Through building 3D geological models in different drilling time according to the logging while drilling (LWD) data and by updating the previous geological models, the dynamic updating of geological model could enable the acquisition of the spatial distribution of reservoir effectively and find the structural and occurrence changes instantly, so as to modify the former designed borehole track and adjust the drilling track by geosteering, and drill the oil layers in the best way. It can improve the effectiveness of horizontal interval and the drilling benefit. Combined with well logging, geological data and seismic data as well as the LWD data, this method was applied to the drilling of the Guanjiapu Oilfield, and the geological conditions were constrained by the multistage modeling method, to update and improve the Gamma Ray (GR), porosity and permeability models and the accuracy of reservoir random models, especially the sandstone distribution model to ensure the accuracy and reliability of the model. The drilling of Well Zh8-H has shown that the geosteering drilling capability was obviously improved in light of providing accurate geological model timely.
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