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| Titel |
Comparison of long-term numerical simulations at the Ketzin pilot site using the Schlumberger ECLIPSE and LBNL TOUGH2 simulators |
| VerfasserIn |
T. Kempka, B. Norden, E. Tillner, B. Nakaten, Mich. Kühn |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064201
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| Zusammenfassung |
| Geological modelling and dynamic flow simulations were conducted at the Ketzin pilot site
showing a good agreement of history matched geological models with CO2 arrival times in
both observation wells and timely development of reservoir pressure determined in the
injection well.
Recently, a re-evaluation of the seismic 3D data enabled a refinement of the structural site
model and the implementation of the fault system present at the top of the Ketzin anticline.
The updated geological model (model size: 5 km x 5 km) shows a horizontal discretization of
5 x 5 m and consists of three vertical zones, with the finest discretization at the top (0.5 m).
According to the revised seismic analysis, the facies modelling to simulate the channel and
floodplain facies distribution at Ketzin was updated. Using a sequential Gaussian simulator
for the distribution of total and effective porosities and an empiric porosity-permeability
relationship based on site and literature data available, the structural model was
parameterized.
Based on this revised reservoir model of the Stuttgart formation, numerical simulations
using the TOUGH2-MP/ECO2N and Schlumberger Information Services (SIS) ECLIPSE
100 black-oil simulators were undertaken in order to evaluate the long-term (up to 10,000
years) migration of the injected CO2 (about 57,000 t at the end of 2011) and the development
of reservoir pressure over time. The simulation results enabled us to quantitatively
compare both reservoir simulators based on current operational data considering
the long-term effects of CO2 storage including CO2 dissolution in the formation
fluid.
While the integration of the static geological model developed in the SIS Petrel modelling
package into the ECLIPSE simulator is relatively flawless, a work-flow allowing for the
export of Petrel models into the TOUGH2-MP input file format had to be implemented within
the scope of this study. The challenge in this task was mainly determined by the presence of a
complex faulted system in the revised reservoir model demanding for an integrated concept to
deal with connections between the elements aligned to faults in the TOUGH2-MP simulator.
Furthermore, we developed a methodology to visualize and compare the TOUGH2-MP
simulation results with those of the Eclipse simulator using the Petrel software
package.
The long-term simulation results of both simulators are generally in good agreement.
Spatial and timely migration of the CO2 plume as well as residual gas saturation are
almost identical for both simulators, even though a time-dependent approach of CO2
dissolution in the formation fluid was chosen in the ECLIPSE simulator. Our results
confirmed that a scientific open-source simulator as the TOUGH2-MP software
package is capable to provide the same accuracy as the industrial standard simulator
ECLIPSE 100. However, the computational time and additional efforts to implement a
suitable workflow for using the TOUGH2-MP simulator are significantly higher, while
the open-source concept of TOUGH2 provides more flexibility regarding process
adaptation. |
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