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Abstract
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Article Information:
Petrophysical Properties of North Sea Shales
K.S. Okiongbo
Corresponding Author: Kenneth S. Okiongbo
Submitted: 2010 November, 25
Accepted: 2010 December, 18
Published: 2011 January, 20 |
Abstract:
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This study presents a data set comprising estimated permeabilities of 22 natural mudstones which
also have been characterised in terms of their pore size distribution, porosity, grain density and Total Organic
Carbon (TOC) content. Pore size distribution and grain density were determined using mercury porosimetry
and pycnometer method. TOC was determ ined by direct combustion of the organic carbon in LECO RLS-100
Carbon Sulphur analyser. Permeabilities were estimated based on the measured pore throat size distribution plus
assumed pore alignment and pore shape using the model of Yang and Aplin. TOC and grain density ranges from
3.44- 9.98% and 2.61-2.70 g/cm3, respectively. Porosity decreases from ~24-3% between the depth range of
1515-4781 m. The pore size distribution data show that the m ean pore radius decreases from ~36-2 nm within
the same depth range, the shift to smaller mean pore radii is driven primarily by the collapse of pores larger than
10nm with increase in consolidation. These values represent some of the smallest pore sizes known for rocks
and in part provide a qualitative explanation for the low shale permeabilities. Estimated vertical permeabilities
range from 9.5×10-23 to 8.6×10-21 m2. In general, permeability decreases logarithmically with porosity.
Key words: Grain density, permeability, porosity, pore-size distribution, shales, total organic carbon,
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Cite this Reference:
K.S. Okiongbo, . Petrophysical Properties of North Sea Shales. Research Journal of Applied Sciences, Engineering and Technology, (01): 46-52.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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