Purcell, Christopher
(2012)
VELOCITY MEASUREMENTS IN RESERVOIR ROCK SAMPLES FROM A LIMESTONE UNIT USING VARIOUS PORE FLUIDS, AND INTEGRATION WITH WELL LOGS AND SEISMIC DATA.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
One of the most promising methods proposed to mitigate excess global CO2 is carbon sequestration, a process in which CO2 is pressurized and injected into geologic formations. A technical challenge surrounding the geologic sequestration of CO2 is tracking the movement of the fluids pumped underground. Monitoring, verification and accounting activities related to CO2 storage are important for assuring that sequestered CO2 does not escape to the surface. Tracking this carbon dioxide can be considerably aided by reflection seismic-based detection methods. This thesis employs lab scale velocity measurements of core samples, under in situ reservoir pressure and temperature conditions, combined with multiple 3D reflection seismic surveys, to effectively track the movements of CO2 after injection.
The National Energy Technology Laboratory (NETL) of the United States Department of Energy began to participate in research of an enhanced oil recovery project including the injection of CO2 deep into a reservoir structure, repeat reflection seismic surveys, collection of well logs, and rock physics analysis of sample core material. Our study is concentrated on a small area of this field around the injection site. At this site, hydrocarbons were previously moved via water injection. We obtained ultrasonic elastic wave velocity measurements that were conducted under several different saturation scenarios, including CO2 saturated samples, so a quantification of the conditions in different parts of the reservoir could be determined.
This approach can help to characterize what is taking place inside the reservoir. Core-scale velocity measurements under in situ conditions allow us to predict changes in future well log or seismic surveys. The large amounts of CO2 accumulated over the past four decades in this reservoir give us a real world example of how an EOR site matures. Combining core scale, well log scale, and seismic scale measurements allows a better understanding of the various processes at work when CO2 is sequestered in a limestone reservoir.
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Details
Item Type: |
University of Pittsburgh ETD
|
Status: |
Unpublished |
Creators/Authors: |
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ETD Committee: |
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Date: |
9 October 2012 |
Date Type: |
Publication |
Defense Date: |
7 July 2012 |
Approval Date: |
9 October 2012 |
Submission Date: |
9 October 2012 |
Access Restriction: |
5 year -- Restrict access to University of Pittsburgh for a period of 5 years. |
Number of Pages: |
163 |
Institution: |
University of Pittsburgh |
Schools and Programs: |
Dietrich School of Arts and Sciences > Geology and Planetary Science |
Degree: |
PhD - Doctor of Philosophy |
Thesis Type: |
Doctoral Dissertation |
Refereed: |
Yes |
Uncontrolled Keywords: |
Carbon Sequestration, Climate, Carbonate Reservoir, Rock Physics, Seismic Monitoring, Enhanced Oil Recovery |
Date Deposited: |
09 Oct 2012 19:41 |
Last Modified: |
09 Oct 2017 05:15 |
URI: |
http://d-scholarship.pitt.edu/id/eprint/15805 |
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