Abstract: Disclosed herein are systems and methods for calibrating seismic data using seismic attribute pairs such as amplitude versus offset (AVO) attributes. In one embodiment, a method includes: receiving traces from a seismic survey that covers a volume; determining a pair of seismic attributes for each of a plurality of positions within the volume (“survey pairs”); deriving pairs of seismic attributes from a source independent of the survey (“independent pairs”); calculating a rotation angle and one or more scale factors that calibrate the survey pairs relative to the independent pairs; and calibrating the traces with the rotation angle and the one or more scale factors. Thus, for example, the overall amplitude and relative AVO of pre-stack seismic gathers can be calibrated to match that of synthetic gathers by matching crossplots of AVO attributes generated from each dataset.

Abstract: A computer-operated method for analyzing seismic data to discern the presence of hydrocarbon-bearing formations is disclosed. According to the disclosed method and system, amplitude-versus-offset (AVO) analysis is performed to assign, for each depth point in a survey region, an AVO intercept value and an AVO gradient value; the AVO intercept value corresponds to the zero-offset response for acoustic reflections from the depth point, while the AVO gradient value corresponds to the rate of change of the amplitude as a function of the angle of incidence of the acoustic energy (typically, with the square of the sine of the angle).