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2011 (Vol. 3, Issue: 01)
Article Information:

Effective Stress-Porosity Relationship above and Within the Oil Window in the North Sea Basin

K.S. Okiongbo
Corresponding Author:  Kenneth S. Okiongbo 

Key words:  Compaction coefficient, effective stress, mudstone, North Sea, pore pressure, porosity,
Vol. 3 , (01): 32-38
Submitted Accepted Published
2010 September, 03 2010 November, 27 2011 January, 20

This study investigates the effective stress - porosity relationship above and within the oil window in the Kimmeridge Clay Formation (KCF) in the North Sea Basin (UK) using effective stress and porosity determined from wireline logs and pore pressure data. Porosity was determined from an empirical porosity - sonic transit - time transform, calibrated using shale and mudstone core porosity measurements from Jurassic shales in the North Sea. Effective stress was determined from the total overburden stress and pore pressure. The total overburden stress was calculated by integration of the density log. The results show that porosity range between ~11-20% in the pre-generation zone but decreased to <5% within the oil window. Compaction coefficient ($) values above the oil window vary from ~0.08-0.09 M/Pa, but vary from ~0.05-0.06 M/Pa within the oil window implying that deeper burial and a high degree of chemical precipitation and cementation has created a stiff matrix giving rise to low $ values. The effective stress-porosity relationship above and within the oil window reflects a possible decrease in effective stress occasioned by increase in porosity in the pregeneration zone.
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  Cite this Reference:
K.S. Okiongbo, 2011. Effective Stress-Porosity Relationship above and Within the Oil Window in the North Sea Basin.  Research Journal of Applied Sciences, Engineering and Technology, 3(01): 32-38.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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