Analysis of the characteristics and controlling factors of the Chang 4+5 reservoir in Zhoujiawan area,Ordos Basin
In this paper,the core observation,scanning electron microscope and mercury injection test data of Chang 4+5 reservoir of Yanchang Formation in Zhoujiawan area are collected and sorted out,and the characteristics of Chang 4+5 res-ervoir and the main controlling factors affecting the reservoir characteristics are statistically analyzed from the aspects of petrolo-gy,physical properties,pore types and structural characteristics.The results show that the study area is mainly submerged di-vergent channel and submerged divergent interbay microphase in the delta front subphase;the Chang 4+5 reservoir in the area is affected by sedimentation,and the best reservoir physical properties are distributed in the submerged divergent channel sand body,and the physical characteristics are dominated by residual primary intergranular pores;influenced by diagenesis,the rocks are compacted and densified,such as chlorite early ring edge stability,pore permeability conditions are difficult to change,and later The carbonate cement reduces the primary intergranular pores and reservoir pore permeability,but partly prevents compaction by increasing the strength of skeletal particles;dissolution improves the reservoir pore permeability.The Chang 4+5 reservoir in the study area is an extra-low porosity,extra-low permeability reservoir.
controlling factorsreservoir characteristicsChang 4+5 of Yanchang FormationZhoujiawan areaOrdos Basin
NETL
NSTL
万方数据
