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Groundwater baseline water quality in a shale gas exploration site and fracturing fluid-shale rock interaction

Fig. 2 The shallow groundwater chemical composition

At present, the baseline water quality must be firstly obtained to identify potential pollution of the activity and monitoring indicators should be studied for better environmental monitoring. We sampled shallow groundwater, produced waters, shale rock and soil in the Jiaoshiba shale-gas region, SW China and measurements have included water chemistry

Removal of organic compounds from shale gas flowback water

Fig. 1. Fractions of TOC (A) and molecular composition of LMW acid (B) and LMW neutral (C) fractions of the shale gas flowback water.

Abstract Ozonation, sorption to granular activated carbon and aerobic degradation were compared as potential treatment methods for removal of dissolved organic carbon (DOC) fractions and selected organic compounds from shale gas flowback water after pre-treatment in dissolved air flotation unit. Flowback water was characterised by high chemical oxygen demand and DOC.

Thermogravimetry as a tool for measuring of fracturing fluid absorption in shales

Fig. 6 Comparison of absorbance capacity of the examined samples. Explanations: 0—blank test—fresh sample, W—distilled water saturated, F—the same sample saturated with fracturing fluid, F2—fresh sample saturated with fracturing fluid

In case of rocks which are drilled from the borehole, obtaining such large samples is very difficult; therefore, an attempt was made to determine the rock absorption on small samples, using the TG analysis. Thermogravimetric (TG/DTG) experiments were conducted in temperature range 40–300 °C in synthetic air environment. Shale rock