Research On Reservoir Geological Characteristics And Development Scheme Adjustment Of Es₃² In Niu 23-A Block Of Niuzhuang Oil Field

Base on the stratigraphic correlation and small layer division, the construction,reservoirs and other petrolume geology characteristics of middle Es3 of niu23-A block in niuzhuang oil field have been analyzed using well testing, well logging, drilling,seismic, and analysis assay data. And then the develop plan have been redesigned based on analysis of above.According to the integrated analyses of well logging and seismic data, the formati on of middle Es3 can be divided into four small layer :niu23-40,niu23-A01,niu23-A,niu23-A1. And these four layers has been further devided seventeen sandbodys. The structural shape of the purpose formation is southwest high and southwest low, the nor thwest formation dip is steep,but central and eastern is relatively flat.In the study area, the overall sedimentary characteristics is mud packing sand, the color of the mudstone with horizontal bedding is dark; Structure maturity and composition maturity of the sandstone are medium to low. The sandstone and the underground mudstone is mutations in touch, where we can see massive bedding, graded bedding and stir slump deformation structures and biological structure which are turbidity deposits in semi-deep lake. In the vertical, the sand body is superposed by multiple phases, and in the plane, the sandbodies migrate from east to west bottom up. The single sandbody is small and sporadically distributed.The type of reservoir belongs to lithologic reservoir characterized by medium pore,low-permeability,normal temperature and abnormal overpressure. Oil layer N23-A01-1 and N23-A-2 distribute in sheet shape in the plane. As a contract,other oil layers are in scattered p attern. Petrel is applied to build three-dimensional geological model of structure and reservoir of the target intervals in study area.vertically,flooding level in the top of sand body is relatively low, in the flat,N23-A01-1、N23-A-2 sand body tie tegother, remain SATO is high.according to the characteristics of the distribution of remaining oil and the analysis of the current injection-production pattern, 3 sets of adjustment schemes are designed. First: 470 m well spacing*270 m row spacing, rectangular inverted nine-spot vertical wells project;second: 570 m well spacing*270 m row spacing, rectangular inverted nine-spot vertical wells project;last:670 m well spacing*270 m row spacing, rectangular inverted nine-spot vertical wells project.