Objective and Method Faced with the problems of carbon dioxide storage technology spanning multiple disciplines, having an ambiguous scope, and lacking standardized recognition, naming, and classification criteria, this paper proposes recognition standards and naming principles for carbon dioxide storage technology. It analyzes four common storage technologies: geological, shallow underground space, marine water body, and utilization storage technologies. Based on this, it determines the classification ideas and schemes for carbon dioxide storage technology.

Results and Conclusions  (1) Recognition standards for carbon dioxide storage technology: CO₂ must be effectively isolated from the atmosphere; the isolation period must be long-term or even permanent; it must be a human activity that reduces CO₂ in the atmosphere beyond the standardized baseline of atmospheric CO₂; it must be positive for reducing CO₂ in the atmosphere. (2) Naming principles in Chinese and English (including English abbreviations): Directly quote the names of well-known technologies; for names similar to well-known technologies, apply the naming rules of well-known technologies; for emerging technologies, use academic search engines and adopt the most frequently used Chinese and English names; in English, "sequestration" and "storage" have slight differences in the field of carbon sequestration, with "sequestration" emphasizing scientific mechanisms and "storage" having a broader scale or being more engineering-oriented. (3) Classification ideas: Adopt a hierarchical and categorized overall approach. First, divide into two major categories based on the differences in the marine and terrestrial environments where carbon dioxide storage occurs: land and ocean. Then, further classify based on the CO₂ storage space and mechanism elements. Next, classify based on storage depth and scale. Finally, classify based on the differences in storage ratio and time to determine the smallest types. (4) Classification scheme: It is divided into two levels. The first level is "environment-space-mechanism", corresponding to storage environment-storage space-storage mechanism,The three indicators at the first level are qualitative indicators..The second level is "sub-class-type-grade-mode", corresponding to storage depth-storage scale-storage ratio-storage time. Quantify the four indicators of the second level and establish a "two-level and seven-grade" classification system for carbon dioxide storage technology.