Macroscopic heterogeneity of the Yan 10 reservoir in Beisan area,Maling oilfield

In Yan 10 reservoir from Beisan area of Maling oilfield,parallel bedding,cross bedding and oblique bedding were mainly developed and the multi periods positive rhythm superposition was the main characteristics.From top to bottom,the sedimentary facies were from meandering to braided river facies transition,and the reservoir heterogeneity was enhanced.It was predicted the braided river changed more frequently than meandering river and the deposition was more complicated.Laterally,the heterogeneity degree in the study area was strong,which would greatly affect the actual production of oilfield.