关键词: 柴达木盆地, 构造带, 生储盖组合, 含油气远景

Abstract: Tsaidam Basin is quite a large sedimentary basin in Western China.However,the oil and gas reserves discovered there are far from satisfactory in consideration of the basin area and the amount of its oil and gas resources.The prerquisite for making breakthroughs in exploration is finding out the geological laws governing the formation of large-scale oil/gas fields.Several oil/gas-bearing structures have been located in Lenghu-Nanbaxian structure belt during prospecting in northern part of Tsaidam Basin in recent years.Meanwhile well LK-1,one of our scientific exploration wells,penetrated Jurassic source rock as thick as some thousand meters.All these indicate that favorable conditions exist for the formation of large-scale oil/gas fields.In the present paper the authors analyzed SRI of Jurassic source rock,the characteristics of reservoir rock and caprock,the association of reservoir,caprock and the features of oil pools.In combination with the recent exploration achievements,it has been concluded that a large amount of oil/gas accumulation probably exist in Lenghu -Nanbaxian structure belt.In addition,based on the geological conditions and the characteristics of the structural traps,the targets for the near-future exploration activities are proposed by the authors.

Key words: Tsaidam Basin, structure belt, petroliferous prospect