ESEM study of illite/smectite freshwater sensitivity in sandstone reservoirs

Baker J.C., Uwins P.J.R. and Mackinnon I.D.R. (1993) ESEM study of illite/smectite freshwater sensitivity in sandstone reservoirs. Journal of Petroleum Science and Engineering, 9 2: 83-94. doi:10.1016/0920-4105(93)90069-Q

Author Baker J.C.
Uwins P.J.R.
Mackinnon I.D.R.
Title ESEM study of illite/smectite freshwater sensitivity in sandstone reservoirs
Journal name Journal of Petroleum Science and Engineering   Check publisher's open access policy
ISSN 0920-4105
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0920-4105(93)90069-Q
Open Access Status Not yet assessed
Volume 9
Issue 2
Start page 83
End page 94
Total pages 12
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
2103 Historical Studies
1900 Earth and Planetary Sciences
2300 Environmental Science
Abstract The water sensitivity of authigenic smectite- and illite-rich illite/smectites in sandstone reservoirs has been investigated using an Environmental Scanning Electron Microscope (ESEM). The ESEM enabled the illite/smectites to be directly observed in situ at high magnification during freshwater immersion, and was also particularly effective in allowing the same selected illite/smectite areas to be closely compared before and after freshwater treatments. The tendency of authigenic smectite-rich illite/smectite to swell on contact with fresh water varies greatly. Smectite-rich illite/smectite may osmotically swell to many times its original volume to form a gel which greatly reduces porosity and permeability, or may undergo only a subtle morphological change which has little or no adverse effect on reservoir quality. Authigenic illite-rich illite/smectite in sandstones does not swell when immersed in fresh water. Even after prolonged soaking in fresh water, illite-rich illite/smectite particles retain their original morphology. Accordingly, illite-rich illite/smectite in sandstones is unlikely to cause formation damage if exposed to freshwater-based fluids.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
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Created: Tue, 26 Jul 2016, 12:33:57 EST by System User