Investor Presentaiton

Disclaimer and important notice Cautionary statement regarding Dorado contingent resources estimates Santos Dorado is located in WA-437-P in which Santos is operator and holds an 80% interest. Dorado-1 confirmed the basis of the discovery by demonstrating the existence of a significant quantity of potentially moveable hydrocarbons in the Caley, Baxter Crespin and Milne reservoirs by sampling, testing and logging procedures. Dorado-2 successfully appraised the down-dip extent of the field and reaffirmed the basis of discovery and updated estimates of moveable hydrocarbons with further sampling, testing and logging. Drilling of the Dorado-3 appraisal well was underway as of the date of this presentation and results from the well may alter the estimates contained herein. In estimating the contingent resources, standard industry techniques combining geophysical and geological modelling and interpretation with reservoir engineering modelling have been applied. 2019 compositional simulation studies have modelled miscible flood with LPG rich gas injection. This provides a gas handling solution and has had a positive impact on the Caley oil recovery factor range and condensate recovery from secondary gas reservoirs (Baxter, Crespin and Milne). There is remaining uncertainty in some of the input parameters and these have been incorporated in the range of outcomes. The key contingencies to prevent classification of reserves are completion of the appraisal program, final development plan and investment decision. Following completion of the Dorado-3 appraisal well, all results will be analysed and expected recoverable volumes reassessed and incorporated into the year-end 2019 annual reserves and resources statement. Firm intention to progress the project will be based on the results of the appraisal program and confirmation of the development concept. Fuel, flare and vent has not been excluded. Santos prepares its petroleum reserves and contingent resources estimates in accordance with the 2007 Petroleum Resources Management System (PRMS) sponsored by the Society of Petroleum Engineers (SPE). Unless otherwise stated, all references to petroleum reserves and contingent resources quantities in this presentation are Santos' net share. Reference points for Santos' petroleum reserves and production are defined points within Santos' operations where normal exploration and production business ceases, and quantities of produced product are measured under defined conditions prior to custody transfer. Petroleum resources are typically prepared by deterministic methods with support from probabilistic methods. Conversion factors: 1PJ of sales gas and ethane equals 171,937 boe; 1 tonne of LPG equals 8.458 boe; 1 barrel of condensate equals 0.935 boe; 1 barrel of crude oil equals 1 boe. All estimates of petroleum reserves and contingent resources reported by Santos are prepared by, or under the supervision of, a qualified petroleum reserves and resources evaluator (QPRRE). References in this presentation to Dorado contingent resources represent an interim estimate as at 30 June 2019. Estimates will be updated as part of the Santos annual reserves process as at 31 December 2019. The estimates of petroleum contingent resources for Dorado in this presentation are based on and fairly represent information and supporting documentation prepared by, or under the supervision of Mr Ian Pedler who is a full time employee of Santos and a member of Society of Petroleum Engineers (SPE). Mr Pedler meets the requirements of QPRRE as defined in Chapter 19 and rule 5.41 of the ASX Listing Rules and consents to the inclusion of this information in the form and context in which they appear in this presentation. Western Australia & Northern Territory Site Visit 2019 39

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