• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Earth Science
  • Department of Earth Science
  • View Item
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Earth Science
  • Department of Earth Science
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Experimental investigation of deformation mechanisms during shear-enhanced compaction in poorly lithified sandstone and sand

Skurtveit, Elin; Torabi, Anita; Gabrielsen, Roy H.; Zoback, Mark D.
Peer reviewed, Journal article
Published version
Thumbnail
View/Open
jgrb50342.pdf (7.142Mb)
URI
https://hdl.handle.net/1956/8527
Date
2013-08-27
Metadata
Show full item record
Collections
  • Department of Earth Science [651]
Original version
https://doi.org/10.1002/jgrb.50342
Abstract
Shear-enhanced compaction in shallow sandstone reservoirs has been investigated in laboratory experiments using high-pressure triaxial testing of poorly lithified sandstone and sand. We have studied the deformation mechanism involved during shear-enhanced compaction and controlling parameters for yield stress at varying confining pressures for sandstone/sand with different grain sizes, porosities, and packing. Experimental testing provides insights into the deformation mechanism during hydrostatic and axial compression of coarse- and fine-grained sands with different packing including (1) natural coarse-grained sandstone, (2) densely packed fine-grained sand, and (3) loosely packed fine-grained sand. Monitoring of deformation and ultrasonic velocity during deformation indicates porosity loss, compaction, and strain hardening for most of the samples. Visualization of deformation using pretest and posttest X-ray imaging and thin sections demonstrates localized deformation fabrics and grain damage. The results show grain rearrangement as the controlling deformation mechanism for material at low stress and high porosity, whereas for lower porosity and higher stress, grain fracturing controlled the deformation. The most pronounced localization of deformation was observed for the coarse-grained, low-porosity material. A Cam-Clay cap model was used to describe the porosity loss during compaction and shear-enhanced compaction, demonstrating large inelastic compaction with increasing confining pressure. Yield stress and end caps for poorly lithified sandstone are observed for various porosities and stress conditions and found to be lower than predicted using empirical relationships for sandstone.
Publisher
Wiley
Journal
Journal of Geophysical Research: Solid Earth
Copyright
Copyright 2013 American Geophysical Union. All Rights Reserved.

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit