METHOD OF DETECTING THE LEAKAGE OF OFFSHORE GEOLOGICALLY STORED CO2 BY MEASURING DIAMETER PROFILE

摘要

A method for detecting the leakage of CO_2 stored in the submarine sediment using shape change measurement comprises: (A) a step of measuring the radius of CO_2 bubbles which pass the lower part of a CO_2 bubble detector located in the seabed; (B) a step of measuring the radius of CO_2 bubbles which pass the upper part of the bubble detector; and (C) a step of calculating the reduction rate of the radius of the bubble obtained in steps (A) and (B). Steps (A) and (B) can be a step of measuring the radius of a CO_2 bubble image photographed by a camera which is installed in the CO_2 bubble detector. The photography of the CO_2 bubble in steps (A) and (B) is desirably to photograph a bubble image which is reflected by an optical tube assembly of a CO_2 bubble discharge detector. In addition, the method can determine whether or not CO_2 stored in the submarine sediment is secondarily leaked into the air, from the depth of water and the reduction rate of the radius of the CO_2 bubble obtained by a calculating unit. [Reference numerals] (AA) Start; (BB) End; (S100) Measure the radius of CO_2 bubbles in the seabed; (S120) Measure the radius of CO_2 bubbles in the upper part separated at a fixed distance; (S140) Determine whether or not CO_2 is leaked into the air based on the depth of water and the reduction rate of the radius of the CO_2 bubble