Non-Directional Resistivity Logging in High-Angle Wells

The patent introduces a new dimension of analysis by utilizing the spatial relationship between the well trajectory and bed boundaries. Instead of relying solely on directional antenna measurements, the method uses the geometric configuration of the well path crossing formation layers to create additional independent equations. This dimensional approach allows decoupling of Rv and dip parameters through mathematical inversion, resolving the measurement ambiguity without requiring complex directional hardware modifications.

The patent creates a virtual directional measurement system by using non-directional antennas combined with computational modeling. Instead of physically tilting or transposing antennas, the method copies the effect of directional measurements through mathematical inversion techniques that process data from axial antennas. This computational approach replicates the functionality of directional tools while maintaining the simplicity of non-directional hardware, effectively decoupling measurement capability from hardware complexity.

The patent introduces bed boundary detection as an intermediary element that mediates between the simple non-directional measurements and the complex formation parameters. By first identifying bed boundaries through the well trajectory geometry, the method creates intermediate constraints that break the coupling between Rv and dip. This intermediary approach allows conventional tools to indirectly determine formation parameters that would otherwise require complex directional measurements, effectively using the well path geometry as a mediator to resolve parameter ambiguity.