Method for evaluating fracturing effects by analyzing tracers in multi-section fracturing flow-back fluid

The invention provides a method for evaluating fracturing effects by analyzing tracers in a multi-section fracturing flow-back fluid. The method comprises the steps of sampling in an oil producing well and treating the sample, detecting the concentration of each tracer in the treated flow-back fracturing fluid, and evaluating the fracturing effect of each layer according to the concentrations of the tracers. The fracturing conditions judged by use of the method are visual and accurate, quantitative and low in error, and have an important guiding effect on the fracturing of the sections of the same layer; the design scheme is optimized for the conditions of different stratums; as a result, the fracturing efficiency is improved and the cost is reduced.