We have developed a method for joint inversion of PP and PS data with the goal of unique and accurate determination of important layer parameters, with particular focus on Vp/Vs ratios across reflection interfaces. These can be used in quantitative seismic interpretation for improved lithology and fluid discrimination. Our results show that by exploring the full Zoeppritz equation jointly for PP and PS reflectivities, instead of approximative equations, we obtain more accurate and unique estimates of Vp/Vs ratios. Moreover, the method gives reliable estimates of density ratio, a parameter that can be directly linked to hydrocarbon saturations.


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