Worldwide Petroleum Consulting
Mark N. Varhaug

Mark N. Varhaug

Mark N. Varhaug
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Mark Varhaug joined DeGolyer and MacNaughton in 1998 after working for 24 years in exploration, development, evaluation, and appraisal. Prior to joining D&M, Varhaug worked for Cairn Energy USA.

Varhaug earned a bachelor’s degree in geology from Southern Methodist University in 1974. He is a member of American Association of Petroleum Geologists, Geological Society of America, and the Society of Petroleum Engineers, and is a licensed professional geoscientist in the States of Texas and Louisiana as well as an AAPG-certified petroleum geologist. He is also a member of geological societies in Dallas, Houston, and West Texas. Varhaug was elected a Vice President of D&M in 2001.

Geographical Experience

  • Angola
  • Argentina
  • Australia
  • Bangladesh
  • Bolivia
  • Brazil
  • Chile
  • China
  • Colombia
  • Ecuador
  • Egypt
  • Guatemala
  • India
  • Indonesia
  • Japan
  • Malaysia
  • Mexico
  • New Zealand
  • North Sea
  • Pakistan
  • Papua New Guinea
  • Peru
  • Russia
  • Thailand
  • Trinidad and Tobago
  • Tunisia
  • United States
  • Venezuela
  • Vietnam
  • Yemen

Topical Areas of Expertise

  • Geological mapping
  • Reservoir evaluation
  • Reserves estimation
  • Pre-salt reservoirs
  • Brazil onshore/offshore basins
  • Fractured reservoirs
  • Fluvial deposition
  • Turbidite environments

Major Projects

  • Worked with interdisciplinary teams to perform field studies and contingent and prospective resources assessments in Brazil, Mexico, Australia, China, and East Africa.
  • Performed geological studies and prepared in-place estimates for numerous multi-field projects in Bolivia, Brazil, Chile, China, Colombia, India, Indonesia, Mexico, New Zealand, Trinidad, Russia, and Yemen.
  • Performed field studies, estimated OOIP and OGIP, and assessed contingent and prospective resources potential in complex clastic, carbonate, and pre-salt environments.
  • Prepared reports on geological evaluations of unexplored and underexplored regions in the Caribbean and Latin America.
  • Evaluated reserves and contingent resources potential of areas in earliest stages of exploration and development in Brazil (onshore and offshore), Mexico, Colombia, Indonesia, and Guatemala.