Accuracy analysis and real-time inversion and imaging logging while drilling azimuth electromagnetic wave resistivity measurements

The azimuthal electromagnetic wave resistivity logging data while drilling includes information such as formation resistivity, formation boundary orientation, and distance. The orientation and distance of the formation boundary, as important parameters in the highly deviated/horizontal wells development, are the key to make correct geological guidance decisions. Through inversion and imaging techniques, azimuth electromagnetic wave resistivity logging data while drilling can be transformed into visualized formation parameter information. During the logging process, uploading data is limited, this article analyzes the measurement accuracy of different data, providing reference for the selection of upload data. Research for one-dimensional fast inversion was conducted based on the propagation matrix algorithm and the Levenberg-Marquardt algorithm. By monitoring the quality of model parameters in real-time, it avoids inversion falling into local minima and ensures the global convergence of model parameters. Finally, the reliability of the inversion algorithm was verified through actual data processing.