Characterization Of Shale Reservoir In Oil-producing Period Reservoir

In order to improve the understanding of the shale pore structure characteristics,especially to raise awareness on the nanometer scale micro pore structure characteristics,and study on the stage of hydrocarbon generation mud shale reservoir space effectively,selecting the eastern lacustrine shale samples to carry out the rock pyrolysis,TOC,X-ray diffraction,scanning electron microscope?SEM?,field emission scanning electron microscopy?SEM?,high pressure mercury,CO₂ and N₂ low-pressure adsorption test analysis.By scanning electron microscopy?SEM?observed the Songliao Basin Qingshankou shale micropore pore characteristics,found shale pore types,development more,development is mainly intergranular hole and mineral interlayer joints;field emission scanning electron microscopy observation to the clastic particles hole edge,clay mineral hole,particulate organic matter edge hole,intergranular hole and a small amount of organic pore.Comprehensive utilization of high pressure mercury porosimetry,nitrogen adsorption method,CO₂ adsorption method fully reflect the shale pore distribution in each aperture and an analysis of nitrogen adsorption curve,CO₂ adsorption curve morphological characteristics.The results show that nitrogen adsorption isotherms closer to type IV isotherm,CO₂absorption desorption isothermal curves for typical type I isotherm.With the help of fractal theory,respectively,using high pressure mercury data and nitrogen adsorption data,researches the mud shale pore fractal characteristics,and study the fractal dimension and TOC,S₁,OSI,average pore size,BET specific surface area,pore volume and mineral content between.At the same time,the nitrogen adsorption fractal dimension of data acquisition for the bridge,multi angle comparison of marine and lacustrine shale pore structure differences.Different maturity shale pore development the main controlling factors of different,maturity?R_O?greater than 1.0%of the samples in nanoscale pores are well developed,and positive correlation between pore volume and the content of TOC and mature degree ro less than 1.0%of the sample types of pore are not very developed and pore volume and the content of TOC and little correlation;porosity development degree and the content of clay minerals,carbonate content did not significantly correlated.In this paper,using statistical methods of correlation between different ranges of pore size and pore volume of shale oil S₁ speculated that the minimum diameter is 40nm in pore of shale oil.