Azimuthal AVO (AVOA) has become a popular method of fracture detection in both carbonate and sandstone reservoirs. Previous methods often relied on stacking the multiazimuth data into offset and azimuth bins, often using only two azimuth sectors perpendicular to each other. This can mix the data over a significant azimuth range and does not allow for meaningful error estimates. Once the data have been stacked into azimuth bins, information on azimuthal distribution is lost. Each azimuth sector is treated as if it has equal weight, even though one sector may have significantly lower fold and thus a lower signal-to-noise ratio....

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