Research On Reservoir Characteristics Of Guantao Formation In Nanpu 2-3 Area

Nanpu oilfield No.2 structure is in the south of Nanpu Sag,based on Nanpu No.2 fault line,Nanpu No.2 structure west can be divided into two areas.The upthrown side becomes Nanpu 2-1 area,the thrown side becomes Nanpu 2-3 area,the study in the work area mainly for 2-3 area.After recent years of oilfield development,Nanpu 2-3 area exposed many geological understanding problems,mainly including the lateral lithofacies changes greatly,and reservoir heterogeneity is strong,oilfield development effect is severely affected.This study through the comprehensive utilization the data of geological,well logging,seismic,core slice,and the research achievements of predecessors,combined with regional geological background,to establish a high precision stratigraphic isochronous framework,and to achieve stratification reunification in Nanpu 2-3 area.Guantao formation is divided into 2 long-term cycles,4 medium-term cycles,21 short-term cycles,a set of igneous rock formation and a set of basal conglomerate deposits.Guantao formation corresponds to be divided into 4 oil groups,6 sand groups,and 23 single layers.On the basis of single layer division and contrast,starting from the core description,by single well microfacies classification,in combination with seismic attribute analysis,to carry out the division and analysis of plane microfacies,has been predicted the distribution characteristics of reservoir sedimentary microfacies in Nanpu 2-3 area.In Ng?3,Ng?1,and Ng?(1)2 single layers sedimentary period,are mainly developed braided channel and diara sedimentary microfacies.From Ng?(1)2 to Ng?3 period,diara quantity increase gradually,sand body scale increase.According to core observation and particle size analysis,to carry out the basic characteristics of the reservoir,including the petrology characteristics,physical characteristics and pore throat analysis and so on.The macroscopic heterogeneity of the reservoir is analyzed,the reservoir of Guantao formation is classified and evaluated in Nanpu 2-3 area,determine the favorable reservoir facies belt,for the adjustment of the reservoir development program and rolling to provide geological basis.Overall,the reservoir sand bodies of Guantao formation in Nanpu 2-3 area are mainly developed by the first type reservoir and the second type reservoir.