He, Y, Angus, DAC orcid.org/0000-0003-0734-7835, Clark, RA orcid.org/0000-0002-3508-8183 et al. (1 more author) (2016) Analysis of time‐lapse travel‐time and amplitude changes to assess reservoir compartmentalization. Geophysical Prospecting, 64 (1). pp. 54-67. ISSN 0016-8025
Abstract
Fluid depletion within a compacting reservoir can lead to significant stress and strain changes and potentially severe geomechanical issues, both inside and outside the reservoir. We extend previous research of time-lapse seismic interpretation by incorporating synthetic near-offset and full-offset common-midpoint reflection data using anisotropic ray tracing to investigate uncertainties in time-lapse seismic observations. The time-lapse seismic simulations use dynamic elasticity models built from hydro-geomechanical simulation output and a stress-dependent rock physics model. The reservoir model is a conceptual two-fault graben reservoir, where we allow the fault fluid-flow transmissibility to vary from high to low to simulate non-compartmentalized and compartmentalized reservoirs, respectively. The results indicate time-lapse seismic amplitude changes and travel-time shifts can be used to qualitatively identify reservoir compartmentalization. Due to the high repeatability and good quality of the time-lapse synthetic dataset, the estimated travel-time shifts and amplitude changes for near-offset data match the true model subsurface changes with minimal errors. A 1D velocity–strain relation was used to estimate the vertical velocity change for the reservoir bottom interface by applying zero-offset time shifts from both the near-offset and full-offset measurements. For near-offset data, the estimated P-wave velocity changes were within 10% of the true value. However, for full-offset data, time-lapse attributes are quantitatively reliable using standard time-lapse seismic methods when an updated velocity model is used rather than the baseline model.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 European Association of Geoscientists & Engineers. This is the peer reviewed version of the following article: He, Y.-X., Angus, D.A., Clark, R.A. and Hildyard, M.W. (2016), Analysis of time-lapse travel-time and amplitude changes to assess reservoir compartmentalization. Geophysical Prospecting, 64: 54–67. doi: 10.1111/1365-2478.12250, which has been published in final form at http://dx.doi.org/10.1111/1365-2478.12250. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
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: | 09 Jan 2015 14:44 |
Last Modified: | 28 Aug 2020 10:43 |
Published Version: | http://dx.doi.org/10.1111/1365-2478.12250 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1111/1365-2478.12250 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:82323 |