Numerical investigation of the influence of underground water injection on the groundwater system in a shale gas reservoir in southwestern China

Yin, Wenjie; Hu, Litang; Yao, Lili; Teng, Yanguo

doi:10.1007/s12665-016-5889-6

Cited by 2 publications

(2 citation statements)

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“…Meanwhile, approximately 70~80% of produced water from shale oil and gas production in the Permian Basin in the United States is disposed of in subsurface geological units [10]. Although underground injection has been proven to be an effective disposal method, environmental risks such as shallow groundwater contamination still exist because of the complex geological conditions [14][15][16][17]. To ensure security, the environmental risk analyses of produced water reinjection have led to numerous investigations.…”

Section: Introductionmentioning

confidence: 99%

“…To ensure security, the environmental risk analyses of produced water reinjection have led to numerous investigations. For example, Yin et al established a regional hydrogeological model and then conducted a numerical modeling investigation to analyze the influences of the reinjection of produced water on the groundwater system [14]. Huang et al proposed a framework to determine inorganic monitoring indicators for identifying groundwater contamination by produced water [15].…”

Section: Introductionmentioning

confidence: 99%

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The Sorption Behaviors of Barium during Reinjection of Gas Field Produced Water into Sandstone Reservoir: An Experimental Water-Rock Interaction Study

et al. 2023

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Identifying the fate of contaminants (such as barium) during gas field produced water reinjection could be a feasible method to evaluate the environmental risks of the reinjection project and thus improve its sustainability. To assess the barium sorption behaviors during gas field produced water reinjected into sandstone reservoirs, a series of water–rock interactions experiments were conducted to systematically investigate the effects of brine/rock ratio (5:1~500:1), pH (3~10), temperature (20, 50 and 80 °C), brine salinity (NaCl solution, 0~100 g/L), competitive cations (Sr and Mg, 0.5 g/L), and organic compound (methanol, 0~5 g/L) on the sorption of barium in sandstone. The rock samples were collected from the Triassic formation of the Yanchang Group in the northern Ordos Basin, China. The results indicated that the sorption of barium in sandstone strongly depends on the brine/rock ratio. Under the same brine/rock ratio, the severity of the impact on the barium sorption from high to low was competitive cation, salinity, pH, temperature, and methanol concentration. The sorption process of barium onto the sandstone could be well fitted by a pseudo-second-order kinetics model. The presence of competitive cations would restrain the sorption of barium, while the existence of methanol hardly affects the barium sorption. The chloro-complexation reaction and the reduction of rock surface electrical potential are mainly responsible for the inhibition effects of NaCl salinity on barium sorption, and the corresponding relationship can be characterized by an exponential function. Barium sorption in sandstone decreases with increasing temperature, while it is positively correlated to the initial pH of the solution. The water-rock system is weakly alkaline with a value of 7.7–8.5 when the barium sorption reaches an equilibrium state, regardless of the initial pH of the reactive solution. The results are meaningful in understanding and predicting the fate of barium after the gas field produced water was reinjected into the underground.

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