Improvement of Gas Reservoir Detection from AVO Analysis in Time-frequency Domain

Abstract

AVO (amplitude variation with offset) analysis is an effective technique to detect hydrocarbon reservoirs especially gas reservoirs. Based on the AVO theory, fluid content of formation cause changes to amplitude versus offset. Unlike common works which AVO analysis is performed in time domain, we want to use AVO in time-frequency domain based on the cross-plot of time-frequency characteristics of far and near offsets. In this study we have improved the resolution of the AVO by proposing two methods. First we have used reduced interference distribution (RID) which is one of the effective time-frequency distributions, second we have registered high and low frequency slices and considered joint segments.