Abstract: The thick Neogene salt layer developed in the Eastern part of Qiulitage Belt, through the representative seismic profiles, it is reveled that the salt layer is a decollement layer and adjustes the differentiated deformation between the supra salt layer and the sub salt layers, the structural traps in the supra salt layer are mainly anticline trap, thrust fault sheltering trap, etc, the traps in the salt layer are mainly the lithostratigraphic trap or the anticline trap constituted of the carbonate rock and the sandstone, the structural traps in the sub salt layer are mainly the pop up etc. Combining this result with analyzing of the condition of the hydrocarbon accumulation, the authors consider there is the accumulation pattern of separated source side rejecting in the area with a transporting layer composed of faults and unconformities, there is a good relationship between the evolution history of the source rock in Yangxia Sag and the structural deformation, all these make the structural traps in the studied area capture the natural gas generated in Yangxia Sag.

Key words: salt related structural trap, salt layer, hydrocarbon accumulation pattern, eastern Qiulitage structural belt, Tarim Basin