ESEM study of authigenic chlorite acid sensitivity in sandstone reservoirs

Baker, J. C., Uwins, P. J. R., & Mackinnon, Ian D. R. (1993) ESEM study of authigenic chlorite acid sensitivity in sandstone reservoirs. Journal of Petroleum Science and Engineering, 8(4), pp. 269-277.

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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. © 1993.

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ID Code: 57485
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996): 10
Export Date: 19 February 2013
Source: Scopus
Language of Original Document: English
Correspondence Address: Baker, J.C.; Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD 4072, Australia
Keywords: authigenic mineral, chlorite, reservoir rock, sandstone, ESEM, Acidization, Chlorite minerals, Hydrochloric acid, Oil well production, Acid treatment, Chlorite acid sensitivity, Sandstone reservoirs, Petroleum reservoirs
DOI: 10.1016/0920-4105(93)90004-X
ISSN: 0920-4105
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Petroleum and Coal Geology (040309)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > RESOURCES ENGINEERING AND EXTRACTIVE METALLURGY (091400) > Petroleum and Reservoir Engineering (091406)
Divisions: Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 1993 Elsevier Science BV
Deposited On: 27 Feb 2013 04:07
Last Modified: 27 Feb 2013 04:07

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