1887
PDF

Abstract

The global warming is one of the most serious environmental problems of the day. CCS (Carbon dioxide Capture and Storage) technology, which is one of the most effective CO2 discharge control technologies, is expected to suppress the CO2 emission into the atmosphere. There are several options for the storage in CCS. Geological storage is one of the options but is the most feasible. Monitoring is essential and necessary not only for the accountability of the CO2 storage but also the safety of the CO2 injection. The operation from the critical damage should also be planned in the case of an abnormal monitoring data. The seismic reflection method is often used in the CO2 storage sites because most of the sites are in the oil/gas fields and the seismic reflection is the most popular and fundamental survey method in the petroleum field. However, seismic velocity does not change at the proportion of the CO2 saturation change in the laboratory test (Nakatsuka et al., 2009), indicating that the seismic velocity decreases rapidly during the CO2 injection but the no remarkable decrease is detected after the CO2 saturation up to about 30% . Moreover the seismic reflection method is expensive to carry out. To overcome these disadvantages of the seismic monitoring we have started a research work using the electromagnetic phenomena. Monitoring using geoelectric method was applied to an air injection and the increase of the geoelectric potential was observed. We have been monitoring earth-surface SP during gas injection tests at various sites in Japan. When air was injected into a 100-meter well within a geothermal field, a remarkable simultaneous increase in SP centered on the wellhead was observed. To explain the increase of the geoelectric potential, theoretical analysis was carried out.

Loading

Article metrics loading...

/content/papers/10.3997/2352-8265.20140105
2009-10-15
2024-03-29
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2352-8265.20140105
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error