Study On Sedimentary Facies And Reservoir Heterogeneity Of The Second Member Of Shahejie Formation In ZX149-Z 130 Blocks In Zhuangxi Oilfield

Research area is located at northeast of Zhuangxi oilfield,and near the downthrown side of Changdi Fault.In view of the lack of unity in stratigraphic division and correlation,the controversy over the types and distribution of sedimentary facies,the unclean of the reservoir heterogeneity and the lack of comprehensive evaluation of reservoir quality of the second member（E_S2）of Shahejie Formationin this area,the essay provides detailed researches on sedimentary characteristics and nonhomogeneous characteristics,as well as evaluation and prediction on quality of reservoir based on drilling,mud logging,seismic,well logging and analysis testing data.Main results and achievements are as follows:（1）As per principle of“limited by marker bed,control of depositional cycle and perform division and correlation hierarchically,finely dividing until single sand body,Es2 member is divided into 6 sub layers.（2）According to the analysis of sedimentary background and Facies mark,it confirms that ES₂ in this area is mainly fan delta deposit,Es2-1 sand group mainly develops underwater distributary channel and inter channel sedimentary microfacies;Es2-2 sand group is located at the end of fan body entering lake with sand body underdeveloped,as well as the shore shallow lake sediments are relatively developed.（3）Regarding main layer,analysis is performed for its physical characteristics,rhythmicity in intralayer sediments,interlayer types and distribution,and the heterogeneity degree of the layer is characterized quantitatively.Based on the physical properties,sand body distribution,sedimentary microfacies and interlayer distribution of main small reservoirs,the interlayer heterogeneity and planar heterogeneity are studied.（4）By analyzing the main parameters affecting reservoir heterogeneity,with consideration of sedimentary microfacies,methods of Grey Relational Analysis and Fuzzy Integrated Evaluation are adopted to make classification,evaluation and prediction to the reservoir in research area.According to the actual productivity,the evaluation criteria are established,and the reservoir quality in the study area is divided into three categories:Level III with the heterogeneity index of 0.1～0.35,Level II with the heterogeneity index of 0.35～0.65 and Level I with the heterogeneity index of 0.65～1.The reservoir quality of Es2-12 layer and Es2-13 layer is good with the larger scale of Level I reservoir development.The research achievement provides scientific basis for the further development of oil fields and the improvement of oil and gas production rate.