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.

Results 2018

Main Results

  • 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.
Figure illustrating 2018's main results from fault slip stability screening illustrating the need to better constrain the fault streng properties (cohesion) for Smeaheia in order to reduce the risk related to fault reactivation. Qualitative risk level shown for differnet methods adressed.

Results 2017

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

Conference Publications

2019:

  • Comparison between two Late Jurassic CO2 storage prospects with respect to structural derisking Smeaheia area, Norwegian North Sea - J.L. Osmond, M.J. Mulrooney, E. Skurtveit, A. Braathen. NGWC
  • Analogous juxtaposition of mixed litologles against a sillciclastic hydrocarbon reservoir and proposed CO2 storage formation in the Norwegian North Sea - J.L. Osmond, M.J. Mulrooney, E. Skurtveit, A. Braathen. ACE 2019, San Antonio, Texas
  • 3D geologic framework and structural derisking of two offshore CO2 storage prospects in the Smeaheia area, Norwegian North Sea - J.L. Osmond, M.J. Mulrooney, E. Skurtveit, A. Braathen. 2019 CLIMIT PhD and PostDoc Seminar, Oslo

2018:

  • Smeaheia, a potential northern North Sea CO2 storage site: structural description and de-risking strategies - M. Mulrooney, J. Osmond, E. Skurtveit, L. Wu, A. Braathen. 
  • 3D falut integrity screening for Smeaheia CO2 injection site - E. Skurtveit, J.C. Choi, M. Mulrooney, J. Osmond, A. Braathen. GHGT-14, Melbourne
  • First-pass 3D geologic interpretation and structural modelling of the alpha CO2 storage prospect in the Smeaheia area, Norwegian North Sea - J.L. Osmond, M.J. Mulrooney, E. Skurtveit, A. Braathen. NFIP PhD Seminar, Stavanger
  • Prediction of leak-off pressure in Norwegian offshore using NPD factpages and deep neutral network - J.C. Choi, E. Skurtveit, L. Grande. SEG 2018

Task leader

Elin Skurtveit

Senioringeniør, Petroleumsgeomekanikk og geofysikk (PGG)
0 47 478 93 848
Name
Elin Skurtveit
Title
Senioringeniør, Petroleumsgeomekanikk og geofysikk (PGG)
Organization
Norges Geotekniske Institutt - NGI