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PP-PS joint inversion and horizon mapping analysis of the 3D3C multicomponent dataset of Bandurria Norte, Argentina

Summary The focus of this study was to perform an enhanced characterization of the unconventional play of the Vaca Muerta formation. In 2017 a multicomponent test survey was acquired over an area of about 13km² with the aim of reliable fraction and rock elasticity information to reduce uncertainty of this shale oil development project. To test this concept, we employed a joint inversion method developed by Hampson et al. (2005) and Russell et al. (2005) that makes use of the compressional wave (PP) and the shear wave (PS) components. PP/PS Post-Stack joint inversion delivered straightforward and fast results for P- and S- impedance and gave enhanced insights into the elastic properties of the formation. Comparing horizons picked in PP and PS time provided fast insight and helped in identifying a subtle fault that can have a significant impact on later development stages. On the Vp/Vs ratio dataset, a result from the joint inversion, low values in upper part of lower Vaca Muerta formation were observed. These values could reflect zones of overpressure which can be caused by leak-off of pressure through the underlying Tordillo formation. Another possible explanation might be that this low Vp/Vs values reflect zones of higher organic content.