Study on fractal features of shale pore based on low temperature nitrogen absorption experiment

In order to more finely evaluate the porous structure features of the shale,a comprehensive analysis should be conducted on the data of the low temperature nitrogen absorption experiment A fractal theory was applied to analyze the features of the different pore type surace fractal dinension D, and the volunme fractal dmension D, and to compare the corelation relatonship between the fractal dimension and theporous structure featre parameters: The results showed that the D, valueof an ink-botle type alf losed pore( with Type l adsorption loop) was over 2.8,the D,value of a periphery open pore type parlleu plate pore(TypeⅢ) was ranging fromn2.6 ~ 2.8 and D, value of a periphery op.en type spire pore(Type Ⅱl)was 2.2~2.6.The D, and D,indridually had obicus core ato reationship withthe average pore size,ET specfic surtace BJH total pore volume.organic carbon contentToc and virnite refectance Ro.The porous fractal features of the shale shovwed that the D,and D individull could indicate the complexity of the pore inemnal surace and space fom could be applied to quanitaivel express he micopore stoucture and the geochemical features of the shale reservoirs.