关键词: 孔隙结构, 二值化, 分形维数, 采油指数, 青海油田, 柴达木盆地

Abstract:

Petrologic characteristics, physical properties and pore structure characteristics of Toutunhe Formation in eastern Fukang slope were studied using casting thin section observation, scanning electron microscope analysis, mercury injection test. The results show that the lithology of Toutunhe Formation is dominated by feldspar lithic sandstone and lithic sandstone with the characteristics of low compositional maturity and medium-high textural maturity; physical properties is well and the medium permeability reservoirs have a higher proportion; the main types of pores in this zone are intergranular pore and feldspar dissolved pore, while the types of throat are mainly narrow neck shape and sheet shape; pore structure has the characteristics of medium-small pore throats, poor sorting and well pore throat connectivity. Besides, by means of nonlinear canonical correlation analysis among characteristic parameters of microscopic pore structure and macroscopic physical properties, the classification parameters of pore structure were picked out. The methods of data configuration and mathematical statistics were used to establish classification standard of pore structure. The reservoir pore structure of Toutunhe Formation is classified into four types on the basis of this classification standard: macro-medium pore and coarse throat structure （typeⅠ）, medium pore and medium throat structure（typeⅡ）, mediumsmall pore and fine throat structure （typeⅢ） and small-micro pore and micro throat structure （typeⅣ）.

Key words:  , pore structure ； binarization ； fractal dimension ； productivityindex ； Qinghai Oilfield ； Qaidam Basin