Injection profile logging system and method based on optical fiber distributed temperature measurement technology

The invention relates to the technical field of oil field logging, in particular to an injection profile logging system and method based on an optical fiber distributed temperature measurement technology. The system comprises an optical fiber full-well-section temperature measurement demodulation system, a photoelectric composite cable and a heater, the heater can heat injected liquid to form high-temperature slug fluid underground, and the high-temperature slug fluid passes through a first temperature measuring section and a second temperature measuring section which are preset underground; collecting a first high-temperature peak value, a first position point and a first time point in the first temperature measurement section; collecting a second high-temperature peak value, a second position point and a second time point in a second temperature measurement section; and calculating the migration velocity of the fluid between the two temperature measurement sections in the well so as to calculate the flow. A