Identification And Water Flooding Characteristics Analysis Of Thin Sand Single Sand Bodies In The Outer Front Of Delta Of Sa ? And ? Reservoir Groups In The East Area Of Xing 10 Area,Daqing Oilfield

In view of the fact that the inter-well sand body prediction was only emphasized in the past and the contact relationship between different types of sand bodies was not well understood,the research on single sand body connection relationship identification technology was carried out in the 13 th five-year plan to identify the contact relationship between sand bodies and find the potential for injection-production adjustment.Compared with the river sand which has been developed seriously,most of the thin sand studied in this paper is still in the original state,with low water flooding degree,thin thickness and low sand body drilling rate,which is the main reservoir type studied in the oilfield and the main part of tapping the potential.Aiming at the contrast problems of " thin thickness,small sand body scale,similar vertical sedimentary environment,lack of standard layer and marker layer in Putaohua oil layer formation",the separability of vertical sand body is analyzed under the guidance of sedimentology and stratigraphy and comprehensive logging data,and the original 72 small layers are further subdivided into 77 sedimentary time units.Based on the observation of coring wells and the corresponding relationship between lithology and electrical property,15 sedimentary microfacies patterns are established in this area.According to the different genesis patterns,the thin sand in the east of Xing Ten district is divided into 6 sand body genesis patterns including residual underwater channel type,river control intermittent strip type,river control wave control transition type,far sand dam type,offshore dam type and stable external reservoir type.The 77 sedimentary time units in the study area are classified to form the classification standard for judging the genesis pattern of thin sand in Xing Ten district,and the genesis pattern of offshore dam is considered separately,and a separate offshore dam is established Through the study of typical target layer,the contact relationship between sand bodies is divided into three categories: non-contact and non-connection between thin sand bodies,contact and connection between thin sand bodies and contact within thin sand bodies.the vertical sand bodies are divided into small layers due to non-contact between layers or layer difference between sand bodies,so that the connection relationship between sand bodies is clearer.According to the genetic model of thin sand,16 contact types are subdivided into five subclasses on the basis of three types of connectivity.According to the statistics of 118 sedimentary units and 61 sedimentary units of effective thin layer sand in three core wells X10-3-JSP3033,X11-2-JP3532,X12-1-JP 2833,the connectivity of thin layer sand in delta front zone is divided into five grades(excellent,good,medium,poor,non-connectivity)according to microfacies type,contact relationship,sandstone/effective thickness,sand-ground ratio,porosity,permeability,flooding and other parameters,forming a set of criteria for evaluating the connectivity of thin layer sand in apricot Ten areas.The water flooding analysis is carried out on the thin sand of the main target layer of six causes,and the potential tapping of the remaining oil is finally guided.