Reservoir Engineer

We are looking for a Reservoir Engineer to join Ad Terra’s regional office in Kuala Lumpur.

As part of the Reservoir Engineering team, you will contribute directly to reservoir evaluation, field development and production optimisation activities across our projects. The role is designed for an engineer with 2–5 years of experience who has developed solid technical foundations and is ready to take increasing ownership of reservoir engineering analyses and project deliverables.

Working alongside experienced reservoir engineers and multidisciplinary teams, you will apply reservoir engineering principles to real project challenges, develop your technical judgement, and progressively expand your responsibilities. We’re looking for solid technical foundations paired with real versatility — someone equally comfortable building toward deep reservoir engineering expertise and helping bring AI-assisted forecasting and modelling tools into how the team

works.

What You'll Do

Reservoir Performance & Analysis

Analyse reservoir and production performance using pressure, production and well data

Perform material balance, decline curve and other reservoir engineering analyses

Identify production trends, uncertainties and potential optimisation opportunities

Contribute to reserves and resource evaluations and associated technical assessments

Data & Quality Control

Gather, validate and interpret subsurface, production and well data

Assess data consistency and identify gaps or uncertainties affecting reservoir evaluations

Contribute to the definition of data acquisition and surveillance requirements

Maintain clear and traceable technical datasets and assumptions

Reservoir Modelling & Forecasting

Build, update and quality-check reservoir engineering models

Contribute to history matching and reservoir model calibration

Perform production forecasts and scenario evaluations

Run sensitivity analyses to assess reservoir uncertainties and development options

Interpret modelling results and translate them into practical engineering conclusions

AI & Digital Tools

Apply and help develop AI/ML-assisted production forecasting, decline-curve, and history-matching automation tools

Evaluate and pilot emerging AI tools to accelerate reservoir engineering analyses, scenario testing, and reporting

Contribute reservoir engineering domain expertise to Ad Terra's digital subsurface intelligence initiatives

Field Development & Production Optimisation

Contribute to field development studies and evaluation of development concepts

Assess well performance and potential production optimisation opportunities

Support well planning, intervention and surveillance activities from a reservoir engineering perspective

Contribute reservoir engineering input to multidisciplinary technical decisions

Technical Delivery & Projects

Take ownership of defined reservoir engineering analyses and work packages

Prepare technical notes, reports, presentations, maps, tables and supporting documentation

Present and discuss technical findings with project teams

Track assigned deliverables, assumptions, uncertainties and deadlines

Contribute actively to internal and client project meetings

Collaboration & Development

Work closely with geoscientists, drilling, production and other engineering disciplines

Seek technical review and guidance where appropriate while progressively working with greater autonomy

Keep up to date with reservoir engineering methods, tools and industry developments

Share knowledge and contribute to the continuous improvement of engineering practices within Ad Terra

What You'll Bring

University degree (BSc or MSc) in Reservoir Engineering, Petroleum Engineering or a related discipline

2–5 years of relevant reservoir engineering experience

Prior exposure to Oil & Gas industry projects (internship, fieldwork, or early-career role) strongly preferred

Good understanding of reservoir engineering fundamentals and subsurface workflows

Experience working with production, pressure and reservoir data

Exposure to reservoir modelling, forecasting and/or reserves evaluation

Ability to analyse technical information and develop sound engineering conclusions

Good communication and technical reporting skills

Ability to work effectively within multidisciplinary and international teams

Strong organisation skills and willingness to take increasing ownership of technical work

Proficiency in relevant reservoir engineering software and Microsoft Office

Comfortable working with and developing AI tools (e.g., Python scripting, ML-assisted forecasting or proxy modelling) to support and automate reservoir engineering analyses

Familiarity with PETRONAS Technical Standards (PTS) and the Malaysian upstream regulatory framework is an advantage

What We Offer

Permanent, full-time local contract with statutory EPF / SOCSO / EIS contributions

Medical and insurance coverage; competitive annual leave

Structured mentoring from senior reservoir engineers and exposure to international multi-resource projects across Ad

Terra's platform (Europe, Canada, Chile, Cyprus, Asia-Pacific)

• Thank you for considering joining our team. We look forward to reviewing your application!
• To apply, please submit your CV and a cover letter outlining your relevant experience.