Collie Hub presentation groundwater issues


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The Groundwater and Storage interactions project arose out of a meeting on the shoulder of the Greenhouse Gas Technologies Conference in Amsterdam in 2010. It was decided to concentrate initially on the Australian Flagships projects. On 3 May 2011 Australian researchers and government agencies met and presented their work to date.

In these slides COLLIE HUB, Western Australia, present on Groundwater Issues

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Collie Hub presentation groundwater issues

  1. 1. COLLIE HUB PresentationGroundwater Issues 3 May 2011
  2. 2. THE CONCEPTCOLLIE HUB•Integrated industrial CO2geosequestration system•Storage within anidentified area• Red mud sequestration300,000 + tpa (Alcoa)• 2.4 mtpa Perdaman CO2• Potential for up to 7 mtpafor future powergeneration
  4. 4. Target formations • The target injection formation is the Lesueur Sandstone with a top depth of approximately 1300 metres. • The depths of injection will be approximately 2000 and 2500 metres. • The Eneabba Formation will be the upper, “sealing” formation • Modelling shows the CO2 just reaching the base Eneabba
  5. 5. CO2 Injectivity andDynamic Capacity OPTION 1 OPTION 2• Injection rate range: Single well Multiple well w/ dual completion w/ single completion • Base Myalup & top Wonnerup: 0.2 – 1 Mt/a/completion • Mid Myalup: 0.3 – 1 Mt/a/completion • Total: 0.9 – 1.7 Mt/a/well• CO2 contained volume (cumulative after 40 yrs of injection) : • Base Myalup & top Wonnerup: 110 - 150 Mt • Mid Myalup: 90 – 150 Mt • Total injection range: 200 – 260 Mt• Maximum pressure buildup of ~ 50 bar occurred across Darling fault, in Myalup and Wonnerup. Fault is still stable.
  6. 6. Dynamic Simulations• Target injection (40 yrs): 6 injectors• Completion consideration to optimize injection volume and manage containment risk: • Proximity to faults and well spacing • Rock quality distribution • Reservoir dip• Two potential injection zones identified: • Base Myalup/Top Wonnerup with lower containment risk • Mid Myalup with higher injectivity potential and higher containment risk due to the proximity to Eneabba: • Smaller injection intervals away from the Base Eneabba• Injection constraints: frac-pressure Darling Fault
  7. 7. Injection Intervals
  8. 8. 1000 yrs 1000 yrsDistance, m Distance, m Distance, m
  9. 9. CO2 Containment and TrappingMechanism• CO2 reaches base of Eneabba at 250 yrs• After shut-in, up dip• After 100 years shut-in: • mobile gas from 77% to 35%• After 1000 years shut-in: • Mobile gas: 10% • Residual / immobile gas: 60% • Dissolved gas: 30% Trapping mechanism in Base Scenario • * residual saturation 10-40%
  10. 10. Fault Seal Analysis •Fault Seal Analysis of bounding faults in the study area (Petrel): • Darling Fault – main bounding fault (considered sealing) • 4NS • 8EW •Fault / Fracture Reactivation • faults stable up to 110 bar overpressure 11
  11. 11. GSWA Harvey 1
  12. 12. Preparation Phase 2010 – 2012 Pre-Competitive• Further technical investigation of the Lesueur;• Commenced a community & stakeholder consultation process• Establishment of necessary legislative measures, approvals and easements; and• Development of the proposed commercial structure and arrangements to facilitate the development.
  13. 13. Groundwater Analysis • The main Perth domestic water supply aquifer is the Yarragadee Formation. • The area chosen is on a structural high where the Yarragadee has been eroded off. • Main water supply from irrigation and superficial formations. • The Cockleshell Gully Fm is saline • The Leederville Fm mainly saline. • Lesueur Sst is a confined saline aquifer
  14. 14. Thissectionerodedoff
  15. 15. New Seismic: note unconformity
  16. 16. COLLIE HUB AND WATERPrimary aim is not to isolate potential groundwater sources either above or below the injection depth• How will we ensure aquifers above injection zone are protected?• How will CO2 injection alter the water chemistry and rock chemistry?
  17. 17. Upper Aquifers• Leederville Fm – 1.5km above injection formation• Eneabba Fm consists of siltstones, mudstones and other “barrier” formations – need more data to prove this up in the area.• Need to set up monitoring regime with tracers, monitoring bores etc• Refine modelling with new data from seismic and GSWA Harvey 1 well.
  18. 18. Water Chemistry• Sampling program using MDT (Modular formation Dynamics Tester)• Core geochemistry XRD, SEM, Hylogger analyses
  19. 19. Conclusions • Collie Hub Project aware of resource conflict issues generally and groundwater specifically • Already taken steps to avoid Perth’s main groundwater source, the Yarragadee Fm • Data paucity means more acquisition necessary • Planning team for future work includes DoW • Monitoring essential
  20. 20. Thank you