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Multistage hydraulic fracturing is an important way to stimulate the tight oil and gas reservoir. Due to the number of stages and anisotropy of the long horizontal section, the flowback of each stage is important for the evaluation of the fracturing effect and the next well location deployment. At present, microseismic monitoring technology is a popular evaluation method, it can display the morphology and growth of fractures, but some other technologies are needed to analyze the flowback andfatcat:qznfc5tcvrfnlmu3qvt5t4ikbi