Ingénieur Senior Réservoir Géothermique

Role Overview

Title: Senior Geothermal Reservoir Engineer

Hours: Full-Time, Salaried

Location: Salt Lake City, UT, Hybrid (3 days in office, 2 days can be remote)

Benefits Eligible: Yes

Manager: Head of Exploration or Head of Reservoir R&D (depending on applicant's skillset)

Who you are

The Senior Geothermal Reservoir Engineer will play a critical role in understanding and forecasting geothermal reservoir performance and translating that understanding into field development decisions. A successful candidate will:

• Lead - own reservoir engineering workstreams end-to-end: test planning, execution support, interpretation, model updates, and recommendations.
• Model - move fluently between well test interpretation and numerical simulation, and reconcile mismatches between model predictions and field behavior.
• Collaborate - partner closely with geoscience, drilling, facilities, and operations teams to drive alignment and decision quality.
• Teach - raise the technical bar through strong documentation, clear communication, and mentorship across disciplines.

What you'll do

Well test design, execution support, and interpretation

• Plan and oversee well tests and surveillance programs (production tests, injection tests, pressure transient tests, interference tests, falloff/step-rate tests, spinner/PTS campaigns, and tracer tests as appropriate).
• Provide real-time support during tests and interpret results post-test (e.g., permeability-thickness, skin, boundaries, connectivity, injectivity/productivity, and reservoir pressure trends).
• Build repeatable analysis workflows, templates, and QC checks so results are trustworthy and comparable across wells and campaigns.

History matching and integrated reservoir/wellbore modeling

• Build, calibrate, and maintain reservoir models that match observed field history (rates, pressures, temperatures/enthalpy, injectivity/productivity, and tracer/connectivity signals).
• Perform sensitivity and uncertainty analysis; communicate what is known vs. uncertain and what data would most reduce uncertainty.

Forecasting, development planning, and optimization

• Generate production and injectivity forecasts under multiple operational and development scenarios (including uncertainty ranges).
• Evaluate reservoir management strategies (injection allocation, make-up well timing, pump strategies, and remediation options as relevant).
• Translate model outputs into decision-ready recommendations (generation impacts, operational tradeoffs, and key risks).

Data, tooling, and cross-functional communication

• Maintain high-quality operating datasets and ensure completeness and provenance across test data, production/injection data, and well logs.
• Build lightweight analytics (Python/SQL) to automate recurring analyses and monitoring dashboards.
• Present findings via concise memos and reviews; be the owner of the reservoir narrative that leaders and operators can rely on.

What we're looking for

• B.S. (or higher) in Reservoir Engineering, Petroleum Engineering, Mechanical Engineering, Geoscience, or a related field.
• 4+ years of reservoir engineering experience in geothermal and/or analogous subsurface industries (oil & gas, hydrogeology, CCS), with demonstrated ownership of well tests and reservoir modeling work.
• Proven excellence in several of the following technical skills:
• Well testing and surveillance: design and interpretation of PTA (build-up, falloff/step-rate), interference/connectivity tests, injectivity/productivity, and tracer-based diagnostics; strong data QC.
• Numerical simulation: develop and update geothermal reservoir models with wellbore models; calibrate against field data and integrate geologic constraints into conceptual and numerical models.
• History matching: ability to adjust parameters systematically, understand non-uniqueness, and communicate uncertainty and model limitations.
• Forecasting: scenario-based production and injectivity forecasts tied to operational constraints; translate results into actionable field recommendations.
• Cross-functional communication: write clear technical memos, present tradeoffs, and collaborate effectively with operations, drilling, and facilities teams.
• Nice-to-haves: reservoir-surface network integration; probabilistic history matching/optimization workflows; fluency in Python and SQL.

Location and Benefits

• The position is based out of our headquarters in Salt Lake City, Utah, and is a hybrid position with periodic travel (~15-30%) to operating geothermal assets.

Benefits include:

• Paid holidays
• 18 days PTO + PTO accrual increase based on tenure
• Medical, dental and vision coverage
• 401k Stock options
• Paid Parental Leave
• Growth opportunities at a company with a direct impact in displacing carbon emissions

Equal Opportunity Employer

Zanskar is an equal-opportunity employer and complies with all applicable federal, state, and local fair employment practice laws.