随钻方位电磁波电阻率测井数据精度分析及实时反演成像

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

随钻方位电磁波电阻率测井数据包含地层电阻率、地层边界方位及距离等信息,其中地层边界的方位和距离作为大斜度井/水平井开发过程中的重要参数,是地质导向正确决策的关键.通过反演和成像技术能够将随钻方位电磁波电阻率测井数据转换为可视化的地层参数信息.由于测井过程中上传数据有限,本文分析了不同数据的测量精度,为上传数据选取提供参考.基于传播矩阵算法和Levenberg-Marquardt算法开展了一维快速反演研究.通过实时监测模型参数质量,避免反演陷入局部极小值,保证模型参数的全局收敛性.最后,通过实测数据处理,验证了反演算法的可靠性.

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.