We are Ecteras
A global team of subsurface experts
We are a high-level advisory firm, born out of a genuine wish to empower our clients as they navigate the complexities of the subsurface.
Rooted in science, industry experience, and bold ideas, we bring it all together to deliver valuable insights, innovative solutions and fresh perspectives – with clarity, courage and care.
By working closely with our clients and partners, we turn complexity into clarity, and insights into impactful results. Grounded in data, driven by integrity – always seeking to go deeper.
Complexity isn’t the enemy. Confusion is.
For too long, subsurface work has been limited by fragmentation: isolated disciplines, incomplete data and decisions made without the full picture. The cost? Delays, missed opportunities, and risk in projects where clarity and precision are critical.
We believe the key to better outcomes lies in working together – integrating disciplines and combining perspectives, supported by an organisation built to enable it.
Our clients don’t just hire us; they join us. Together, we align science, technology and strategy around shared goals. Because when we understand more, we make better decisions. And better decisions below ground create better outcomes above it.
Meet the experts
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Geology, E&P and CO₂ storage
CEO of Ecteras
Sidsel combines deep geological knowledge with leadership experience to drive innovation in exploration, production and CO₂ storage. As an EU expert on CO₂ storage, she brings recognised authority to the field. Featured widely in media, she champions collaboration and creativity, fostering a culture where diverse perspectives fuel smarter solutions. Under her guidance, Ecteras delivers impact through teamwork, clarity and bold thinking. -
Geology, E&P and CO₂ storage
Sedimentology
George brings sedimentological and stratigraphic expertise across scales – from well interpretation to regional play analysis. By integrating seismic geomorphology, biostratigraphy, chemostratigraphy, petrophysics and image log interpretation, he delivers a holistic understanding of sedimentary processes and geological formations. His multidisciplinary approach helps unlock critical insights for exploration and development, creating high value for clients. -
Reservoir Engineering
REpublic
Lex brings international experience from Shell and Maersk Oil (now TotalEnergies), offering hands-on consulting in reservoir simulation, field development, and well and reservoir management. He has led major E&P projects, including production from large tight reservoirs and the maturation of complex development plans. Lex has extensive experience with geological CO₂ storage and has developed methods to accelerate simulation workflows and improve storage capacity assessments. He mentors client teams, ensuring sound technical outcomes through close collaboration.It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more.
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Geopressure Analysis
Markham Geopressure Solutions
With more than 20 years in the industry, Guy specialises in geopressure consultancy for well planning and local to regional reservoir, seal and overburden studies. His work is underpinned by extensive in-house interpretation databases. Guy has supported numerous CO₂ storage projects, assessing pressure systems, reservoir communication and seal integrity to determine safe containment thresholds. His integrated approach combines geomechanics and pressure prediction to deliver clarity in complex subsurface settings. -
Geology, E&P and CO₂ storage
Subsurfix
Christoffer has extensive experience in oil and gas, particularly in the Danish and UK sectors of the North Sea. At Carbon Cuts, he played a key role in the Rødby (Ruby) CCS project, building detailed expertise in geological CO₂ storage. He also brings valuable geothermal knowledge from his work at Innargi. With a broad background across subsurface exploration and energy, Christoffer contributes versatile knowledge to complex projects. -
Petrophysical Well Evaluation
PG Experience
Petter is a highly experienced petrophysicist with a strong track record from Schlumberger, Enterprise Oil, Norsk Hydro and Noreco. He specialises in well evaluation and reservoir characterisation, delivering trusted insights across Europe’s CO₂ storage projects. Petter’s work has been instrumental in assessing reservoir and aquifer quality. Known for his high standards, sharp analytical skills and commitment to knowledge-sharing, he is both a trusted advisor and a mentor to many in the field.
Strategic partners
Memberships and certifications
Achieving Achilles certification, being members of Magnet JQS, and adhering to ISO 9001 standards are integral to our commitment to maintaining a robust Quality Management System. Our Triple-A rating for financial credibility, we are proud of - and access to the Norwegian DISKOS database forms basis for our Ecteras subsurface database.
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Supplier Qualification
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Supplier database
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Highest creditworthiness
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Seismic and well database
