Study On Geological Modelling Of Kongyi Member In Wangguantun Area,Huanghua Depression

Guan80 and Guan 29 fault block in Wangguantun Region in Dagang Oilfield located in two sides of Kongdong Fault Zone in the Huanghua Sag.Through decades of rapid development,the complex fault block has experienced complex structure and fault development,which resulted in high reservoir producing,moisture content more than 90%,so it is essential to carry out fine geology research and build 3D geological model in order to provide accurate reservoir geological model for numerical reservoir simulation,make step for the development of reservoir development countermeasures,and provide basis for specific adjustment development.Based on regional geological characteristics in study area and predecessors’ research results,using core,logging,drilling and logging data,the stratigraphic classification and correlation was finished and subtle stratigraphic framework was set up.According to stratigraphic division and correlation,sedimentary microfacies and the reservoir characteristics was studied.Applying the previous research,the three-dimensional reservoir geological model suited to the characteristics of study area was established by using Direct modeling software.According to the research,mainly concluded the following results:(1)By using "well-seismic combination,cycle comparison-hierarchical control,sedimentary facies constraint,three-dimensional closure",realized fine stratigraphic correlation of Guan 29 and Guan 80 fault block including mudstone.The main oil-bearing layer of Guan 80 fault block--ZaoⅠ,ZaoⅡ,Zao Ⅲ oil group were divided into 9 layers and 30 single sand body,Guan 29 fault block were divided into 10 layers and 34 single sand body.(2)ZaoⅠ,ZaoⅡ,Zao Ⅲ oil group of Guan 29 and Guan 80 fault block are mainly braided river sedimentary in the mountain alluvial fan.The river channel sand main body include strip and flake distribution pattern with sand body width generally 100m-400 m,width can reach more than 600 m.(3)The facies difference of Guan 29 and Guan 80 fault block caused strong plane heterogeneity of reservoir;Within the same facies belt,heterogeneity is weak;intercalation distribution in diara is the most important factor of heterogeneity.The study of remaining-oil distribution under control of diara interlayer internal is the key point in mid and late development;By analyzing the study area from parallel and vertical to flow direction,we found that along the palaeocurrent direction,single body of the profile vertically overlapping,the same intercalation nearly horizontal distributed in central,two sides bent to the central of diara,intercalation laterally distributed.In profile vertical to palaeocurrent direction,single body vertical accreted,the same intercalation nearly horizontal distributed in central,two sides bent to the central of diara.(4)The established structure model,sedimentary model and reservoir parameter distribution model can reflect the real geological characteristics in the study area,to provide geological evidence for later adjustment and tapping of the remaining oil.