Abstract：Bedded salt deposit is originated from cyclical sedimentation of salt rock and mudstone，anhydrite，or other non-salt rock interlayers；and the physico-mechanical properties determine limit operation pressure of gas deposit to some degree. The authors investigated the penetrability of salt rock and the interlayers；and it was pointed out that the naturally compacted salt rock and interlayers would not affect the safety of the gas storage，provided that they were not damaged. Then，some experimental investigations and theoretical analyses of mechanical and rheological properties of salt rock and the interlayers were carried out. It was concluded that the difference of mechanical properties between salt rock and interlayers could be found with some deformation variances of different lithologies and even shear damage on their interfaces. On the basis of the above studies，a set of laws were proposed for determining the minimum and the maximum operation pressures in bedded salt rock gas storage，including roof stability law，creep control law，cavern wall and naked well tightness law. Finally，an in-situ example for determining the limit operation pressure was analyzed with the given laws. The results are able to guide the construction and operation of the oil and gas deposits in bedded salt rock in China.
