Analysis of fracturing flowback fluids from 14 shale gas wells across 7 platforms in the Zheng'an block, Guizhou, reveals that the fluids are characterized by high salinity, elevated Na\(^+\) and Cl\(^-\) concentrations, and high levels of chemical oxygen demand (COD) and ammonia nitrogen. Na\(^+\) concentrations range from 7370 to 27396~mg/L (mean 18689~mg/L), Cl\(^-\) from 9000 to 43000~mg/L (mean 29438~mg/L), and total salinity from 17074 to 70950~mg/L (mean 48744~mg/L). The dominant microbial populations comprise iron bacteria (FEB), saprophytic bacteria (TGB), and sulfate-reducing bacteria (SRB). These characteristics indicate that the flowback fluid cannot be discharged directly withou... More >