Sedimentary Microfacies And Of High-quality Reservoirs Prediction In The ? Oil Group Of The Member Of East 1,Nanpu 2-1 Block

NP2-1 block is located in the NO.2 structure in the Nanpu Depression,Bohai Bay Basin.The eastern section of the main oil-bearing strata is braided river delta deposits.The sand bodies of the reservoir change rapidly in the lateral direction and the heterogeneity is strong,which seriously affected the oilfield Water injection development effect.Taking the Ed₁?oil group in NP2-1 block as example,this paper comprehensively applies the core,logging,3D seismic and production dynamic data to carry out research on reservoir sedimentary microfacies and high-quality reservoir distribution prediction to optimize the oilfield adjustment plan and to improve the development effect of the oilfield.The thesis is guided by theories of high-resolution sequence stratigraphy and sedimentology.Based on the interface response and sedimentary evolution,the combination of well-seisms divides the Ed1?oil group in NP2-1 block into 3 medium-term cycles,10 short-term cycles,and 22 The ultra-short-term cycle established a high-resolution sequence stratigraphic framework for the target layer.Based on the lithology,sedimentary structure,grain size,and logging curve morphology,it was determined that Ed₁?was mainly deposited in the braided river delta front,Single well facies evaluations for all wells in the work area have been completed.Under the guidance of seismic attribute slicing,the profile and plane distribution of sedimentary microfacies in the reservoir have been predicted.Based on the research on reservoir macro-heterogeneity,the classification of reservoirs was evaluated using the flow unit method,and the spatial distribution of high-quality reservoirs was predicted.The research shows that the Ed₁?oil group in the NP2-1 block is mainly deposited in the braided river delta,and the development of sedimentary reservoirs in different sequence stratigraphic units has good inheritance.The body is superimposed to form a composite sand body,which has a variety of structural styles such as cut,juxtaposition,and isolation on the cross section.It is propelled to the lake basin in a fan shape on the plane.The continuous distribution of the underwater diversion channel and the estuary dam constitutes the main reservoir facies belt of the Ed₁?oil group in NP2-1 block.The reservoirs of the Ed₁?oil group are divided into 4 types of flow units.The pore permeability characteristics of the type I flow units are POR>20%and PERM>100m D.Porosity characteristics of type?flow elements are 10%<POR<20%,50m D<PERM<100m D,and pore characteristics of type?flow elements are 1%<POR<10%,1m D<PERM<50m D,all of which are mainly river sediments.The type IV flow unit is basically a non-reservoir.The type?and type?flow units are high-quality reservoirs of the Ed₁?oil group in the Nanpu2-1 block.The prediction of the profile and plane spatial distribution provides a direct geological basis for the optimization of the oilfield development plan and the determination of potential targets.