Sidsel Lindsø, founder and CEO of Ecteras Subsurface Experts. The firm was founded in 2016 as ExploCrowd and was renamed and re-branded as Ecteras in 2025.

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.

Ecteras Subsurface Experts sharing insights that make a difference for CO₂ storage business cases and exploration for oil and gas in the deep underground.

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 history

Our company Ecteras Subsurface Experts was started as ExploCrowd back in 2016. Here is our story.

  • Our founder got the idea for our company on the 10th of June 2016, on a plane from Copenhagen from Bologna. There was a downturn in the industry, and she wanted to create a company that planned ahead long term and was ready and available to support clients when better times would return and the need for subsurface expertise such as exploration geologists and the specialised disciplines were sought after again. 


    The strategy was to spend the time carefully mapping the underground under the sea offshore Norway, based on seismic data and calibrated with interpreted well data, available to the company via the Norwegian DISKOS database, hosted by the Norwegian Offshore Directorate. 


    Through careful interpretation of the data, diving deep into the detail, zooming out to calibrate with the bigger picture and then being given the time to zoom back in again to develop new hypotheses to test, the subsurface team was likely to bring new concepts and innovative ideas to surface. Perhaps these ideas and the underlying work could be useful for oil and gas companies for them to fasttrack their efforts? 


    The first sale secured work for the new hired team for the first and second year. The team went operational in January 2017, backed by angel investors and with Pre-seed funding from Innovation Norway. Here, we focused on oil and gas prospectivity in the Barents Sea. 

    Relevant articles and case studies include:

  • In 2018 we focused our efforts on the Utsira High area in the Norwegian North Sea and business looked promising, but at the end of the year there was a drop of 20 USD/barrel in the otherwise stable oil price at that time around 85 USD/barrel - and everything stopped. There was no other way out than send the team out on furlough - but it only lasted for two days, and then work was secured to take us through the winter. And then work picked up steadily after that, assisting both smaller and larger companies in Norway with exploration and development of oil and gas projects, and licenses were applied for and won. During this time we also focused our efforts on mapping out the geology of the Norwegian Sea, so we would be enabled to run fast when clients wanted us to work in this area.


    The Covid pandemic in 2020 hit the company hard and work worth millions got cancelled within days in the first week of March. Adapting to the harsh realities and the global assumption that oil and gas would no longer be needed, the team decided to initiate a study to understand what it would take to get geological CO storage to work and run a business case. The insights from the time spent resulted in our team being ahead of most others during the coming years, clients and competitors, in terms of technical insights and efficiency. 

    Relevant articles and case studies include:

  • Because our team had already mapped the entire subsurface of the continental shelf offshore Norway, and had the technical expertise for finding the best suitable storage sites that would fit a client strategy, we were chosen by several companies to be a task force team working for the companies. During these years we were often 23-25 people from different disciplines working together to deliver what the clients needed, both for finding ‘the best CO₂ storage sites’ but also for oil and gas exploration in areas where we are experts. This work resulted in awarded licenses, both for CCS and oil and gas exploration.


    During the periods with less activity we prioritised multi-client studies, and in 2023 we completed a study of the CO₂ storage capacity onshore and nearshore Denmark, which enabled us to have full insight into all awarded CO₂ storage licenses in Norway and Denmark.

    Relevant articles and case studies include:

  • In the spring 2024 we heard the words “Capex Focus” for the first time in years. At this point the costs for exploring for oil and gas, extracting it and storing CO₂ had increased dramatically over just a couple of years. And the market had changed for us: it was no longer the extra work force that was asked for. Our entire team had been booked out the year, but the client put the project on hold during the summer - and it was impossible to replace such an amount of work for so many people in the new market situation. 


    At this point it was necessary to rethink ExploCrowd, and with the growing interest from European clients and people outside our community who understands what exploration (our core competence) is, the timing was right for a new name and a visual identity that better reflected our scientific expertise to our international audience. 


    Hence, we closed the chapter of ExploCrowd and the new chapter with Ecteras Subsurface begun. The “EC” part of the name is a shortening of ExploCrowd and the legacy that we are so proud of, and “teras” is an academic version of Terra. Earth. It is pronounced [Ekteras].

    Relevant articles and case studies include:

  • With a world that becomes more and more complex and an energy landscape that changes rapidly, there will be a need for subsurface expertise and strategic insights to navigate the new territory.


    Our extensive practical experience and deep insights into the subsurface aspects and associated risks of all ongoing important CO₂ storage projects in Europe is currently making a difference for clients, and we expect this expertise to be relevant for all CCS projects moving ahead. 


    At the same time we are supporting the oil and gas industry with new ideas and concepts that could potentially create significant value, long term. Our ability to be a ‘plug-in innovation team’ will no doubt be valued in the future. 


    And on the side, our team of experts are investigating how we can find solutions to existing and future challenges, enabling us and our clients to move fast, with quality and confidence. 

    Relevant articles and case studies include:

The CEO of Ecteras Subsurface Experts Sidsel Lindsø was invited to share our story and how we work in the podcast by Innovation Norway Innopodden. If you are curious about our company, this is a great place to start as we touch upon the topics of:

- Starting out in the middle of an industry downturn.
- How we approach R&D and plan projects without knowing what we’ll find.
- Why we aim to be an 'Olympic team' of scientists.
- How we strengthen our clients’ teams rather than compete with them.
- What we consider sensible use of taxpayers’ money when it comes to CCS projects.

The episode is in Scandinavian. An English translation will follow.

The InnoPodden episode is available in Spotify an other podcast apps.

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.