1887

Abstract

Summary

Oil production from the Shetland Group of the Gullfaks Field in the Northern North Sea is controlled by the presence of natural fractures. The fractures and the fracture network have been characterized using core description, thin section and CT analysis. The Shetland Group consist of interbedded chalk, marl and mudstone beds. Fracture distribution is controlled by the mechanical stratigraphy; shear fractures are most developed in the marls and tensile fractures in the chalk. Fracture density tends to be highest in chalks with low porosity. Open fractures are partly filled with calcite cement forming bridges between the fracture walls and/or lining on the fracture surfaces. The distribution of mechanical fracture aperture in 3D has been estimated along the fracture plane. The detailed fracture characteristics will be further used to address the micro-scale sweep efficiency and the geomechanical effects on single and two-phase fluid flow.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201801488
2018-06-11
2024-03-29
Loading full text...

Full text loading...

References

  1. Kulander, B.R., Dean, S.L. & Ward, B.J.Jr.
    , 1990. Fractured Core Analysis: Interpretation, Logging and Use of Natural and Induced Fractures in Core. American Association of Petroleum Geologists, Methods in Exploration Series, 8.
    [Google Scholar]
  2. Jonoud, S., Wennberg, O.P., Rozhko, A.Y., Naumann, M., Lapponi, F., Haugen, Å.
    2017. Microscopic sweep efficiency in fractured carbonate reservoirs: use of micro-scale models to study matrix fracture interaction. Extended Abstract. First EAGE Workshop on Evaluation and Drilling of Carbonate Reservoirs. 4–6 October 2017Potsdam, Germany.
    [Google Scholar]
  3. Naumann, M., Rozhko, A.Y, Wennberg, O.P. and Jonoud, S.
    Submitted. Experimental investigations of mechanical and flow properties of a natural fracture in an argillaceous chalk reservoir. Extended abstract submitted to EAGE 80th Annual Conference & Exhibition2018, 11–14 JuneCopenhagen, Denmark
    [Google Scholar]
  4. Nelson, R.A.
    2001. Geological Analysis of Naturally Fractured Reservoirs, 2nd edn. Gulf Publishing Co., Houston, TX.
    [Google Scholar]
  5. Rozhko, A.Y., Jonoud, S., Wennberg, O.P. and Naumann, M.
    2017. Modeling of normal net stress effect on fracture relative permeability and its effect on oil recovery from fractured carbonate reservoir. Extended Abstract. First EAGE Workshop on Evaluation and Drilling of Carbonate Reservoirs. 4–6 October 2017Potsdam, Germany.
    [Google Scholar]
  6. Rozhko, A.Y., Naumann, M., Wennberg, O.P. and Jonoud, S.
    Submitted. Modelling two-phase fluid flow in a natural fracture in chalk under different stress. Extended abstract submitted to EAGE 80th Annual Conference & Exhibition 2018, 11–14 JuneCopenhagen, Denmark.
    [Google Scholar]
  7. Wennberg, O.P., Casini, G., Jahanpahnah, A., Lapponi, F., Ineson, J., Graham Wall, B. and Gillespie, P.
    2013. Deformation bands in chalk, examples from the Shetland Group of the Oseberg Field, North Sea, Norway. Journal of Structural Geology56, 103–117.
    [Google Scholar]
  8. Wennberg, O.P. and Rennan, L.
    2018. A brief introduction to the use of X-ray computed tomography (CT) for analysis of natural deformation structures in reservoir rocks. In Ashton, M., Dee, S. and Wennberg, O.P. (eds). Subseismic-Scale Reservoir Deformation. Geological Society, London Special Publication 459, 101–120.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201801488
Loading
/content/papers/10.3997/2214-4609.201801488
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error