Overview of CO Geological Storage

Overview of CO₂ Geological Storage

What is CO₂ Geological Storage

Captured and collected CO₂ is transported by pipelines etc., and then injected into deep salime aquifers at the depth of 1,000m from surface facilities through injection wells. A larger quantity of CO₂ is stored in the deep subsurface because CO₂ is compressed. When CO₂ is injected into a formation, it displaces saline formation water in porous aquifers. Impermeable caprocks over deep saline aquifers prevent CO₂ migration to the surface.

Concept of CO₂ geological storage (source: "CCS2020" by the Ministry of Economy, Trade and Industry (METI))

The Activities of CO₂ Geological Storage

RITE conducted the experimental study to inject 10,000 t CO₂ at Nagaoka site of Teikoku Oil Co., Ltd. in Nagaoka, Niigata prefecture from July 2003 to January 2005 to demonstrate the geological storage technology. The injected CO₂ stored under the caprock was observed by the sonic wave survey. Also, the technology to predict the migration of injected CO₂ by computer simulations has been developed.

Overview of Nagaoka site

CO₂ Geological Storage Project