This study evaluated geochemistry between the Utica‐Point Pleasant shale and reservoir/hydraulic fracturing fluid mixtures under simulated reservoir conditions in a batch reactor system. Analytical techniques were utilized to monitor fluid composition with time along with pre‐ and post‐trial shale microscopy and phase identification analyses. Formation of iron‐based precipitate was evident through results from fluid and material analyses. Ferrous iron was the predominant iron form found in the aqueous phase, with oxidation to ferric iron and subsequent precipitate formation. Geochemical modeling further supported ferric iron was the favorable phase for precipitation.

中文翻译：

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Utica-Point宜人页岩与水力压裂液之间的地球化学现象

这项研究评估了在分批反应器系统中模拟储层条件下，Utica-Point宜人页岩与储层/水力压裂液混合物之间的地球化学。分析技术被用来监测流体成分随时间的变化，以及试验前和试验后的页岩显微镜和相识别分析。通过流体和材料分析的结果可以明显看出铁基沉淀物的形成。亚铁是水相中的主要铁形式，氧化为三价铁，随后形成沉淀。地球化学模型进一步支持了三价铁是沉淀的有利相。