Sedimentary Facies Distribution and Lithologic Traps Recognition of J_1s_2~1 Formation in the Area of Shinan,Junggar Basin

The area of Shinan is located in the Central Junggar basin,the J1s12 formation is the favorable bed for lithologic traps prospecting and belongs to the transgressive systems tract,with lots of sand body and a good assemblage of reservoir and cap rocks.Base on the well logging and seismic data,this paper studied the delicate sedimentary facies of the J1s12 formation using various sedimentation parameters,analyzed the main control factors for forming lithologic traps,and predicted the favorable zones for prospecting.It also takes the lithologic trap of Xiayan 3 well as an example to assess the assemblage of reservoir and cap rocks and the pay condition.