Three-dimensional Digital Core Structure Characterization Method and Application of Thick Limestone in Baotu Spring Basin of Jinan

The identification of rock structure has a significant impact on the mechanical properties and seepage characteristics of reservoir. In order to truly, accurately and intuitively characterize the pore structure characteristics of rocks, the thick limestone core samples in Baotu Spring basin were scanned by CT and a three-dimensional digital core was constructed, and finally the three-dimensional display and quantitative characterization of the pore structure characteristics of the core were realized. The research shows that the pore types of this rock mass are mainly intergranular pores, dissolution pores and a few intergranular pores, with an average pore radius of 15.71 μm and a permeability of 0.51. The small pores are the main reasons for the low permeability of this rock mass. This technology can also quantitatively identify pores, and has the characteristics of visual and nondestructive samples. It has greater advantages for the characterization of rock pore structure.