Title page for ETD etd-12192011-153230

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
  • Passive Seismic Double-Difference Tomography
  • Geologic Carbon Sequestration
  • Synthetic Data
Date of Defense 2011-12-05
Availability unrestricted
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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