Qualitative and quantitative detection method for tiny leakage of hidden oil storage tank

The invention discloses a qualitative and quantitative detection method for tiny leakage of a hidden oil storage tank. The qualitative and quantitative detection method for the tiny leakage of the hidden oil storage tank is characterized by aiming at three states of leakage, no leakage or indeterminate leakage of the hidden oil storage tank, and using a decision function of qualitative detection for the tiny leakage to give a detection result based on a double-statistic calculation result; if the detection result is leakage, a tiny leakage initial alarm is extracted and sample data during the alarm period are confirmed to carry out backward differential filtering on the sample data during the alarm period so as to obtain backward differential ascending sequence data required by quantitative detection for the tiny leakage, and an estimation model of the quantitative detection for the tiny leakage is adopted to estimate the leakage rate, leakage flow and leakage time. The method solves the problem of difficulti