CO2 geological sequestration Nagaoka Project


Overview of CO2 Geological Storage

What is CCS Technology?

Carbon dioxide capture and storage (CCS) is a technology for capturing, transporting, and storing CO2 emitted from large-scale fixed sources.

CO2 capture technology has already been adopted at fertilizer production plants, and other such locations. Geological storage holds promise as the most practical technology, because various already-existing technologies in fields such as oil-well drilling, underground storage of natural gas, and Enhanced Oil Recovery (EOR) are readily adaptable in terms of the CO2 injection and storage process.

The challenge is to separate CO2 at a low cost and continuously isolate it safely and securely over the long term.

CCS technology is garnering attention as a bridging technology in the new energy society of the next generation.

Large-scale CO2 emission sources and CCS technology

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Typical CCS system configuration

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Concept of CO2 Geological (Aquifer) Storage

CO2 geological storage is a technology that can reduce atmospheric CO2 emissions by separating and capturing CO2 from large-scale emission sources, such as coal-fired power plants, and then storing it in underground aquifers. If an appropriate aquifer located beneath a gas- and water-impermeable formation is selected, the injected CO2 can be stored safely over the long term. Natural gas and oil have been trapped in this type of geological structure for millions of years.

According to IPCC's Special Report on Carbon dioxide Capture and Storage, it is estimated that the world total geological storage capacity is at least 2000 Gt-CO
2 (equivalent to the world's total emission amount of 100 years). Also, in the case of adequately managed geological storage, it is considered that 99% or more of CO2 could be kept even after 1,000 years.

Concept of CO2 geological storage
(Source: "CCS2020" by the Industrial Science and Technology Policy and Environmental Bureau, the Ministry of Economy, Trade and Industry (METI))

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