Position Title: Principal Reservoir Engineer and Decision Risk Analyst

• Perth Based
• 2 Year Max Term Employee
• Supporting the Subsurface Gas Supply Forecasting Team

At INPEX, our energy is helping to shape a brighter future.

We are proudly supporting positive outcomes in Australian communities, through jobs, training, and social and economic benefits. Our Australian energy portfolio includes Ichthys LNG which we operate, plus participating interests in Prelude FLNG, Darwin LNG, Van Gogh and Ravensworth. We are actively pursuing carbon, capture, and storage opportunities to help provide a cleaner upstream business for Ichthys LNG.

Our inclusive culture is key to our success – valuing diversity and bringing us together as a connected and innovative team. As an international company, INPEX offers unique opportunities to collaborate with colleagues from across the globe. We are keen to attract and develop passionate, motivated, and safety-minded people from all backgrounds who want to help support society’s growing need for secure, affordable, and clean energy.

We are seeking a Principal Reservoir Engineer and Decision Risk Analyst to join our INPEX Subsurface team in Perth on an Employee 2 Year Max Term contract. Join us in helping shape a brighter energy future.

Key responsibilities:

• Significant experience and competency in reservoir engineering, reservoir simulation, and integrated production modelling
  • Generate probabilistic integrated production modelling forecasts
  • Expand models to integrate new fields and wells in the forecasts
  • Perform and document thorough QC of inputs and model results
  • Assess value and trade-off of multiple depletion strategies, development scenarios, development sequences
  • Forecast reliability review: perform lookbacks on forecast and drive continuous improvement
• Prepare technical documents and reports supporting recommendations, business plan forecast, assumptions, constraints, and gas supply strategy
• Generate case maps of scenarios to assess
• Significant experience in economic analysis and decision analysis
• • Generate economic metrics from production forecasts
  • Develop probabilistic decision trees to recommend optimal decision under uncertainties and constraints

What we’re looking for:

We welcome candidates from diverse backgrounds and experiences. You will be a strong fit for this role if you bring: 

• Minimum of degree qualifications in Petroleum Geoscience or Engineering
• Post-graduate petroleum qualification preferred
• Demonstratable experience working in the oil and gas industry on exploration and development projects.
• Experience working in a multi-disciplinary subsurface team
• Previous experience working on the North West Australian shelf is preferable
• Experience of using Petrel, tNavigator, IPM suite, Quorum software

This role is for applicants residing in or willing to relocate to Perth.

Closing date for applications is 22.04.2026. INPEX reserves the right to close applications early should a suitable pool of candidates be identified. Please note that direct feedback on applications will only be provided to interviewed candidates.

What We Offer: 

Leave & Flexibility: 

• 16 weeks of fully paid parental leave.
• Options to purchase additional leave.
• Dedication to flexible work arrangements, encompassing variable hours
• INPEX Foundation Day, discretionary leave, and community volunteering leave.

Remuneration & Financial Benefits:

• Competitive remuneration package with performance‑based incentives.
• Superannuation above the standard guarantee.
• Salary packaging options, including novated leasing.
• Reward and recognition programs, including access to discounts from over 350 retailers.

Career Growth & Development:  

• Clear pathways for career development and internal progression.
• Structured leadership development programs with ongoing support.
• Dedicated study leave and access to learning and development opportunities.

Wellbeing:

• Access to wellbeing initiatives, including gym membership options and health resources.
• A supportive workplace focused on safety, balance and sustainable work practices.

Additional benefits such as Japanese language classes are available at select locations, including Perth.

We value diversity in our workplace – including beliefs, cultures, and lifestyles, so we can bring our true selves to work every day. If you believe that you have most but not all the requirements outlined above, we encourage you to still apply.

We welcome all candidates to advise us throughout the recruitment process if we can support you with accommodations to make this a more inclusive experience.