Method for quickly identifying water flooded layer and judging water flooding level based on carbon-oxygen ratio logging

The invention provides a method for quickly identifying a water flooded layer and judging a water flooding level based on carbon-oxygen ratio logging. Comprising the following steps: step 1, determining formation porosity; 2, calculating a theoretical waterline; 3, calculating a theoretical oil line; 4, quickly and qualitatively identifying the water flooded layer; and step 5, establishing a flooding level identification chart. According to the method, the water flooded layer can be rapidly and qualitatively identified through same-scale overlapping display of the oil line, the water line and the carbon-oxygen ratio curve, the influence of lithology and porosity change on the carbon-oxygen ratio logging value is eliminated by constructing the water flooding level identification factor, the fluid response characteristics are highlighted, the water flooding level judgment accuracy is higher, the universality is high, and the method is suitable for popularization and application. The method can be applied to dat