Program in Earth, Energy, and Environmental Sciences (EEES) Ph.D. Thesis/ Oral Defense for David Cameron
Title: Optimization and monitoring of geological carbon storage operations - by David A. Cameron
Program in Earth, Energy, and Environmental Sciences
Advisor: Louis Durlofsky
This talk comprises the public portion of the PhD dissertation defense from approximately 1:30pm - 2:30pm
Abstract: We develop and apply computational procedures for optimization and data-assimilation in carbon storage operations, with the goals of minimizing the risk of leakage, tracking the plume of injected CO2 and detecting leaks from pressure monitoring data. Gradient free optimization techniques including Hooke-Jeeves Direct Search, Particle Swarm Optimization and Generalized Pattern Search are used to minimize the various objective and misfit functions in several examples. A process denoted as brine cycling, whereby brine is produced from the bottom of the aquifer and re-injected at the top, is introduced and included in the optimizations. Data assimilation relies on the Karhunen-Loève expansion to represent the geology with few optimization variables. The key findings are: that reducing geological uncertainty is important for optimization, that monitoring wells can be used to reduce the error in estimates of plume location, and that pressure monitoring wells can be used to characterize leaks in the cap rock.