Suitability assessment of carbon dioxide storage sites in sedimentary basins

¹ Oil Production Technology Institute, Dagang Oilfield Company, CNPC, Tianjin, 300280, China
² CNPC Dagang Oil Company, Tianjin 300280, China
³ No.5 Oil Production Plant, Dagang Oilfeild Company, PetroChina, Tianjin, China

^* Corresponding author: wxiaoy05@petrochina.com.cn

Abstract

The assessment of the suitability of CO₂ storage sites is the basis for large-scale deployment of Carbon Capture Utilization and Storage (CCUS) projects. However, the research on the suitability of CO₂ in sedimentary basins is relatively lagging behind in China. Previous studies have focused on CO₂ storage sites, while social, economic and environmental factors are ignored. This paper takes counties and districts as the research objects, and conducts a comprehensive evaluation of onshore sedimentary basins. The research results show that: (1) Onshore sedimentary basins cover 839 counties (districts) in China, of which 318 counties (districts) are prohibited from implementing CO₂ storage; 286 counties (districts) are Class II environmental risk areas; The suitable and suitable areas include 217 and 19 counties (districts) respectively, accounting for about 45% of the total onshore storage area. (2) The suitable and relatively suitable areas are mainly distributed in the Tarim Basin, the central and northern parts of the Songliao Basin, the northwestern part of the Ordos Basin, the northeastern part of the Erlian Basin, and the central and southern parts of the Bohai Bay Basin. Forbidden areas and general suitable areas are mainly distributed in Sichuan Basin, Jianghan-Dongting Basin, North Jiangsu Basin, northeastern Bohai Bay Basin, and southern Songliao Basin. This study establishes a method for assessing the suitability of CO₂ storage sites, and gives a suitable area for CO₂ storage in China, which provides a method and basis for the site selection of large-scale deployment of CCUS projects in China.