基于深度残差网络的随钻方位电磁波电阻率测井反演方法

Inversion of Azimuthal Electromagnetic Wave Resistivity LWDBased on Deep Residual Network

  • 摘要: 随钻方位电磁波电阻率测井可以提供丰富的地下信息,帮助完成储层位置确定和边界探测等任务,但常用的基于物理方程的迭代反演方法计算效率较低,在实时地质导向中受到诸多限制。为此,提出了一种基于深度残差网络的随钻方位电磁波电阻率测井资料智能反演方法。该方法将残差块中的卷积层和池化层替换为全连接层,并使用多头注意力机制来理解输入数据的关联性,以解决非线性回归问题;通过评估模型深度和宽度,并使用贝叶斯超参数调优算法找到随钻电磁波电阻率反演方法中最优的超参数,以提高反演模型的性能。该方法在模型试验中的平均准确率达到98.5%;在实际测井资料的平均准确率达到97.2%,单点反演时间约为0.01 s。研究表明,随钻方位电磁波电阻率测井反演方法能够快速准确地反演测井资料。

     

    Abstract: Azimuthal electromagnetic wave resistivity logging while drilling(LWD) can provide abundant subsurface information and help to determine reservoir location and complete boundary detection. However, the common iterative inversion method based on physical equations has low computational efficiency and is limited in real-time geosteering. Therefore, an intelligent inversion method of azimuthal electromagnetic wave resistivity logging data based on a deep residual network (ResNet) was proposed. The method replaced the convolution and pooling layers in the residual block with fully connected layers and used a multi-head attention mechanism to understand the relevance of the input data, so as to solve the nonlinear regression problem. By evaluating the depth and width of the model and using a Bayesian optimization tuning algorithm to find the optimal hyperparameters of the electromagnetic wave resistivity inversion method, the performance of the inversion model was improved. The method showed good accuracy in model experiments, with an average accuracy of 98.5%. In the actual logging data, the average accuracy rate was 97.2%, and the single point inversion time was about 0.01 s. Intelligent inversion method of azimuthal electromagnetic wave resistivity logging data could quickly and accurately invert the azimuthal electromagnetic wave resistivity logging data.

     

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