GEOL Thesis Qualifying and Comprehensive Exam - John OllmannThursday, September 14, 2017 - 1:30pm
Title: Velocity Model for CO2 Sequestration in the Southeastern United States Atlantic Continental Margin
The sequestration of carbon dioxide (CO2) is emerging as a major player in offsetting anthropogenic greenhouse gas emissions. Characterizing potential CO2 sequestration sites is vital to reducing the United States’ emissions. The goal of this research project, funded by the Department of Energy, is to estimate the CO2 storage potential for the Southeastern United States Atlantic Continental Margin. Previous studies find up to 16 Gt and 175 Gt of storage potential are estimated for the Upper Cretaceous and Lower Cretaceous formations, respectively. Considering 5.2 Gt of CO2 were emitted by the United States in 2016, significant storage potential is present in the Southeastern United States Atlantic Continental Margin.
Stratigraphic units have been picked in two-way-time depth and need to be converted to depths in feet. In order to produce a time-depth relationship, a velocity model must be constructed. The velocity model will be made using P-wave velocities from seismic reflection data. Semblance analysis will be used to pick the root-mean-square velocities on common midpoint gathers from selected seismic lines. Root-mean-square velocities are converted to interval velocities using Dix conversion. These interval velocities and picked seismic horizons in two-way-time are used to create the velocity model and calculate the depths of stratigraphic units in feet. Using this velocity model, the seismic reflection data can be presented in depth in order to estimate the thickness and storage potential of CO2 reservoirs inthe Southeastern United States Atlantic Continental Margin.