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According to a report by the Physicist Organization Network on June 19 (Beijing time), an independent study by the National Research Council of the United States issued a warning that the risk of carbon dioxide capture and storage (CCS) is too high and it is possible to induce a larger earthquake. The study has been published in the latest issue of the National Academy of Sciences.
The study stated that CCS is currently a "practicable strategy" that is being considered by the UN's Intergovernmental Panel on Climate Change for the control of coal-based power generation and other industrial sources of carbon dioxide pollution. However, an expert from Stanford University in California disputes this and believes that although no large-scale related projects are in progress, it is impractical to take long time to store bulky fluids below the ground.
Professor Marc and Steven Gorelik, professors of geophysics and environmental earth system science, published an article saying: “Injecting large amounts of carbon dioxide into brittle rocks common in mainland China will trigger earthquakes with high probability. And even small to medium scale Earthquakes threaten the integrity of the CO2 reservoir seal. In this context, large-scale implementation of CCS may be a strategy that has high risks and will not significantly reduce greenhouse gas emissions."
CCS technology aims to reduce carbon dioxide emissions into the atmosphere through capture, liquefaction and high volume injection into the ground. The study pointed out that globally, the global production of about 27 billion barrels of oil each year, CCS's work will need to eliminate about 3.5 billion tons of carbon dioxide each year, or about the same volume of 28.6 billion barrels.
The study said that what is important is that projects that injected huge quantities of carbon dioxide in many locations around the world have, over time, modern seismic networks in just a few decades show that earthquakes are almost everywhere in the inland. occur.
CCS also needs underground leakage rates of less than 1% per millennium to achieve the same climate benefits of renewable energy. In recent years, sewage injected into the ground in the United States has been linked to the occurrence of small to medium-sized earthquakes. One of the reasons is that as early as 1960, Colorado had obvious examples; other examples appeared in Arkansas and Ohio last year. If you try to sequester CO2 into a formation for hundreds of years to tens of millions of years, the possibility of earthquakes of similar magnitude will be considerable.
The National Research Council of the United States pointed out that the CCS will involve the maximum amount of fluid injected into the ground for a long time and may cause a larger earthquake. However, the committee said in the report that because there are no more CCS projects in operation, it is difficult to assess the actual risks and more research is needed. (Reporter Hualing)
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