A (not so) shallow controlled CO2 release experiment in a fault zone

Karsten Michael, Arsham Avijegon, Ludovic Ricard, Matthew Myers, Konstantin Tertyshnikov, Roman Pevzner, Julian Strand, Allison Hortle, Linda Stalker, Marina Pervukhina, Brett Harris, Andrew Feitz, Bobby Pejcic, Alf Larcher, Praveen Rachakonda, Barry Freifeld, Mark Woitt, Laurent Langhi, Tess Dance, Jo MyersJennifer J. Roberts, Erdinc Saygin, Cameron White, Mojtaba Seyyedi

Research output: Working paper

Abstract

The CSIRO In-Situ Laboratory Project (ISL) is located in Western Australia and has two main objectives related to monitoring leaks from a CO2 storage complex by controlled-release experiments: 1) improving the monitorability of gaseous CO2 accumulations at intermediate depth, and 2) assessing the impact of faults on CO2 migration. A first test at the In-situ Lab has evaluated the ability to monitor and detect unwanted leakage of CO2 from a storage complex in a major fault zone. The ISL consists of three instrumented wells up to 400 m deep: 1) Harvey-2 used primarily for gaseous CO2 injection, 2) ISL OB-1, a fibreglass geophysical monitoring well with behind-casing instrumentation, and 3) a shallow (27 m) groundwater well for fluid sampling. A controlled-release test injected 38 tonnes of CO2 between 336-342 m depth in February 2019, and the gas was monitored by a wide range of downhole and surface monitoring technologies. CO2 reached the ISL OB-1 monitoring well (7 m away) after approximately 1.5 days and an injection volume of 5 tonnes. Evidence of arrival was determined by distributed temperature sensing and the CO2 plume was detected also by borehole seismic after injection of as little as 7 tonnes. Observations suggest that the fault zone did not alter the CO2 migration along bedding at the scale and depth of the experiment. No vertical CO2 migration was detected beyond the perforated injection interval; no notable changes were observed in groundwater quality or soil gas chemistry during and post injection. The early detection of significantly less than 38 tonnes of CO2 injected into the shallow subsurface demonstrates rapid and sensitive monitorability of potential leaks in the overburden of a commercial-scale storage project, prior to reaching shallow groundwater, soil zones or the atmosphere. The ISL is a unique and enduring research facility at which monitoring technologies will be further developed and tested for increasing public and regulator confidence in the ability to detect potential CO2 leakage at shallow to intermediate depth.
Original languageEnglish
Place of PublicationAmsterdam, Netherlands
Number of pages10
DOIs
Publication statusPublished - 6 Apr 2021

Publication series

NameProceedings of the 15th Greenhouse Gas Control Technologies Conference 15th-18th March 2021
PublisherSSRN
ISSN (Print)1556-5068

Keywords

  • CO2 controlled-release
  • Western Australia
  • CO2 geological storage
  • fault zone
  • CO2 monitoring

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  • CSIRO In Situ Lab

    Roberts, J.

    CSIRO

    1/11/181/06/19

    Project: Knowledge Exchange (Services/Consultancy)

  • CSIRO - Energy

    Jen Roberts (Visiting researcher)

    Jan 2019Mar 2019

    Activity: Visiting an external institution typesVisiting an external organisation

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