ABSTRACT
MODELING OF CARBON DIOXIDE SEQUESTRATION
IN A DEEP SALINE AQUIFER
BASBUg, BaSar
M.S., Department of Petroleum and Natural Gas Engineering
Supervisor : Prof. Dr. Fevzi Gü / mrah
July 2005, 245 pages
CO2 is one of the hazardous greenhouse gases causing significant changes in the
environment. The sequestering CO2 in a suitable geological medium can be a feasible
method to avoid the negative effects of CO2 emissions in the atmosphere. CO2
sequestration is the capture of, separation, and long-term storage of CO2 in
underground geological environments.
A case study was simulated regarding the CO2 sequestration in a deep saline aquifer.
The compositional numerical model (GEM) of the CMG software was used to study
the ability of the selected aquifer to accept and retain the large quantities of injected
CO2 at supercritical state for long periods of time (200 years). A field-scale model
with two injectors and six water producers and a single-well aquifer model cases were
studied.
In a single-well aquifer model, the effects of parameters such as vertical to horizontal
permeability ratio, aquifer pressure, injection rate, and salinity on the sequestration
process were examined and the sensitivity analyses were performed after simulating
the field-scale model.
The supercritical CO2, one-state fluid which exhibits both gas and liquid-like
properties, and gaseous CO2 were sequestered in the forms of free CO2 bubble,
dissolved CO2 in brine and precipitated CO2 with calcite mineral in a deep saline
aquifer. The isothermal condition was assumed during injection and sequestration
processes. The change in porosity and permeability values that might have occurred
due to mineralization and CO2 adsorption on rock were not considered in this study.
Vertical to horizontal permeability ratio and initial pressure conditions were the most
dominating parameters affecting the CO2 saturation in each layer of the aquifer
whereas CO2 injection rate influenced CO2 saturation in middle and bottom layers
since CO2 was injected through bottom layer.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12606244/index.pdf |
| Date | 01 July 2005 |
| Creators | Basbug, Basar |
| Contributors | Gumrah, Fevzi |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
Page generated in 0.0018 seconds