Abstract: A reconstruction method for a pore structure of a core with micro-CT (Computed Tomography) is provided. With utilizing a FIB-SEM (Focused Ion Beam-Scanning Electron Microscope) experiment, an actual porosity corresponding to a grey level in micro-CT results is obtained, so as to establish a relationship between the grey level of a micro-CT image and the porosity. Thereafter, according to the above relationship, a certain porosity is assigned to each pixel in the micro-CT image, so as to establish a soft segmentation method of the pore structure. The reconstruction method provided by the present invention discloses a soft segmentation method for digital reconstruction of the pore structure of the core combined with FIB-SEM data and micro-CT data, and establishes a fractional digital pore structure model of the core, which further improves a matching degree between the digital pore structure model of the core and an actual core.

Abstract: An isotope nuclear magnetic method for analyzing ineffective water absorption of rock pores includes steps of: saturating core pores of a core sample with a wetting phase fluid of water H2O, and obtaining a core T2 spectrum after being saturated with the water; re-saturating the core pores with a wetting phase fluid of heavy water D2O, and obtaining a rock baseline T2 spectrum; injecting fluorinated oil into the core sample saturated with the heavy water; injecting the water H2O, simulating a water injection process, and injecting the fluorinated oil, so as to analyze a content of immobile water and obtain a residual T2 spectrum, wherein a range formed by a difference between the residual T2 spectrum and the rock baseline T2 spectrum is an ineffective water absorption portion of the rock pores, and an ineffective water absorption amount is obtained.