This is a porosity cross section generated with porosity logs and seismic impedance. A top and a base horizon markers are used. The seismic depth has been adjusted to match well logs. The seismic horizons are matched to the well markers. The seismic impedance is calibrated to porosity logs. The cokriging technique honors the well logs at well locations and weights both well data and seismic data in between wells. The variation between wells comes from the variation in seismic data. Usually there should be multiple iterations modifying the seismic picks and calibration. This section may still need more iteration.