Application of Depositional Facies Control on Geological Modeling——Taking the Chang 2 Group of Ansai Oilfield in 152 area as an example

Aim Reservoir modeling technology controlled by sedimentary facies is a practical new technology which can improve the accuracy of geological modeling greatly.The key point is to establish an accurate digital model for spatial distribution of reservoir depositional micro-facies.Furthermore,to simulate the spatial distribution patterns of reservoir parameters,laying a solid foundation for reservoir simulation and remaining oil prediction.Methods modeling for fluvial facies reservoir of the Chang 2 group,Yanchang Formation of the upper triassic in Ordos basin constrained by the temporal and spatial distribution of depositional facies is studied in this paper.On the basis of the depositional facies model constructed by toughly consideration of the facies formation and origin,based upon application of multi-parameter coordination and on different level constraint approach.Results show that reservoir model controlled by depositional facies can truly reflect heterogeneity of the reservoir characteristics and connectivity of the sand bodies.Furthermore,depositional facies controlled reservoir model can simulate underground distribution of hydrocarbon-bearing reservoir properties more accurately and precisely,at the same time,it can provide a reliable basis for oil-pool digital simulation,residual oil prediction,adjustment and exploitation.