Laboratory-scale study of fluid-rock interaction in the enhanced geothermal systems in cooper Basin, South Australia

Gideon B. Kuncoro, Yung Ngothai, Brian O'Neill, Allan Pring, Joël Brugger, Norio Yanagisawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

A study of fluid-rock interaction is essential to determine the chemical changes and mineral alteration in Enhanced geothermal system. Preliminary mineralogical investigation and geothermal experiments have been performed to investigate the hydrothermal alteration of the Habanero 3 well in the Cooper Basin, South Australia. Samples of drill cuttings from a borehole 5 km deep were reacted with pure water (reverse osmosis treated) in a titanium geothermal cell at 250°C and approximately 45 bar. Fluid and rock samples were analysed prior to, and after circulation of the water through crushed samples of the rock (100 - 200 μm diameter) for 1, 2, 4, 7, 14 and 28 days. Water analyses were undertaken using inductively coupled plasma mass spectrometry (ICP-MS) and heteropoly blue method tor silica analysis, and rock analyses were conducted using scanning electron microscopy (SEM), x-ray diffraction (XRD) and x-ray fluorescence (XRF). Experimental results showed that mineral dissolution was rapid in the early stages of the experiment. This may be a consequence of the dissolution of smaller rock particles and dissolution of more soluble mineral phases. SEM observations showed evidence of etching of the mineral surfaces consistent with partial dissolution. SEM backscattered images reveals that the quartz phase (SiO2) had little or no alteration after 28 days of circulation. XRF and XRD results complement this finding, that quartz was most stable throughout the experiment, and that the albite-feldspar (NaAlSi 3O8) and microcline (KAlSi3O8) in the rock had partially dissolved. As well, ICP-MS analysis of water samples confirmed that some mineral dissolution occurred. Determination of the dissolution kinetics of the various minerals phase is being undertaken.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
Pages642-646
Number of pages5
Publication statusPublished - 1 Dec 2010
Externally publishedYes
EventGeothermal Resources Council Annual Meeting 2010, Geothermal 2010 - Sacramento, CA, United States
Duration: 24 Oct 201027 Oct 2010

Publication series

NameTransactions - Geothermal Resources Council
Volume34 2
ISSN (Print)0193-5933

Conference

ConferenceGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
CountryUnited States
CitySacramento, CA
Period24/10/1027/10/10

Keywords

  • Cooper Basin
  • Flow-through cell
  • Fluid-rock interaction
  • Geothermal
  • Habanero
  • Hot fractured rock
  • Thermosyphon

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  • Cite this

    Kuncoro, G. B., Ngothai, Y., O'Neill, B., Pring, A., Brugger, J., & Yanagisawa, N. (2010). Laboratory-scale study of fluid-rock interaction in the enhanced geothermal systems in cooper Basin, South Australia. In Geothermal Resources Council Annual Meeting 2010, Geothermal 2010 (pp. 642-646). (Transactions - Geothermal Resources Council; Vol. 34 2).