- Elin Skurtveit
- Senioringeniør, Petroleumsgeomekanikk og geofysikk (PGG)
- Norges Geotekniske Institutt - NGI
Structural derisking (Task 9)
The main ambitions are to reduce risk related to injecting and storing CO2 in the continental shelf, and contribute to maximize the CO2 injection volume for the Smeaheia region (Norwegian Continental Shelf storage region) as well as develop techniques to address fault-sealing and integrity.
The ambitions for this Task are to reduce risk related to injecting and storing CO2 in the continental shelf, and contribute to maximize the CO2 injection volume for the Smeaheia region (Norwegian Continental Shelf storage region) as well as develop techniques to address fault-sealing and integrity.
The Task was developed in collaboration with industry partners to ensure optimal contribution to the research of the Northern Lights project (Statoil, Shell and Total's carbon storage project) as well as contribution to optimization of CO2-storage fault risk procedures.
E.g. the Task will investigate:
- Faults and migration pathways in the Smeaheia region
- How to improve geological and geomechanical models for the area
- Challenges related to pressure depletion prior to injection
- Improved models for along fault flow and fault reactivation
- The possibility of additional storage volumes related to satellite storage sites (additional injection wells) in the Smeaheia region
The Task will contribute to the Northern Lights project through knowledge sharing of in depth research related to the derisking of CO2 storage on the continental shelf.
Important industry partners to the Task are Statoil, Shell, Total (as representatives for the Northern Lights Project) and Gassnova (As provider of Smeaheia data set etc.). The potential for acquiring new partners is currently investigated.
- Extensive fault mapping using Gassnova 3D seismic completed for Alpha structure providing a detailed (academic) fault dataset as basis for further fault seal analysis and migration models
- Complexity for polygonal faults and faulting of beta structure documented and detailed interpretation in progress
- Fault slip stability screening performed identifying the fault rock properties as the most critical parameter for fault slip risk
- Machine learning algorithm for evaluation of leak of test (LOT) data established
Impact and innovations
- The extensive fault mapping and geological system characterization for the Smeaheia area was shared with Northern Lights project.
- The fault derisking work has resulted in an increasing awareness of the need for better understanding of risk related to faults in order to utilize the large potential of storage volume within faulted reservoirs.
Main activities are related to establishing a good platform for collaboration between research partners, industry and the Northern Lights project.
The workshop in fall 2017 was an important arena for knowledge shearing and defining important research tasks related to fault seal and integrity evaluations for the Norwegian CCS project (NORCCS).
Detailed mapping of faults in the Smeaheia area has started focusing on both sealing potential of major faults in the area and leakage risk into the polygonal fault system in the overburden.
Tools for screening of critical stressed faults is under development together with a more detailed assessment of fault rock properties based on the spares data available.
Workshop viewing the core from Smeaheia
NCCS Task 9 - Structural Derisking - started the new year with a very successful workshop viewing the core from well 32/4-1 of Smeaheia.
The workshop was led by Anja Sundal, UiO and gathered participants from UiO, NGI, Statoil, Northern Lights Project, Gassnova and Sintef for an interesting discussion on the geological model of Smeaheia.
Photo: Alvar Braathen, UiO