Abstract：Using current geology data and reservoir data near the drill bit, geosteering can adjust horizon well drilling trajectory to guide the bit lateral drilling in oil reservoir. Logs simulated by the geosteering model for the current well are interpolated directly from logs of the adjacent well. These simulated logs cannot show layer heterogeneity, therefore it cannot ensure the horizon well drilling trajectory in a good reservoir. For this reason, the article inducts a log-constraint seismic impedance inversion method to modify geosteering model and predict target heterogeneity, so that it can control the drilling trajectory in the good physical property place of reservoir. The geosteering results of real horizon well drilling indicate that geosteering model modified by log-constraint seismic impedance inversion can well guide horizon well drilling trajectory, reduce risks, and increase the reservoir drilling rate.
