Worldwide Petroleum Consulting
Dennis E. Thomas

Dennis E. Thomas

Dennis E. Thomas
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Dennis E. Thomas is a staff geologist for DeGolyer and MacNaughton, joining the firm in 1985. Prior to joining D&M, he worked as a geologist at Fagan Associates International Inc. and Calumet Corporation.

Thomas earned a bachelor’s degree in earth science and geography in 1971 and a master’s degree in earth science in 1973 from East Texas State University. A certified petroleum geologist, Thomas is a member of the American Association of Petroleum Geologists and the Society of Petroleum Engineers as well as other professional organizations. He became a Vice President at D&M in 1987.

Geographical Experience

  • Algeria
  • Angola
  • Argentina
  • Australia
  • Brazil
  • Brunei
  • Cameroon
  • Canada
  • China
  • Colombia
  • Denmark
  • Egypt
  • Gabon
  • Ghana
  • India
  • Indonesia
  • Italy
  • Kazakhstan
  • Kuwait
  • Libya
  • Mauritania
  • Mozambique
  • Nigeria
  • Norway
  • Oman
  • Pakistan
  • Russia
  • South Africa
  • United Kingdom
  • United States
  • Venezuela
  • Yemen

Topical Areas of Expertise

  • Basement and igneous reservoirs
  • Integrated reservoir studies
  • Computer modeling
  • Reservoir characterization
  • Depositional systems
  • Reserves estimation
  • Expert witness testimony
  • Quantitative risk analysis
  • Fair market valuations
  • Stratigraphic interpretation
  • Field development planning
  • Subsurface mapping
  • Fractured reservoirs
  • Unitization and equity determination
  • Geocellular modeling
  • Volcanic basins
  • Geostatistics
  • Wrench tectonics

Major Projects
Thomas has extensive experience in the Berkine and Illizi Basins of the Algerian Sahara. He has conducted detailed studies to plan placement of injector/producer pairs and observation wells in WAG pilot projects. These projects have included the largest fields in Algeria. Field studies made in Triassic, Silurian, Devonian, and Ordovician reservoirs have been used as a basis for field development planning. In these studies, he has used advanced geocellular and geostatistical methods to quantify reservoir heterogeneities in order to better predict reservoir performance under different operating conditions. He has helped place horizontal and sub-horizontal wells to capture displaced oil rim reserves in active gas cycling projects. These placements required the integration of geologic and engineering data on a real-time basis as the wells were being drilled.