Amplitude-versus-offset (AVO) attribute analysis becomes a defact-standard technique for the contemporary hydrocarbon exploration. A basic product for this analysis is angle sub stacks, such as so-called near and far, and sometime middle in order to evaluate an amplitude change along offset or incident angle. Detail study of AVO interpretation is facilitated by crossplotting AVO intercept (P0) and gradient (G) under Shuey’s two term approximation. Further elastic attributes are derived basically from those P0 and G. Estimation of the P0 and G is normally derived via least-square fit of a prestack-migrated seismic gather, which is transformed from offset into incident angle. A partial stack technique is commonly introduced to enhance signal-to-noise ratio (S/N) anticipating better estimation. This ultimate case of the partial stack is the angle sub stack utilizing for amplitude study at an interpretation. In this paper, we are using synthetic and real seismic data contaminated by Gaussian noise to demonstrate that P0 and G estimation based on angle sub stacks is as reliable as computed on a full gather. This implies our standard interpretation data in our hands will be enough for in-house calculation of P0 and G, which can be done by an interpretation workstation, and this contributes budget saving for further P0 and G based processing.


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