Suitability evaluation of CO₂ sequestration in the East China Sea Shelf Basin

Excessive greenhouse gas emissions have caused obvious global climate change and many secondary disasters. CO₂ capture and sequestration technology came into being. There are many CO₂ emission sources along the coast of the East China Sea, but the land basin area is small, which cannot meet the needs of huge amount of CO₂ storage. The continental shelf basin of the East China Sea ranks the third in the suitability of carbon sequestration in China's offshore basins, with a wide area and good sealing. On this basis, the suitability of basin level carbon sequestration in the East China Sea Shelf Basin was evaluated. Combined with expert opinions and available research results in analytic hierarchy. According to the relevant geological data of each secondary structural unit in the basin, the suitability evaluation index system and index weight were established by using fuzzy comprehensive evaluation, in which each evaluation index of each unit is scored according to the evaluation index grading, and the comprehensive suitability score is calculated by combining the weight. After comprehensively considering the carbon storage capacity, sealing, and operability, the evaluation results show that the carbon storage suitability is better in the eastern depression than that in the western depression, and the central uplift is the poorest. Among them, the Taipei Depression is the best unit in comprehensive suitability of carbon storage in the basin, which can be used as a priority experimental storage area.