Method for detecting water tightness of existing salt cavern cavity

The invention discloses a water tightness detection method for an existing salt cavern cavity. The method comprises the following steps: 1, measuring an initial pressure value of a salt cavern wellhead; 2, discharging brine in the salt cavern; and 3, judging the water tightness of the salt cavern. According to the method, the brine in the existing salt cavern is discharged, and the initial pressure value of the wellhead of the existing salt cavern, the pressure value of the wellhead of the existing salt cavern in the brine discharging process and the volume of the discharged brine are recorded, so that rapid detection of the water tightness of the existing salt cavern is realized through calculation and comparison; the method is especially suitable for carrying out preliminary detection on the existing salt cavern which is not used for a long time, is convenient for judging whether the existing salt cavern can be subjected to subsequent air tightness transformation or not, and is simple and convenient in dete