Yangsanmu Oilfield Braided River Reservoir Architecture Vertical Characteristics

The area of Yangsanmu Oilfield is located in Yangsanmu Autonomous Township of Hui nationality,Huanghua City,Hebei Province.It is located on the west bank of the Bohai Bay and 7km south of Huanghua City.The terrain in the area is gentle and the ground elevation is about 3m.The Yang 11-16-1 well is located on the structure of the Yang 3rd fault block of Huanghua basin and is a directional production well.In this paper,using core observation data,core analysis and test data,casting sheet identification data,scanning electron microscopy data and other test analysis methods,based on the theory of sedimentology,petrology,petroleum geology and other disciplines,completed the fine division of core architecture and core architecture characterization of the Guantao Group of Yang 11-16-1 Well provide a theoretical basis for the future development of high water-bearing oilfields in the region.Firstly,the core of Yang 11-16-1 well was observed and described.The characteristics of the reservoir of Guantao Group in Yang 11-16-1 well were studied by using core observation data and core analysis data.The reservoir rock composition,physical properties characteristics,pore structure characteristics and diagenesis characteristics of the reservoir of Guantao Group in Yang 11-16-1 well are identified.On the basis of the above knowledge,based on the core observation data,combined with debris particle size analysis and other data to identify the Facies marks,the sedimentary facies is determined as the braided river facies,and the sedimentary combination pattern of the braided river facies in Yang 11-16-1 well is proposed.Through the analysis of the core observation data,combined with the core characteristics,the core architecture elements of the braided river reservoir of Guantao Group in the Yang 11-16-1 well are divided,and the correlation between the core architecture elements and the reservoir characteristics is analysed.The reservoirs of Guantao Group in Yang 11-16-1 well are ultra-high-porosity and ultra-high-permeability reservoirs.Porosity and permeability have a good positive correlation.The main lithology of the gradual body of the 9rd grade architecture elements is fine sandstone,the average porosity is about 35.69%,the average permeability is about 2990.62×10^-3μm²,and the average oil saturation is about 26.11%,are High quality Reservoir in this well.The intraformational heterogeneity of the 9rd grade architecture elements gradual body（single sand）of Yang 11-16-1 well is more developed with composite positive rhythm type and composite reverse rhythm type,and the interlaminar heterogeneity is weaker and the degree of homogenization is good.