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Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation

The electrical evaluation of reservoir rock needs to deem several factors that really describe a subsurface condition. As confining pressure can cause either pore space of the rock to collapse or rock properties to change, a detailed identification towards the extent of the pressure and water satura...

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Main Authors: Khairy, Hilfan, Harith, Zuhar Zahir Tuan
Format: Citation Index Journal
Published: Association of Korean Geoscience Societies and Springer 2011
Subjects:
QE Geology
Online Access:http://eprints.utp.edu.my/8286/1/Geosciences_Journal_Korea_%28accepted%29.pdf
http://eprints.utp.edu.my/8286/
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spelling my.utp.eprints.82862017-03-20T03:25:32Z Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation Khairy, Hilfan Harith, Zuhar Zahir Tuan QE Geology The electrical evaluation of reservoir rock needs to deem several factors that really describe a subsurface condition. As confining pressure can cause either pore space of the rock to collapse or rock properties to change, a detailed identification towards the extent of the pressure and water saturation effect on electrical properties is needed. This work is mainly focused on the investigations of electrical properties on shaly sandstones, encompassing the effects of pore geometries, confining pressure, and partial water saturation on electrical properties. Here, the frequency of electrical measurement is between 1 Hz and 0.2 MHz. It is indicated that an interfacial and geometry change due to pressure is easily recognized by imaginary resistivity in low water saturation, reflecting that confining pressure will affect only small defect to pore geometry. Meanwhile in high water saturation, bulk volume conductivity is more dominant, thus making interfacial contribution negligible. From petrographic analysis of this work it is found that only pore radius distribution has a good relationship with electrical dispersion. The relaxation time and its distribution are estimated by simultaneous inversion of real and imaginary resistivity. The Cole-Cole model inversion is applied to obtain these parameters. For this purpose, the integration of Lavenberg-Marquardt and Singular Value decomposition (SVD) are used in order to avoid singularity problems. The obtainment of decreasing of relaxation time with the increasing of confining pressure reflects the reduction of the internal surface area. Association of Korean Geoscience Societies and Springer 2011 Citation Index Journal PeerReviewed application/pdf http://eprints.utp.edu.my/8286/1/Geosciences_Journal_Korea_%28accepted%29.pdf Khairy, Hilfan and Harith, Zuhar Zahir Tuan (2011) Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation. [Citation Index Journal] http://eprints.utp.edu.my/8286/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic QE Geology
spellingShingle QE Geology
Khairy, Hilfan
Harith, Zuhar Zahir Tuan
Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
description The electrical evaluation of reservoir rock needs to deem several factors that really describe a subsurface condition. As confining pressure can cause either pore space of the rock to collapse or rock properties to change, a detailed identification towards the extent of the pressure and water saturation effect on electrical properties is needed. This work is mainly focused on the investigations of electrical properties on shaly sandstones, encompassing the effects of pore geometries, confining pressure, and partial water saturation on electrical properties. Here, the frequency of electrical measurement is between 1 Hz and 0.2 MHz. It is indicated that an interfacial and geometry change due to pressure is easily recognized by imaginary resistivity in low water saturation, reflecting that confining pressure will affect only small defect to pore geometry. Meanwhile in high water saturation, bulk volume conductivity is more dominant, thus making interfacial contribution negligible. From petrographic analysis of this work it is found that only pore radius distribution has a good relationship with electrical dispersion. The relaxation time and its distribution are estimated by simultaneous inversion of real and imaginary resistivity. The Cole-Cole model inversion is applied to obtain these parameters. For this purpose, the integration of Lavenberg-Marquardt and Singular Value decomposition (SVD) are used in order to avoid singularity problems. The obtainment of decreasing of relaxation time with the increasing of confining pressure reflects the reduction of the internal surface area.
format Citation Index Journal
author Khairy, Hilfan
Harith, Zuhar Zahir Tuan
author_facet Khairy, Hilfan
Harith, Zuhar Zahir Tuan
author_sort Khairy, Hilfan
title Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
title_short Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
title_full Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
title_fullStr Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
title_full_unstemmed Interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
title_sort interfacial, pore geometry and saturation effect on complex resistivity of shaly sandstone: dispersion and laboratory investigation
publisher Association of Korean Geoscience Societies and Springer
publishDate 2011
url http://eprints.utp.edu.my/8286/1/Geosciences_Journal_Korea_%28accepted%29.pdf
http://eprints.utp.edu.my/8286/
_version_ 1738655644369551360
score 13.211869

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