Study On Reservoir Description And Redevelopment Of Du48Block

Du48block is located7km southwest of Shuguang oil production factory,and theDujiatai oil-bearing layer of member4of Shahejie formation is the target developingstratum,which is a classic interlayered heavy oil reservoir.Dujiatai oil-bearing layer has been developed effectively in the past20years,but withrelative low recovery ratio. To this end, the research is carried out to improve the ultimaterecovery in this block.Reservoir description and redevelopment are the major research contents in this article.Specifically, sedimentary microfacies research controlled by single well face study andlogging face study is the leading method by using sedimentary and seismic interpretationtechnology on the basis of coring, drilling and seismic. Residual oil distribution feature isanalyzed based on primary development history evaluation, and the horizontal wellapplication possibility and development style changing potential are evaluated,finally putforward the technical feasibility of changing the development style at appropriate positionand partially implementing horizontal wells.The research shows that tectonic pattern of Du48block is relative simple, generallydeveloped the fault-anticline structure pitching to outside directions under the background ofsloping, with2secondary stage blocks divided by4faults. Generally,reservoir sand stripdistributed from west-north direction to east-south direction,the source area is from thewest-north direction.Oil-bearing layer distribution is major controlled by structure,is thethin-medium interlayered lithology structure reservoir. The remaining reserves are rich andMainly located in the of reservoir group Du0and DuI and DuII,Especially in the middle ofwells and the edge of reservoir.It is analyzed that can be Potentialed by horizontal wells andfire drive.For the similar reservoirs,the research in this article could supply the technicalfoundation for the reservoir simulation,redevelopment style selection.