| Autor: |
Chris A. Legg, S. Mehran Hosseini, Fred Aminzadeh |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Day 3 Wed, October 02, 2013. |
| DOI: |
10.2118/166485-ms |
| Popis: |
Seismicity based reservoir characterization (SBRC) is a reservoir characterization method based on seismic events. This paper focuses on seismicity based permeability estimation which has been used in the oil and gas industry for more than a decade. However, the geomechanical processes behind this phenomenon have not been fully considered in the permeability estimation. A new model for SBRC based on radial pore pressure diffusion in the reservoir and Mohr-Coulomb failure criteria is proposed. This model includes reservoir stress state, fault friction coefficient and discontinuity orientations which were not included in the previously published models. Seismic data from the German Continental Deep Drilling Project (KTB) is used to test the validity of the new model. Our model predicts KTB's reservoir permeability to range between 10−17 to 10−16 m2, which perfectly matches the reported permeability in the literature for KTB and is bounded by the crust permeability limits measured in different studies worldwide. Based on the events front, reservoir discontinuity orientations can also be characterized. Sensitivity analyses of the effects of fault friction coefficient and geometry on estimated permeability showed significant dependency of the estimated permeability on the mentioned parameters. Previous SBRC models did not include permeability estimation dependency on reservoir geomechanical properties and reservoir discontinuity orientations. The new model captures the physics of microseismic activities due to fluid injection and includes geomechanical and reservoir discontinuity properties that were not included in previously published models. Using the new model, based on the events front, one can characterize the orientation of discontinuities that can be activated due to fluid injection which can be used as a new method for fracture network characterization in a fractured reservoir. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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