Effective resistivity models for geosteering decisions

A system comprising:

• one or more sensors configured to obtain measurement data while drilling a wellbore in a subsurface formation;
• a processor;
• and
• a computer-readable medium having instructions stored thereon that are executable by the processor to cause the processor to perform the following operations,
• obtain the measurement data of the subsurface formation while drilling the wellbore in the subsurface formation;
• generate a horizontal resistivity model of the subsurface formation at respective depths along the wellbore based on the measurement data;
• generate a vertical resistivity model of the subsurface formation at the respective depths along the wellbore based on the measurement data;
• generate an effective resistivity at the respective depths along the wellbore based on the horizontal resistivity model and the vertical resistivity model to indicate a formation resistivity in each direction of the wellbore;
• plot the effective resistivity at the respective depths to generate a visualization of the effective resistivity in a user interface on a display device;
• and
• perform a drilling operation with a drilling assembly based on the visualization of the effective resistivity.

A non-transitory, computer-readable medium having instructions stored thereon that are executable by a processor to perform operations comprising:

• obtaining, via one or more sensors on a drilling assembly, measurement data of a subsurface formation while drilling a wellbore in the subsurface formation;
• generating a horizontal resistivity model of the subsurface formation at respective depths along the wellbore based on the measurement data;
• generating a vertical resistivity model of the subsurface formation at the respective depths along the wellbore based on the measurement data;
• generating an effective resistivity at the respective depths along the wellbore based on the horizontal resistivity model and the vertical resistivity model to indicate a formation resistivity in each direction of the wellbore;
• plotting the effective resistivity at the respective depths to generate a visualization of the effective resistivity in a user interface on a display device;
• and
• performing a drilling operation with the drilling assembly based on the visualization of the effective resistivity.