3) the strong plastic flow prevents from damages of tectonic compression to subsalt structural traps, and helps preservation of large traps and dependence of gypsum-salt zone on the traps.

• 三是膏盐层塑性流动性避免了构造挤压对盐下构造圈闭的破坏作用，大型圈闭得以保存，膏盐层聚集区与大型构造圈闭互为依存。