Research On Reservoir Characteristics And Comprehensive Evaluation In Huangjindai Oilfield

In the context of secondary development in Huangjindai Oilfield, this thesis studies onits reservoirs in detail and caries on comprehensive evaluation. The research uses reservoirpetrology, reservoir sedimentology and various theoretical basis. Combing the research withstratigraphic, sedimentary and structural features, it studies on lithology and physical propertycharacteristics of the reservoir at the macro level, the pore structure features on a micro level,the heterogeneity of the reservoir, as well as the vertical and lateral distributions of thereservoir successively. Through the analysis of the dominant factors affecting the reservoirdevelopment in the study area, the research establishes the causal association betweensedimentation, diagenesis, tectonism and the formation, development, distribution of thereservoir. The thesis analyzes and interprets reservoir characteristics from both the micro andmacro point of view. Meanwhile, it takes the method of single factor evaluation andmultifactorial evaluation dominated by discriminant analysis respectively to accomplish thereservoir evaluation of61sedimentary units in the study area objectively andcomprehensively.The study shows that the main types of reservoir rock are feldspathic litharenite and therocks are mainly fine sandstone, medium-grit sandstone and glutenite. Most of reservoir rocksare medium porosity and medium-low permeability reservoirs. But the reservoir propertyshows great difference in each layer. Among them, Dongying Formation is mainly themedium-high porosity and medium-high permeability reservoir, the upper part of Member1of Shahejie Formation is mainly the medium-high porosity and medium-low permeabilityreservoir, the middle part of Member1of Shahejie Formation is mainly the medium porosityand medium permeability reservoir, and the lower part of Shahejie Formation is themedium-low porosity and low permeability reservoir, the Upper Member3of ShahejieFormation is mainly low porosity and low permeability reservoir. The main pore types of thereservoir are the intergranular pore and the dissolution pore, followed by the micro-pore andthe crack; the pore throat is thinner and the pore throat structure is medium. Reservoirs inHuangjindai Oilfield show a strong heterogeneity. Their distributions are controlled bysedimentary facies; the main diagenesis includes compaction, cementation, metasomatism anddissolution. Diagenesis periods belong to telodiagenesis A period and early diagenesis Bperiod. The ratio of class I reservoir, class II reservoir and class III reservoir in the study areaare14.6%、34.6%and50.8%respectively. The research provides geological supports for fine reservoir description in HuangjindaiOilfield and gives geological basis to the determination of favorable oil-bearing areas.Besides, the study confirms the potential of stable production in the next step, which issignificant to the optimization scheme of development adjustment measures for oil pools inHuangjindai Oilfield.