Since the Songo Songo field commenced commercial operations in July 2004 there has been a steady increase in certified reserves that can be attributed to excellent sustained reservoir performance and a greater understanding of the field. Information gained by the drilling of SS-10, SS-11 and SS-12 (in 2007, 2012 and 2016 respectively) along with additional seismic lines have provided this further understanding.


Following the drilling of the SS-11 well in 2012, a new geological model was prepared for the field.  The overall changes in the model did not materially alter the view of the main and southern area of the field but did increase the reserves in the Songo Songo North area. The model was revised again in 2016, following the drilling of the SS-12 well which came in approximately 100 metres high to prognosis.

In accordance with National Instrument 51-101 Standards of Disclosure for Oil and Gas Activities, the independent petroleum engineers, McDaniel and Associates Consultants Limited, prepare annual reserve reports that assess Orca’s natural gas reserves based on information on the Songo Songo field and Songo Songo North.

The natural gas reserves estimates for the Songo Songo field are based on volumetric estimates. The reserves are classified into Proved Developed Producing, Proved Developed Non-Producing, 1P (Proved), 2P (Proved + Probable) and are shown in the table below as at 31 December 2019.

Summary of Reserves

Reserve Category Reserves – Life of License
Company Gross (Bcf)
Proved Producing Reserves 234
Proved Developed Non-Producing Reserves -
Total Proved Reserves 234
Probable Reserves 31
Proved + Probable Reserves 265
Possible Reserves 23
Proved + Probable + Possible 288


The Company’s natural gas resources as at 30 June 2019 were also evaluated by McDaniel Associates Consultants Limited. This evaluation included contingent resources of 683 Bcf and a further 527 Bcf of prospective resources.