PRELIMINARY STUDY ON CARBON DIOXIDE GEOLOGICAL STORAGE IN DEPLETED OIL RESERVOIR IN FANG OIL FIELD, THAILAND

Abstract

Recently, climate change is the major global issue on environmental concern resulting from the emission of Carbon dioxide (CO₂) into atmosphere. The CO₂ sources mainly come from fossil-fired power generation and industrial sectors. The current technology used to mitigate and store CO₂ is carbon capture and storage (CCS) especially geological storage. In Thailand, CCS technology is still infant and less research has been studied. Therefore, this work is focused on the preliminary study on the CO₂ onshore geological storage in one formation of a depleted oilfield in Fang, the North of Thailand by using simulation. The model with local grid refinement demonstrates how CO₂ injected into depleted oilfield can be implemented with the flow rate from 1000-4000 tons/day based on the depth of this area around 2450-2550 meters. The pressure distribution and the movement of CO2 have been studied and predicted within a period from 1-50 years for CO₂ monitoring. The results present that 16 Mt of CO₂ storage can be achieved. Furthermore, pressure distribution and CO₂ migration are presented without breaking the caprock formation for the period of 50 years. This study can be used as a basic model for CO₂ storage in an onshore area in Thailand.