In an effort to quantify energy supply security, particularly for oil and gas, the Oil and Gas Security Indexation study was published in 2017 as part of the Oil and Gas Security Studies under OGSI, which covered a study period of 2000-2013. This report is an update of the said study extending the period to 2015 (2000-2015) with some modifications in the methodology. Security risk indicators included in this report are compared with 2000 and 2013 levels (as revealed in the previous study) to determine improvement and/or deterioration in security risk level.