Herdis Haerusalam [1], David Prambudi Sahara [2], Fatkhan [3]
[1] Study Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
[2] Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Insitut Teknologi Bandung, Ganesha 19, Bandung 40132, Indonesia
[3] Exploration and Engineering Seismology Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia

Email: herdissam@gmail.com

Abstract

CO2 injection into the hydrocarbon reservoir will affect the subsurface mechanics and hydraulic condition. The injection has to to avoid the occurrence of reservoir and/or top seal failure. In such case the simulation of the injected fluid propagation needs to be done to prevent the failure in top seal and reactivation of existing major fault. We use finite element method to perform this injection simulation. In this research, we will use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geology model is made in a dimensions of 3000 m x 3000 m x 2000 m. It consists of four layers which represent upper layer, top seal, reservoir rock, and basement. The grid around the reservoir rocks is set to be smaller to give more detail. The open hole injection is 850 m – 890 m depth with coordinates x = 1500 m and y = 1500 m. The rock elasticities parameters are assumed to follow an isotropic material. The initial pressure and temperature are graded to depth with a pressure gradient of 0.00981 MPa / m and a temperature gradient of 0.025 degrees C / m. Injection process is carried out with 6 kg / s of CO2 injection with simulation time for ten years, the modelling results show the simulation can be used to predict the spread of CO2 in the next 10 years.