The Reservoir Characteristics And Dominant Migration Channels' Distribution Of Donghe Sandstone In Hudson Oilfield

The Donghe sandstone reservoir in Hudson Oilfield is the first million-ton of marine sandstone reservoirs in China.The reservoir thickness is less than 30 meters and the depth is more than 5000 meters.Currently the reservoir is at middle-late stage of development,comprehensive water content is up to 82.4%.At the same time,the distribution of seepage barrier in the study area is complicated,which makes the reservoir heterogeneity strong.dominant migration channels have formed in some area,showing inefficient water cycle.In view of this problem,the basic characteristics of the reservoir are studied through core analysis.After flooded,the physical properties of reservoir achieve the best at the middle stage of flooding.When the throat radius is greater than 5?m,its proportion continues to increase.The proportion of medium-large hole with medium throat radius is obviously increased,and it's easy to form the dominant channel.Based on the analysis of core,logging and dynamics,the types of seepage barrier were classified as primary,secondary and mixed.The distribution of the seepage barrier is predicted by matching of the vertical-horizontal well seepage barrier.And the interwells connectivity is analyzed by dynamic data.The formation mechanism and type of reservoir dominant channel are clarified,and the identification criteria are established in combination with static geological factors and production dynamic factors.The prediction about dominant migration channels of longitudinal distribution and the plane distribution are carried out.It mainly distributes in the 1,2 layers and concentrated in the central area.The study can be a credible reference for the governance of dominant migration channels and adjustment of injectionproduction well pattern.