ESEM study of authigenic chlorite acid sensitivity in sandstone reservoirs

Baker J.C., Uwins P.J.R. and Mackinnon I.D.R. (1993) ESEM study of authigenic chlorite acid sensitivity in sandstone reservoirs. Journal of Petroleum Science and Engineering, 8 4: 269-277. doi:10.1016/0920-4105(93)90004-X


Author Baker J.C.
Uwins P.J.R.
Mackinnon I.D.R.
Title ESEM study of authigenic chlorite acid sensitivity in sandstone reservoirs
Journal name Journal of Petroleum Science and Engineering   Check publisher's open access policy
ISSN 0920-4105
Publication date 1993
Sub-type Article (original research)
DOI 10.1016/0920-4105(93)90004-X
Volume 8
Issue 4
Start page 269
End page 277
Total pages 9
Subject 1909 Geotechnical Engineering and Engineering Geology
2103 Historical Studies
1900 Earth and Planetary Sciences
2300 Environmental Science
Abstract The effect of HCl on authigenic chlorite in three different sandstones has been examined uisng an Environmental Scanning Electron Microscope (ESEM), together with conventional analytical techniques. The ESEM enabled chlorites to be directly observed in situ at high magnifications during HCl treatment, and was particularly effective in allowing the same chlorite areas to be closely compared before and after acid treatment. Chlorites were reacted with 1M to 10M HCl at temperatures up to 80°C and for periods up to five months. After all treatments, chlorites show extensive leaching of iron, magnesium and aluminum, and their crystalline structure is destroyed. However, despite these major compositional and structural changes, chlorites show little or no visible evidence of acid attack, with precise morphological detail of individual plates preserved in all samples following acid treatments. Chlorite dissolution, sensu stricto, did not occur as a result of acidization of the host sandstones. Acid-treated chlorides are likely to exits in a structurally weakened state that may make them susceptible to physical disintegration during fluid flow. Accordingly, fines migration may be a significant engineering problem associated with the acidization of chlorite-bearing sandstones.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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