Architecture Analysis Of Fine Grained Sandy Braided River Reservoir In Middle Alluvial Fan And Research Of Remaining Oil Distribution Of Kongnan Area In Danggang Oilfield

The facies of Zao ⅡⅢgroup in Wangguantun Oilfield of Kongnan Area is braided river reservoir in middle alluvial fan,water energy is strong and lateral migration is frequently It leads to mutual overlay with different views of bradied channel sand bodies and mid-channel bar sand bodies.There are various interfaces inside as flow barriers although the distribution of sand bodies is contiguous.Therefore,it requires more elaborate research of braided river reservoir architecture.Taking the ZaoⅡⅢgroup of Dagang oilfield as an example,with the architectual theory of braided river sand body as a basis,with the braided river outcrop and modern sedimentary as a prototyping model.Using the core,logging and dynamic data,the architectual units of braided river reservoir in the studied area are studied.By single well recognition,even well prediction,dynamic validation,identifying the single sand body of braided river,and depicting space superimposed relationship of architectual unit between the mid-channel bar sand body and the braided channel sand body.Summarizing the single genetic sand body distribution,in the thick layer of continuous sand body,as a result of the existence of architecture interface,sand body space superimposed relationships are divided into three types as fully connected type,half connected type and disconnected type.The vertical superpositions of single sand bodies are divided into isolation type,superimpose type and undercut type Study the effect of sand body distribution to oil and water movement,and sum up the patterns of the remaining oil enrichment under the impact of the interfaces between single genetic sand bodies.