Direct Geostatistical Seismic Amplitude Versus Angle Inversion for Shale Rock Properties

The purpose of seismic reservoir characterization is to predict the spatial distribution subsurface rock properties from a set direct and indirect measurements. Commonly, property volumes are obtained in two-steps approach. First, elastic inverted reflection data then used compute by applying calibrated physics models. Such an approach not only time consuming but may also lead biased results as uncertainties related inversion be propagated through entire geomodeling workflow. Here, we propose iterative geostatistical shale AVA method invert directly for properties. workflow consists three main steps starting model generation brittleness, total organic carbon (TOC), porosity using stochastic sequential simulation cosimulation calculation volume shale. In following step, calculated based on self-consistent approximation. models synthetic data. final misfit between real part update parameter space. whole process repeated until minimum observed achieved. proposed successfully tested onshore Lower Paleozoic gas Northern Poland, predicted agree with those at blind-well location.