Quick Caprock Integrity Analysis for CO Storage Sites in Malaysian Fields.
- Siti Syareena Mohd Ali (PETRONAS Research Sdn Bhd) | W. Ahmad Rafael W. Zairudin (PETRONAS Research Sdn Bhd) | Zainol Affendi Abu Bakar (PETRONAS Research Sdn Bhd) | Budi Priyatna Kantaatmadja (PETRONAS Research Sdn Bhd) | Issham Ismail (Universiti Teknologi Malaysia)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil & Gas Conference and Exhibition, 17-19 November, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 1.12.3 Mud logging / Surface Measurements, 7.2.1 Risk, Uncertainty and Risk Assessment, 5.8 Unconventional and Complex Reservoirs, 1.12 Drilling Measurement, Data Acquisition and Automation, 5.8.7 Carbonate Reservoir, 1.6 Drilling Operations, 5 Reservoir Desciption & Dynamics, 7.2 Risk Management and Decision-Making, 7 Management and Information
- CO2 STORAGE, SEAL STUDY, PORE PRESSURE, CAPROCK INTEGRITY, GAS WHILE DRILLING
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- 13 since 2007
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The purpose of this research work is to establish a quick method for caprock integrity assessment for carbon dioxide (CO2) storage site selection. There are three main components to evaluate a seal potential which are through seal capacity, seal geometry, and seal integrity. This research work focuses on evaluation of seal characteristics through its pressure behaviour and evidence of potential leakage. Various logs data such as gamma ray, sonic logs, density logs, and resistivity are utilized to establish 1D pore pressure analysis. At the same time mud logs data are used to investigate the similarity of hydrocarbon from reservoir and seal (if any). In this study, two mature brownfields namely Camos and Zhann have been identified and evaluated for their seal characteristics, thickness, environment of deposition and pressure regimes differences in order to determine their seal effectiveness through integration of pore pressure analysis, background gas or gas while drilling evidence and seal capacity from Mercury Injection Capillary Pressure (MICP) data. Camos field, a depleted carbonate field in Sarawak Basin with continuous seal shows an overpressure regime with gas chimney in immediate seal above it. Meanwhile Zhann field, a depleted clastic field in Malay Basin shows slight overpressure in deeper reservoirs and hydrostatic in most of the multistack sand reservoirs. Both fields show the evidence of effective seal through their own geological characteristics, pore pressure and gas component analysis. Nevertheless, both fields have their own challenges to be converted to potential storage sites. A detailed understanding and analysis are required for seal integrity evaluation which can lead to better plan establishment that may further reduce risks during selection of CO2 injection site and help to execute future well or field monitoring design.
|File Size||1 MB||Number of Pages||12|
White J.A, Chiaramontea L., Ezzedineb S., Foxalla W., Haoa Y., Ramireza A. and McNaba W. (2014). ‘Geomechanical behavior of the reservoir and caprock system at the In Salah CO2 storage project’. Proceedings of the Natural Academy of Sciences of the United States of America (PNAS), June 17, 2014, vol.111 no.24, 8747–8752. doi/10.1073/pnas.1316465111.