An experimental study on mechanical behaviour of siltstone under brine saturation

W.A.M. Wanniarachchi, P.G. Ranjith, M.S.A. Perera, J. Zhao, M. H N D P Wickramarathne

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Hydro-fracturing process depends on many surrounding factors including overburden stress, confinement, injection flow rate, strength of rock, saturation medium, degree of saturation and mineral composition of the rock. Apart from these, in-situ mechanical properties of the reservoir also highly influences the fracking process, which however may significantly vary with the pore fluid concentration due to the associated brine-rock interactions creating rock structure re-arrangements. This study has therefore been aimed to investigate the effect of pore fluid (brine) concentration and degree of saturation on mechanical properties of tight reservoir rocks. Siltstone samples obtained from the Eidsvold in Queensland, were tested for unconfined compressive strength (UCS) after varyingly saturating them (03 brine concentrations; 10, 20 and 25% NaCl at 04 saturation levels; 25, 50, 75 and 100%). Findings indicate reducing trend of siltstone’s mechanical strength with increasing degree of saturation and an inverted U-shaped variation of siltstone’s strength with increasing NaCl concentration.

Original languageEnglish
Title of host publicationRock Mechanics and Rock Engineering: From the Past to the Future
Subtitle of host publicationProceedings of the 2016 ISRM International Symposium, Eurock 2016, Cappadocia, Turkey, 29-31 August 2016
EditorsResat Ulusay, Ömer Aydan, Hasan Gerçek, Mehmet Ali Hindistan, Ergün Tuncay
PublisherCRC Press
Number of pages5
ISBN (Electronic)9781315388496
ISBN (Print)9781138032651
Publication statusPublished - 2016
EventEuropean Rock Mechanics Symposium 2016 - Perissia Hotel & Convention Center, Ürgüp, Türkiye
Duration: 29 Aug 201631 Aug 2016 (Proceedings)

Publication series

NameISRM International Symposium - EUROCK 2016


ConferenceEuropean Rock Mechanics Symposium 2016
Abbreviated titleEUROCK 2016
OtherInternational Symposium on International Society for Rock Mechanics

EUROCK 2016 - the 2016 ISRM International Symposium
Internet address

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