Physics of Rocks for CO2 reservoir characterisation and monitoring - presentation by Angus Best of at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014
•
1 like•1,082 views
Physics of Rocks for CO2 reservoir characterisation and monitoring - presentation by Angus Best of at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014
Recommended
Recommended
More Related Content
Viewers also liked
Viewers also liked (16)
Similar to Physics of Rocks for CO2 reservoir characterisation and monitoring - presentation by Angus Best of at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014
Similar to Physics of Rocks for CO2 reservoir characterisation and monitoring - presentation by Angus Best of at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014 (20)
More from UK Carbon Capture and Storage Research Centre
More from UK Carbon Capture and Storage Research Centre (20)
Recently uploaded
Recently uploaded (20)
Physics of Rocks for CO2 reservoir characterisation and monitoring - presentation by Angus Best of at the UKCCSRC meeting Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage, 23 October 2014
- 1. UKCCSRC Bristol, 23 October 2014 UKCCSRC Bristol 23rd October 2014 Monitoring of the deep subsurface: leakage pathways – understanding and monitoring the mechanics of CO2 storage Physics of Rocks for CO2 reservoir characterisation and monitoring Angus Best Acknowledgements: Ismael Falcon, Laurence North, Jeremy Sothcott & Clive McCann National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom, angus.best@noc.ac.uk
- 2. UKCCSRC Bristol, 23 October 2014 • Physics of rocks • DiSECCS study • Fractured rock/seismic anisotropy – Pore fluid viscosity – Sw • New CO2 rig • New acoustic pulse tube Outline
- 3. UKCCSRC Bristol, 23 October 2014 • 58 papers • Seismic attenuation /velocity dispersion • Seismic anisotropy • Geomechanics • Microstructural models • Digital rock physics • Elastic properties • Joint elastic-electrical properties • Fluids and carbonates • Reservoir characterisation and monitoring Physics of Rocks
- 4. UKCCSRC Bristol, 23 October 2014 • Contrast reservoir styles – Sleipner (sand) – Snøhvit (sandstone) – In Salah (tight sandstone) DiSECCS Study & Geomechanics • Diagnostic Seismic toolbox for Efficient Control of CO2 Storage • BGS, NOC, Leeds, Edinburgh, Manchester • Statoil, BP
- 5. UKCCSRC Bristol, 23 October 2014 • Scale dependent • Grain alignment • Bedding fabric • Aligned fractures Images from Armstrong et al. 1994 Transverse Isotropy Seismic Anisotropy (In Salah example)
- 6. UKCCSRC Bristol, 23 October 2014 • NOC – lab experiments • BGS – theoretical models Pore fluid viscosity & anisotropy in fractured rocks Shear wave splitting (SWS)
- 7. UKCCSRC Bristol, 23 October 2014 Frequency dependent seismic anisotropy (Chapman Theory) Wave propagation at 30° to the fracture normal. Meso-scale fractures Meso-scale fractures Microcracks Microcracks P-waves S-waves (Chapman 2003) • Poro-visco-elastic model • Squirt flow • Attenuation • Velocity dispersion • Vertically fractured reservoirs • Multi-component seismics • Azimuthal VSPs • Fracture characterisation • Pore fluid detection
- 8. UKCCSRC Bristol, 23 October 2014 Chapman Model Chapman (2003), Geophysical Prospecting, 51, 369-379.
- 9. UKCCSRC Bristol, 23 October 2014 • P- & S-wave velocity and attenuation • Very accurate (± 0.3%, ± 0.1 dB/cm) • 400 – 900 kHz • Effective pressure up to 65 MPa • Rotating S-wave transducer Ultrasonic pulse-echo system Best, Sothcott & McCann (2007)
- 10. UKCCSRC Bristol, 23 October 2014 Synthetic sandstones with aligned cracks Leach out aluminium disks with acid Silica-cemented sand blocks
- 11. UKCCSRC Bristol, 23 October 2014 Rock property Value Grain size 120 μm Porosity 30 % Permeability 21 mDarcy Fracture density 0.0314 ± 0.0059 Ave fracture radius 2.91 ± 0.06 mm Ave fracture aspect ratio 0.0429 ± 0.0008 Octagonal sandstone samples
- 12. UKCCSRC Bristol, 23 October 2014 Model predictions Blank sample (no fractures) Anisotropic background Fractured sample Minimise errors in Thomsen weak anisotropy parameters: epsilon, gamma & delta SWS = 1.45% CD = 3.14% Tillotson et al (2014), Geophysical Prospecting, 62, 1238-1252.
- 13. UKCCSRC Bristol, 23 October 2014 Results - pore fluid viscosity SWS = 4.59% (1.45% + 3.14%) Tillotson et al (2014), Geophysical Prospecting, 62, 1238-1252.
- 14. UKCCSRC Bristol, 23 October 2014 Results – attenuation & Sw Blank Fractured Amalokwu et al (2014), Geophysical Journal International, 197, 943-947.
- 15. UKCCSRC Bristol, 23 October 2014 New CO2 rig (Falcon, North, Best) • THMC (Thermal-Hydro- Mechanical-Chemical)
- 16. UKCCSRC Bristol, 23 October 2014 New CO2 rig (Falcon, North, Best) 1 Ultrasonicpulse-echoBufferroad-topBufferroad-bottomElectrodesSampleσ3σ1Lateral strain gageAxial strain gage Static moduli vs Dynamic moduli
- 17. UKCCSRC Bristol, 23 October 2014 New CO2 rig (example data) 1
- 18. UKCCSRC Bristol, 23 October 2014 • Geophysics • Seabed gas quantification • CH4 & CO2 • Hydrates • P-waves 500 Hz – 10 kHz • Frequency-dependence • Samples 7 cm diameter, 50 cm long • 60 MPa fluid/confining • 4 to 100 degC • S-waves ~ 1 kHz • ERT • Sands, muds Greenhouse Gas Pulse Tube Sat. 5th July 2014
- 19. UKCCSRC Bristol, 23 October 2014 Greenhouse Gas Pulse Tube a)b) c)d) McCann et al (2014), Geophysical Prospecting, 62, 97-116. 1 – 10 kHz
- 20. UKCCSRC Bristol, 23 October 2014 Acoustic Bubble Resonance Anderson & Hampton (1980a, b) Recent theoretical developments: Leighton (2007) Kuhs et al (2004) Velocity Attenuation Bubble size distributions
- 21. UKCCSRC Bristol, 23 October 2014 • Need controlled lab studies to understand: – Seismic anisotropy in fractured porous rocks – Pore fluid viscosity effects – Gas saturation effects – Geomechanical response to CO2 injection – Validate theoretical models for application to reservoir characterisation & monitoring • Acoustic pulse tube studies – Seabed greenhouse gas quantification – Gas bubble resonance phenomena Conclusions