The geological CO₂ storage capacity of the Jeju Basin, offshore southern Korea, estimated using the storage efficiency.

摘要

We estimated the storage capacity for geological CO₂ sequestration of the Jeju Basin off southern Korea, northern East China Sea using the storage efficiency and a deterministic, volumetric method. We analyzed seismic and well-log data to get the geological parameters and used the storage efficiency parameters for deep saline, nonmarine sediments in open systems. The time interval of the basin fill from 1.2 to 2.8 s two-way traveltime was selected for the depth zone for CO₂ storage. This interval corresponds to the depth range of about 1200 m to about 3900 m and occurs mostly below the Late-Miocene unconformity which largely separates the thin nonmarine to shallow-marine sediments above and the thicker nonmarine sediments below. The time interval was divided into eight layers of equal time thickness of 0.2 s two-way traveltime to determine the representative porosity and the in situ pressure, temperature, and density of CO₂ for different depth ranges. The estimated geological CO₂ storage capacities for the rock volume in the eight-layer interval range from about 23.5x1012 kg (23.5 Gt) to about 687.0x1012 kg (687 Gt) with an average of about 196.0x1012 kg (196.0 Gt).