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| Titel |
A workflow for building and calibrating 3-D geomechanical models – a case study for a gas reservoir in the North German Basin |
| VerfasserIn |
K. Fischer, A. Henk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 4, no. 2 ; Nr. 4, no. 2 (2013-10-15), S.347-355 |
| Datensatznummer |
250084937
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| Publikation (Nr.) |
 copernicus.org/se-4-347-2013.pdf |
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| Zusammenfassung |
| The optimal use of conventional and unconventional hydrocarbon reservoirs
depends, amongst other things, on the local tectonic stress field. For example,
wellbore stability, orientation of hydraulically induced fractures and –
especially in fractured reservoirs – permeability anisotropies are
controlled by the present-day in situ stresses. Faults and lithological
changes can lead to stress perturbations and produce local stresses that can
significantly deviate from the regional stress field. Geomechanical
reservoir models aim for a robust, ideally "pre-drilling" prediction of
the local variations in stress magnitude and orientation. This requires a
numerical modelling approach that is capable to incorporate the specific
geometry and mechanical properties of the subsurface reservoir. The workflow
presented in this paper can be used to build 3-D geomechanical models based
on the finite element (FE) method and ranging from field-scale models to
smaller, detailed submodels of individual fault blocks. The approach is
successfully applied to an intensively faulted gas reservoir in the North
German Basin. The in situ stresses predicted by the geomechanical FE model
were calibrated against stress data actually observed, e.g. borehole
breakouts and extended leak-off tests. Such a validated model can provide
insights into the stress perturbations in the inter-well space and undrilled
parts of the reservoir. In addition, the tendency of the existing fault
network to slip or dilate in the present-day stress regime can be addressed. |
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