\begin{table}
\begin{tabular}{c c c} \hline
**Criteria** & **Classification of Pores** & **Characteristics** \\ \hline \multirow{4}{*}{Genesis and occurrence location [40]} & Organic matter pores & Pores are formed during the thermal cracking of organic matter to generate hydrocarbons, primarily developing between and within organic matter. \\  & & Pores are formed during sedimentation or diagensiti through processes such as crystallization, cementation, and dissolution, and are distributed between or within mineral grains. \\  & & & Including bedding-parallel fractures formed by sedimentation processes, and non-bedding-parallel fractures formed during diagenesis. Non-bedding-parallel fractures include hydrocarbon generation overpressure fractures, diagenetic shrinkage fractures, and dissolution fractures. \\ \hline \multirow{4}{*}{Formation stage [41]} & Primary pores & Belonging to intergranular residual pores, controlled by compaction and cementation. \\  & Secondary pores & Pores formed through diagensite modification based on primary pores, primarily controlled by dissolution processes. \\  & Mixed pores & Including partial primary pores and partial secondary pores. \\ \hline \multirow{4}{*}{Percolation characteristics [36]} & Total pores & The total sum of connected and non-connected pores within a reservoir, also referred to as absolute porosity. \\  & & Super-capillary pores & Pores diameter \(>\) 500 \(\upmu\)m. The liquid within the pores can flow freely under the influence of gravity. \\  & Connected pores & Capillary pores & Pores diameter from 0.2 \(\upmu\)m to 500 \(\upmu\)m. Fluid particles in the pores can only flow under the influence of driving pressure. \\  & & Microcapillary pores & Pores diameter \(<\) 0.2 \(\upmu\)m. The liquid within the pores is immobile and exists in an adsorbed state. \\  & Effective connected pores & The total of the reservoir’s ultra-micropores and micropores, also known as theoretical flow pores. \\  & & The total of supra-capillary and capillary pores that can participate in fluid flow under reservoir production conditions, also referred to as production flow pores. \\  & & The sum of capillary and super-capillary pores that can participate in fluid flow under reservoir formation conditions, also referred to as charge flow pores. \\ \hline \end{tabular}
\end{table} 
Table 2: Summary of pore classification. The Wufeng-Longmaxi Formation in the Sichuan Basin of China is a primary source of shale gas, characterized by high to over-maturity [43]. However, there is currently a lack of consensus regarding the identification and classification of organic matter components within shale. Current research generally agrees on the identification of solid bitumen in the Wufeng and Longmaxi Formation, but the recognition of alginite remains controversial. Amorphous organic matter is broadly considered to be secondary organic matter, although the source of certain structural organic materials remains unclear. Additionally, the pore development characteristics of these components are not yet fully understood. Despite their importance, comprehensive studies on the preservation states, distribution patterns, and pore development characteristics of organic matter are limited. In particular, research on how different organic matter components control pore development is scarce [44; 45; 46; 47]. Therefore, it is crucial to elucidate the genetic mechanisms underlying both organic matter and organic pores, as well as the multifactorial controls that govern pore development. This study, grounded in organic petrology theory, examines core samples from the Wufeng-Longmaxi formations (Ro \(>\) 2%) in the southern Sichuan Basin, collected from two wells: Well Y206 (Y206#) and Well Y101H3-8 (Y101H3-8#). Using argon ion polishing combined with scanning electron microscopy (SEM), the study investigates micro-scale characteristics of organic matter, including source types, morphological features, distribution patterns, and microscopic components.