| Type of Document |
Master's Thesis |
| Author |
Fahrman, Benjamin Paul
|
| URN |
etd-12192011-153230 |
| Title |
Geophone Array Optimization for Monitoring Geologic Carbon Sequestration using Double-Difference Tomography |
| Degree |
Master of Science |
| Department |
Mining and Minerals Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Westman, Erik Christian |
Committee Chair |
| Karfakis, Mario G. |
Committee Member |
| Luxbacher, Kramer Davis |
Committee Member |
|
| Keywords |
- Passive Seismic Double-Difference Tomography
- Geologic Carbon Sequestration
- Synthetic Data
|
| Date of Defense |
2011-12-05 |
| Availability |
unrestricted |
Abstract
Analysis of synthetic data was performed to determine the most cost-effective tomographic monitoring system for a geologic carbon sequestration injection site. Artificial velocity models were created that accounted for the expected velocity decrease due to the existence of a CO2 plume after underground injection into a depleted petroleum reservoir. Seismic events were created to represent induced seismicity from injection, and five different geophone arrays were created to monitor this artificial seismicity. Double-difference tomographic inversion was performed on 125 synthetic data sets: five stages of CO2 plume growth, five seismic event regions, and five geophone arrays. Each resulting velocity model from tomoDD—the double-difference tomography program used for inversion—was compared quantitatively to its respective synthetic velocity model to determine an accuracy value. The quantitative results were examined in an attempt to determine a relationship between cost and accuracy in monitoring, verification, and accounting applications using double-difference tomography. While all scenarios resulted in little error, no such relationship could be found. The lack of a relationship between cost and error is most likely due to error inherent to the travel time calculation algorithm used.
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| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
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Fahrman_BP_T_2011.pdf |
1.33 Mb |
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