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Geoscience & Reservoir

Imagine and Model the Subsurface

Geoscientists and reservoir engineers are the major players in the exploration, appraisal and development of oil&gas fields. They acquire, analyze and interpret subsurface data in order to obtain the best possible 3D representation of "petroleum reservoirs" (rocks in which hydrocarbons are found). The techniques used range from advanced methods in seismic imaging to numerical modeling of reservoirs. Such models not only make it possible to coherently synthesize all the geological information available but also to predict the future behavior of a field.

Geoscience and reservoir teams carry out Geology, Geophysics and Reservoir Engineering studies on areas where hydrocarbons are explored and produced (fields), based on documents and data made available and prepared by the Geoinformation métier.

Geologists and geophysicists, or geoscientists, try to describe, understand and reconstruct, in each area studied, the deposition and evolution over time of the various rocks. They base their reasoning on observations at multiple scales: rock samples taken from the surface, images provided by satellites, etc.

Petroleum geoscientists work essentially on two types of data: borehole data (well data), used to characterize the nature of the different geological layers crossed by a well, and seismic data, to mainly characterize the geometry of these layers. The seismic images obtained after processing the field data are interpreted. Their consistency with the well data makes it possible to generate a model of the subsurface, in order to identify and/or characterize possible accumulations of hydrocarbons.

When an accumulation is suspected or confirmed by one or more wells, "reservoir engineers" are responsible for evaluating the available hydrocarbon reserves, studying the production potential of the field and proposing the technical means allowing the optimization of this production. They help to develop scenarios and plans for field development that lead to specific recommendations: number, nature and location of wells, drilling schedule, production profile.

During this entire process, data analysis and preparation, in addition to providing access to qualified, validated and relevant data are essential steps.



  • Exploration Management
  • Subsurface Development Management


  • Geology Operations
  • Geological Formation Evaluation
  • Organic Geochemistry & Basin Modeling
  • Reservoir Geology & Geomodeling
  • Sedimentology Diagenesis Biostratigraphy
  • Structural Geology & Geomechanics


  • Borehole Seismics & Non-Seismic Methods
  • Geophysics Operations & Imaging
  • Seismic Reservoir Characterisation


  • Reservoir Operations
  • Reservoir Specialties
  • Reservoir Studies


  • Data Management & Architecture
  • Data Science
  • Geodetics & GIS
  • Numerical Methods
  • Remote Sensing & Image Processing
  • Technical Document Management


  • Development Geoscience
  • Exploration Geoscience
  • Exploration Supervision
  • Prospect Generation
  • Subsurface Development Integration
  • Subsurface Development Supervision

Current Offers

Job title Country
Ingénieur(e) Réservoir Confirmé (H/F) France
Ingénieur(e) Réservoir (H/F) France
PNG- Confirmed Reservoir Engineer (H/F) - URGENT France
Reservoir engineer or Geoscientist Junior - Specialty Petrophysics M/F France
PNG-Senior Reservoir Geologist (H/F) URGENT France