(1) according to the size of pore throat combination classification; (2) Divide the throat according to holes, holes and seams.

Combination classification; ③ Classification according to pore structure characteristics and its influence on development effect; ④ Classification according to pore structure; ⑤ pore structure of fractured carbonate rocks is classified according to fluid seepage and geometric characteristics; ⑥ Classification according to pore throat types; ⑦ Simplified model of pore structure.

2) Comprehensive classification of pore structure

① Professor Luo Zhetan's classification scheme; (2) Professor Di Shi Xiang's classification scheme; ③ Other classification schemes.

3) Mathematical geological method of pore structure classification

Commonly used cluster analysis, also known as point group analysis, group analysis, cluster analysis, ethnic analysis, etc. It is to determine the relationship between variables of each sample through some mathematical model, and then classify according to this relationship. At present, there are four main methods: systematic clustering, fuzzy clustering, graph theory clustering and dynamic clustering.

Parameters for quantitative evaluation of pore structure

1) reflects the parameters of the aperture.

① distribution of pore throat radius and pore throat size

The radius of pore throat (hereinafter referred to as pore throat radius) is measured by the largest sphere radius that can pass through the pore throat, and the unit is micron (micron). Pore throat radius is greatly influenced by pore structure. If the pore throat radius is large, the connectivity of pores is good, and the seepage ability of liquid in pore system is strong. The flow of liquid in the formation depends on the structure of pore throats, and the number, radius, cross-sectional shape of pore throats and the size of the contact surface between liquid and core will play a certain role.