Abstract
This paper presents two new approximations to Zoeppritz equations, together with new Direct Hydrocarbon Indicators (DHI) derived from them and plotting formats for displaying the DHIs. Theoretical calculation shows that the two approximations are of nearly the same accuracy as those employed in AVO technique. Theory in rock physics and field data processing support that the DHIs are more sensitive to gas accumulation than those employed by the current direct hydrocarbon detection technology and have better discrimination ability. The approximations, the DHIs and the plotting formats constitute a new way for utilizing amplitude-versus-offset information, which is named as Geomudulus method because elastic modulus parameters rather than seismic velocities are used. Case history is presented to support the effectiveness of Geomodulus method in gas exploration.
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