Norwegian Sea Research Consortium

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Norwegian Sea Research Consortium

• Conoco-Phillips
• Gaz de France
• Norsk Hydro
• Statoil
• University of Oslo

University of Oslo Department of Geosciences
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• Primary Wells
• Helland-Hansen 6505/10-1
• Vema Dome 6706/11-1
• Ormen Lange 6305/1-1
• Solsikke 6403/10-1
• Secondary Wells (upon release)
• Gjallar Ridge 6704/12-1
• Havsule 6404/11-1
• Nyk High 6707/10-1
• Elida

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Background

• The project was initiated after recent
  exploration in the Møre and Vøring Basin
  indicated a serious problem in the prediction of
  the presence of reservoir sands related to
  deep-marine depositional systems.
• The aim of the project is to study sedimentary
  rocks from the Norwegian Sea with respect to the
  primary composition, diagenesis and log
  composition, with focus on the Cretaceous
  sequence.
• Mineralogical and geochemical analysis will be
  completed to establish relationships between clay
  mineralogy, carbonate and quartz cement and
  seismic velocities and attributes. This will
  provide a better understanding of the physical
  properties of the sedimentary rocks giving rise
  to the seismic features observed.

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Main Points of Interest

• Clay Diagenesis as a function of temperature.
• Influence of volcanic sediments in terms of
  diagenesis and seismic response.
• Carbonate and biogenic silica content and their
  influence on log and seismic response.
• Grain size and clay mineral content (i.e. illite
  /kaolinite ratio) of shale facies may give
  indication of the distance to the clastic source
  and provide some indications of source area and
  the prediction of turbidite sand deposits.

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Methods

• XRD
• Extensive/detailed XRD analysis
• Over 500 samples
• Bulk clay mineralogy and detailed analysis of
  clay fraction
• XRF
• Major and trace element analysis
• SEM
• Element mapping, carbonate/biogenic input,
  micro-crystalline silica presence
• Biostratigraphy
• Micropaleontology and Palynology

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Objectives

• Produce an extensive dataset consisting of
  detailed mineralogical analyses and physical
  measurements of regularly spaced silt and clay
  samples from the Upper Cretaceous. This product
  may be used as input to each companies in-house
  calibration process (integration with electric
  log interpretation, log acoustic properties,
  etc.), hopefully enhancing seismic attribute
  analysis.
• Produce a stratigraphical and mineralogical model
  to help explain the distribution of sands and
  shales within deepwater depositional environment,
  which helps to explain observed and/or modelled
  features seen in the seismic data.
• Integrate results with parallel petrophysics,
  geophysics and basin modelling projects

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Integrate with other PEGG Projects