We are Ecteras
A global team of subsurface experts
We are a high-endadvisory 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.
Our story
From ExploCrowd to Ecteras: A story of adapting, learning and going deeper.
-
Ecteras started out as ExploCrowd in 2016, in the middle of a downturn. The idea was simple but ambitious: build a team ready to support clients when the need for subsurface expertise, exploration geologists and specialised disciplines returned.
A fun detail: Our founder, Sidsel Lindsø, got the idea for the company on a plane from Copenhagen to Bologna, and the concept was created while walking the streets of the historic city.
With support from Innovation Norway and early investors, the team set to work mapping Norway’s offshore subsurface, interpreting available seismic and well data to create new concepts and ideas. By 2017, the first paid projects were underway, focusing on prospectivity in the Barents Sea.
Relevant articles and case studies from this chapter include:
-
Like our industry, we have faced ups and downs. From a promising business outlook in 2018, we quickly ran into challenges with oil price drops, market shifts, and later the Covid pandemic that tested our resilience.
A hard fact: When the pandemic hit in March 2020, work worth millions was cancelled within days.
At a time when many assumed oil and gas had no future, we chose to adapt by studying what it would take to make geological CO₂ storage work as a business. That decision placed us ahead of the curve, with insights and efficiency that soon proved invaluable to clients.
Relevant articles and case studies from this chapter include:
-
With both subsurface data and the technical expertise needed, demand grew. Following a task-force model often meant 20+ specialists working alongside clients to identify the best CO₂ storage sites or mature oil and gas prospects. Our work contributed to awarded licenses in both areas.
During quieter periods, we prioritised multi-client studies, including a full review of Denmark’s onshore and nearshore CO₂ storage capacity.
Worth noting: Our studies gave us full insight into all awarded CO₂ storage licenses in Norway and Denmark.
Relevant articles and case studies for this chapter include:
-
By 2024, rising costs had changed the market again (hello “Capex Focus”). Clients were no longer looking for extra hands. Instead, they needed high-end, independent expertise. This shift made it clear that it was time for something new – a brand reflecting our scientific expertise,
And so, Ecteras was born. A name that carries our legacy (EC from ExploCrowd) and our foundation (teras from Terra – Earth).
Relevant articles and case studies for this chapter of our story include:
-
The energy landscape is changing fast. But one constant remains: the world will need subsurface expertise to navigate risk and unlock opportunities.
At Ecteras, we bring extensive experience, deep insights and expertise relevant for both CCS projects and the oil and gas industry. Our role is to be a trusted plug-in innovation team – enabling our clients to move fast with confidence and without compromising quality.
Our story is still being written – with clarity, courage and care.
Relevant articles and case studies include:
Meet the experts
-
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.
-
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.
-
![Ecteras Subsurface Experts are verified as supplier in the Magnet JQS supplier database with a rating of 151.]()
Supplier Qualification
-
![Ecteras Subsurface Experts are certified by the Achilles Supplier Database and live up to the strict requirements for efficient Quality Management.]()
Supplier database
-
![Ecteras Subsurface Experts have a Triple-A Credit Rating, and therefore there is little financial risk for clients doing business with us.]()
Highest creditworthiness
-
![Ecteras Subsurface Experts have access to Norwegian Petroleum Data Diskos database, containing well data, production data and seismic data from the subsurface of offshore Norway. This is the database that all Norwegian oil companies use.]()
Seismic and well database
