ANALYSIS OF PORE STRUCTURE CHANGES IN INDONESIA CARBONATE ROCKS DUETO CO2 INJECTION

• Main Author: Agatha Manullang, Tri
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76494
• Institution: Institut Teknologi Bandung

CO2 emissions in the atmosphere can be reduced by the CCS method (Carbon Capture and Storage). CCS is a method of injecting CO2 into deep and permeable geological reservoirs, like carbonate reservoirs. This study aims to analyze chemical reactions and changes in the structure of the pores before and after the injection of CO2 into the carbonate rocks of Indonesia. The injection of CO2 into the carbonate rock is done by immersing the rock in a solution of carbonate acid (H2CO3) for several time variations, namely 3 days, 7 days, 14 days, 21 days, and 28 days. Measurement of the mass of the rock as well as observation of the structure of the pores using a microscope was done before and after the injection for all variations in the time of injection. The resulting image of the porous structure will be used to measure the porosity value of the rock using the thresholding method. Experimental results showed that the mass of carbonate rocks decreased due to the chemical reaction between carbonate and carbonate acid, causing the mineral carbonate to dissolve. That makes the pores of the rocks grow. The porosity value of carbonate rocks obtained from the helium. The porosity measurement was 3.12%. Porosity measurements using the thresholding method showed the porosity of carbonate rocks increased during the injection. This study concludes that the chemical reaction between carbonate rocks and carbonate acid causes the mineral carbonate to dissolve so that the rocks' pores become larger. The microscopic image shows a change in the structure of the pores during the injection. The carbonate mass is inversely proportional to the time of injection, while the solute mass is equal to the injectable time. The porosity value compared to the injection time is straight, so the longer the injections take, the greater the porosity value.