Norwegian-based independent geoscience consulting
Senior geoscience consulting for exploration, appraisal and development projects.
HT Exploration AS provides independent geophysical and subsurface expertise — combining seismic interpretation, Petrel workflows, prospect evaluation, development geophysics and AI-assisted technical workflows. Built on 16+ years of experience on exploration, appraisal and development projects internationally.
Services
Focused, senior-level geophysical support — from early prospect generation through appraisal to development decisions.
A · INTERPRETATION
Structural and stratigraphic interpretation of 2D and 3D seismic data, including detailed horizon and fault mapping. Robust, well-tied frameworks built to support exploration, appraisal and development decisions.
B · EXPLORATION
Prospect identification, evaluation and maturation toward drill-ready status. Play-based assessment, risk and volume framing, and structured support for APA-style licensing-round applications.
C · DEVELOPMENT
Geophysical input to field development and well planning, including target definition and subsurface uncertainty assessment. Integrated support that connects seismic understanding to drilling decisions.
D · RESERVOIR
Specialist interpretation of sand injectite systems and complex reservoir architecture, with focused experience on the UKCS and NCS. Clearer geometries for evaluation, appraisal and development planning.
E · WORKFLOWS
Advanced Petrel interpretation workflows, plus in-house course design and delivery. Practical mentoring that helps teams work more efficiently and apply consistent technical best practice.
F · AI-ASSISTED
AI tools and Python-assisted workflows applied to accelerate research, structure technical knowledge and support data analysis. A force multiplier for experienced geophysical and geological interpretation and analysis — never a replacement.
Advanced geophysical workflows
A practical command of the quantitative interpretation toolkit — applied with experience, calibrated to data quality, and integrated with the geological picture. Robust trap evaluation combines geophysics and geology: structure, seal, reservoir and fluid fill assessed together.
Hover or tap any capability for a short explanation.
Common hydrocarbon trap types — reservoir, seal and source rock with trapped gas (red), oil (green) and water (blue). Schematic; illustrative only.
Global perspective
"Global perspective. Norwegian geoscience expertise."
HT Exploration AS is a Norwegian-based independent consultancy, and Halvor Tellefsen has worked on exploration, appraisal and development projects internationally — across the Norwegian and UK Continental Shelves, the South Atlantic and the Middle East. Transferable geoscience principles, applied wherever the data and the play require them.
Regions of project experience
About
Halvor Tellefsen is a Senior Geophysicist and Principal Exploration Geoscientist with more than 16 years of experience and an MSc in Petroleum Geophysics. He works across exploration, appraisal and development geophysics — a dedicated prospect hunter who has been a key contributor to multiple APA licensing-round applications and to four discoveries.
He is recognised as a Petrel expert and advanced geophysical interpreter, with deep experience in seismic interpretation and mapping, AVO and wedge modelling, seismic-to-well ties, EEI analysis and EEI cube workflows, prospect evaluation and well planning support. He has also developed and delivered in-house Petrel courses, helping colleagues adopt efficient interpretation workflows and consistent technical best practice.
As an injectite specialist with focused experience on the UKCS and NCS, he combines structural and stratigraphic interpretation, prospect maturation, subsurface uncertainty assessment and development geophysics — integrating seismic, geological, well, petrophysical and reservoir information into clear, decision-ready subsurface understanding. His project experience extends internationally — he has worked on exploration, appraisal and development projects across the NCS and UKCS, the South Atlantic and the Middle East.
He is a strong team performer, a trusted collaborator and a genuine technical enthusiast with a committed, dependable attitude. He works through HT Exploration AS, his own independent geoscience consultancy. His current main assignment is Senior Expert Geophysics on OMV's Berling Development, delivered as a consultant through AGR / HT Exploration AS.
Client and assignment references are descriptive only and are provided to indicate the type and level of work undertaken. They do not imply endorsement.
AI-assisted geoscience
HT Exploration AS actively applies AI tools — including ChatGPT, Microsoft Copilot and Claude — alongside Python-assisted workflows to speed up interpretation, data gathering and screening, and to build a clear subsurface overview fast.
AI strengthens experienced G&G interpretation and analysis — it does not replace it. Technical interpretation, calibration and decision-making remain grounded in 16+ years of subsurface experience.
Contact
Interested in discussing a project, peer review, interpretation support or a consulting assignment? HT Exploration AS is available for focused, senior-level geoscience engagements.
