Evaluating the pore structure of low permeability glutenite reservoir by 3D digital core technology

Abstract

Article highlights This paper uses the image binary segmentation method to separate the gray images of µ-CT scans of glutenite cores, and the pore space and skeleton of different rocks are characterized. And 3D gray images of 3D digital cores are constructed by PerGeos. The pore network model is used to analyze the reservoir pore structure, and the characteristic parameters of pore structure (such as pore radius, throat radius, pore-throat ratio, shape factor and coordination number of rock) are extracted, and the porosity and permeability are calculated to quantitatively evaluate the pore structure. The experiment data reveal that the main pore space of low permeability glutenite reservoir in the study area is micro-pore, with low pore coordination number, small pore-throat ratio, small pore radius and poor pore connectivity. These characteristics contribute to the low permeability reservoir, which has no obvious law of porosity and permeability, and its permeability is mainly affected by pore structure.

Keywords

• Digital core
• Low permeability reservoir
• Pore structure
• Glutenite
• Permian