He, Y-X, Angus, DA, Yuan, SY et al. (1 more author) (2015) Feasibility of time-lapse AVO and AVOA analysis to monitor compaction-induced seismic anisotropy. Journal of Applied Geophysics, 122. 134 - 148. ISSN 0926-9851
Abstract
Hydrocarbon reservoir production generally results in observable time-lapse physical property changes, such as velocity increases within a compacting reservoir. However, the physical property changes that lead to velocity changes can be difficult to isolate uniquely. Thus, integrated hydro-mechanical simulation, stress-sensitive rock physics models and time-lapse seismic modelling workflows can be employed to study the influence of velocity changes and induced seismic anisotropy due to reservoir compaction. We study the influence of reservoir compaction and compartmentalization on time-lapse seismic signatures for reflection amplitude variation with offset (AVO) and azimuth (AVOA). Specifically, the time-lapse AVO and AVOA responses are predicted for two models: a laterally homogeneous four-layer dipping model and a laterally heterogeneous graben structure reservoir model. Seismic reflection coefficients for different offsets and azimuths are calculated for compressional (P–P) and converted shear (P–S) waves using an anisotropic ray tracer as well as using approximate equations for AVO and AVOA. The simulations help assess the feasibility of using time-lapse AVO and AVOA signatures to monitor reservoir compartmentalization as well as evaluate induced stress anisotropy due to changes in the effective stress field. The results of this study indicate that time-lapse AVO and AVOA analysis can be applied as a potential means for qualitatively and semi-quantitatively linking azimuthal anisotropy changes caused by reservoir production to pressure/stress changes.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 Elsevier B.V. All rights reserved. This is an author produced version of a paper published in Journal of Applied Geophysics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Time-lapse seismic analysis; Reservoir compaction; Hydro-mechanical simulation; Seismic anisotropy; Azimuthal AVO |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Oct 2015 13:10 |
Last Modified: | 31 Oct 2016 17:40 |
Published Version: | http://dx.doi.org/10.1016/j.jappgeo.2015.09.010 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jappgeo.2015.09.010 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:90126 |