Abstract
QJ depression is situated in one of the typical block salt-lake basins in the east of China. Based on the seismic and well data obtained from QJ depression, the seismic-geological characteristics of the salt-structures of QJ formation, the mechanisms of their forming, the laws of their distribution and the conditions of the oil/gas bearings were discussed and described by the authors. From the viewpoint of "grasping a typical example and you will grasp the whole category", the article might be some use for those who are facing similar situations and problems.