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Elastic depth trends are an integral component of reservoir characterization whether explicitly or implicitly constructed. Applications for seismic data include migration velocity model building, inversion and AVO prospecting. In practice, workflows often involve fitting well logs with smooth curves, without reference to known lithologydependent templates that could provide realistic constraints. We construct porosity-depth trends for shales and sandstones with reference to measurements from literature that spawn both mechanical compaction and chemical diagenesis domains. These porosity trends are then used as inputs to well-known rock physics models to estimate the median and bounding trends for acoustic and shear impedance. The resulting modeling has shown an important sensitivity to the pore pressure regime, among other variables. AVO predictions made from these trends provide a useful reference frame for anomaly prediction with depth.
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