Geophysical Research at UBC

An overview of research in geophysics happening at the Geophysical Inversion Facility, including developments on SimPEG (http://simpeg.xyz)

Transcript

1. Geophysical Research at UBC Lindsey Heagy, Seogi Kang & Rowan Cockett Geophysical Inversion Facility University of British Columbia http://gif.eos.ubc.ca/
2. Geophysics!!
3. Geophysics!! 1. Physical Property Contrast 2. Survey Sensitive to Contrast 3. Interpret / Invert the data
4. Propped Microseismic 2. Electromagnetic Survey 1. Electrically Conductive Proppant 3. Interpret / Invert the data Monitoring Fractures
5. Monitoring Fractures
6. Monitoring Fractures
7. Moving between spaces: Inversions
8. Inversion Methodology
9. Where are the currents? DC experiment http://www.3ptscience.com/app/DCresistivity
10. Seaing Seewater Intrusions EM inversions
11. Hydrologic problem We want to know the distribution of intruded seawater saturation (This is C alifornia!)
12. Forward problem: Ground Loop EM dM Conventional ➔ Time domain EM (TEM) ➔ 1D inversion (conventional) Why not? ➔ Frequency domain EM ➔ Multi-dimensional inversion
13. 1D stitched and 2.5D inversion
14. 3D inversion
15. Possible 3D seawater distribution
16. How we do things.
17. Fluid Flow (Vadose Zone)
18. Fluid Flow (Vadose Zone)
19. Saturation over time.
20. Where we are going...
21. Monitoring Exploration Electromagnetics Induced Polarization Direct Current Resistivity Magnetotellurics Survey Design Fluid Flow Physics Simulation Discretization Optimization Integrating information Visualization Education Things & Stuff
22. Our questions. What are the challenges that you face? - exploration? - monitoring? Where might geophysics fit in? - physical properties & contrasts? Where has geophysics been useful? or not? why?
24. Messages 3D inversions are very non-unique problem ➔ Not “one-click” but iterative procedures We need flexibility on our model parameters ➔ Can be realized by mapping function:
25. What is model? Forward responses: Sensitivity function: Mapping function:
26. Anomalous responses Optimal parameters: ➔ 0.1-10 ms; 1-100 Hz (t and f) ➔ 0-200 m (distance from the center)