫组岩石中孔隙溶液微组分组成的特殊特征

摘要—

西伯利亚西部Bazhenov组（BF）的沥青质硅质页岩中孔隙溶液的宏观组分和微观组分组成的实验研究结果，总有机碳（TOC）含量高达12.63％（“正常岩石”）和粉质给出了高炉“异常”部分砂岩的TOC含量不高于0.63％（“异常”岩石）。对核心样品中的水提取物进行了研究。结果发现，“正常”高炉岩石中的孔隙溶液为硫酸钠-碳酸氢钠，而“异常”岩石中的溶液为碳酸氢钠-氯化钠。与海水相比，“正常”岩石和“异常”岩石的孔隙溶液中存在以下趋势：（a）Mn，Co，Ni，Cu，Zn，Mo，Sb，Cd，Ba，V的增加，铬含量不同程度；（b）仅“异常”岩石孔隙溶液中的Cs，Pb和Ti浓度升高；（c）降低Li，B，Rb和Sr的浓度。建立了孔隙水中的Li，B，Ba，Sr，U，Mo，Cd，Sb和Ni浓度与岩石中总有机碳（TOC）含量之间的直接关系。孔隙水中V，Cs，Sb，Rb，Ti和Mn的浓度与岩石中TOC含量呈近乎反相关。“正常”高炉岩石孔隙溶液中的Ba含量等于或超过Sr含量，与大多数油田的地层水和海水相比，这是不正常的，这归因于富含有机物的泥岩堆积的特殊特征。 ，考虑到高炉“异常”岩石中的Sr含量是Ba含量的两倍，