Reservoir characterization – a true multidisciplinary approach

The mature fields on the NCS are moving towards tail end production and most new discoveries are complex and often marginal.

We need to be even better at understanding and predicting the subsurface to be able to realize new volumes and enable IOR producing fields. A multidisciplinary approach to reservoir characterization and utilization of all relevant data is key to success.
The conference aims to present good multidisciplinary case studies and examples of novel and efficient ways of working on multidisciplinary reservoir characterization tasks. A main aim of the content will be to show how new digital technology can improve our reservoir understanding and predicitons.

I additions to talks there will also be an exciting core viewings. In addition to traditional core description the session will also focus on how new technology like CT and Hyperspectral scanning can give new insight from cores.

The conference aims to present good multidisciplinary case studies and examples of novel and efficient ways of working on multidisciplinary reservoir characterization tasks.
 

Gullfaks Shetland/Lista core viewing

The cores from Gullfaks well 34/10-C-50 display the Early to Middle Paleocene Lista Formation and Late Cretaceous Shetland Group. The C-50 well was completed as a producer and therefore have both core data and dynamic data. The matrix permeability found in the chalk / marl succession of Shetland is found to be much less than the effective permeability identified from production tests. The Shetland reservoir is considered to be a fractured chalk reservoir.

In addition to traditional core description and core studies CT scanning and infrared (IR) spectroscopy scanning has been performed.

The result from CT scanning was used for;

• Supporting decisions during well operation
• 3D mapping of fractures and burrows
• Calibrate to image logs and orientation of the core
• Supplement to structural core interpretation

IR scanning was used for both mineralogy and HC mapping.

Johan Sverdrup core viewing

The cores from Johan Sverdrup well 16/2-U-18 display the Mesozoic stratigraphy in the northern part of the field consisting of:

• Upper Triassic, continental Hegre Group
• Upper Triassic – Lower Jurassic, continental to paralic Statfjord Group
• Middle Jurassic, shallow marine Vestland Group
• Upper Jurassic – Lower Cretaceous, shallow- to open-marine Viking Group

High resolution CT-images were applied in the sedimentological analysis:

• Scanning occurs directly thought the liner giving high resolution image of the core without damage caused by slabbing
• Highlight sedimentological and structural features that are difficult to detect on core
• Very high-resolution bulk density and PEF that can be compared / depth match with logs

Alta core viewing

Alta core display will focus on the Ørn Fm. and overlying Permo – Triassic clastic carbonate succession encountered in the eastern flank of the Alta structure. The main depositional environments / reservoir units will be illustrated.

Knarr core viewing

The cores from the Knarr (Jordbær Vest) well 34/3-3S display the Lower Jurassic Cook Formation. The core covers the five lithostratigraphic units that comprise the reservoir at the Knarr oil field including the main shale (maximum flooding surface) that acts as a pressure barrier and separates the Upper and Lower reservoir units. This core will be used as an example for facies recognition of tidally-dominated deposits and a discussion around primary and secondary reservoir quality controls. An integrated view placing core-based observations into a local and regional depositional context, with the benefit of analogues will also be presented.