It is common to build static models of reservoirs on the basis of simple algebraic combinations of well-log data within a structural framework. However, large errors can occur in estimating volumetrics. Also, a biased estimate of uncertainty is produced that can distort the quantitative assessment of the risks involved in field development. Seismic data can be used at various levels of sophistication to guide the interpolation of log data between wells to provide more realistic static models. The most effective way to include the seismic data is through the construction of impedance models derived from seismic inversion and geological modeling.