Fractured Reservoir Characterization using Azimuthal AVO
Author(s)
Minsley, Burke J.
Burns, Daniel R.
Willis, Mark E.
Date Issued
2003
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;2003-09
Abstract
Ordinary least squares is used to investigate the ability to detect changes in physical properties
using Amplitude Versus Offset (AVO) information collected from seismic data. In order to characterize
vertically aligned fractures within a reservoir, this method is extended to Azimuthal AVO (AVOA)
analysis. Azimuthal AVO has the potential not only to detect fractured zones, but to spatially describe the
fracture strike orientation and changes in fracture or fluid properties. Depending on the data acquisition
geometry, signal-to-noise ratio, and extent of fracturing, AVOA analysis can be marginally successful. A
study of the robustness and limitations of AVOA analysis is therefore first classified with synthetic data.
These methods are then applied to seismic data collected during an Ocean Bottom Cable (OBC) survey
over a known fractured reservoir.
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