Chinese scientists have found that burying carbon dioxide in deep-sea sediments is expected to achieve safe and permanent storage. The study, published in the journal Science Progress in the United States on the 4th, shows that the facilities needed for deep-sea storage of carbon dioxide are similar to those used for combustible ice mining. The semi-submersible offshore platform, carbon dioxide injection is conducive to combustible ice mining, both can be carried out simultaneously.
Geological storage of carbon dioxide is one of the important means to reduce the greenhouse gas content. Conventional site selection includes deep saline aquifers, abandoned oil and gas fields, deep coal seams, etc., but carbon dioxide may rise in the formation and there is a risk of leakage.
The author of the paper, Zhang Dongxiao, dean of the School of Engineering, Peking University, told Xinhua that the deep sea storage made full use of the high pressure and low temperature conditions of deep sea sediments. Under such conditions, high density liquid carbon dioxide will cause negative buoyancy, and carbon dioxide will Reacts with water to form carbon dioxide hydrates, two factors can prevent carbon dioxide from floating up in the formation.
The first author of the paper, Teng Yihua, a Ph.D. student at Peking University Institute of Technology, said that compared with previous studies, this study considered the effects of dissolved components and hydrate formation in the formation, and improved the deep sea geological storage of carbon dioxide from a simple conceptual model to an accurate one. Physical process simulation. The research results are expected to make deep sea geological carbon storage another alternative to terrestrial carbon sequestration.
