融合图像外特征的岩屑岩性深度学习识别方法

岩屑的岩性识别是地质工作中的一项重要内容。为解决传统人工鉴别岩性的低效问题和传统机器识别的低可靠性问题，提出一种融合图像特征与图像外特征的岩性识别方法。首先采集岩屑的高分辨率图像，使用Xception特征提取器对图像特征进行提取并降维为一维向量，提高模型抽象特征敏感性并防止网络退化问题。同时量化岩屑的物理化学特征如：与盐酸反应程度、含矿物纯度、元素分析结果、硬度等，构建图像外特征向量。融合图像特征向量与图像外特征向量为总特征向量，构建神经网络与分类器进行训练，产生岩性识别模型。该模型相较于仅图像训练模型，在高质量岩屑图像数据集上提高3.45个百分点，在低质量岩屑图像数据集上提高20.92个百分点。该模型结合了传统录井与机器学习的优势，为建立可靠岩性剖面与实现数字化岩屑录井提供了更为高效的方法。

Deep learning method for rock debris lithology recognition by fusing external features of image

The lithology identification of rock debris is an important part of geological work. In order to solve the low efficiency problem of traditional artificial lithology identification and the low reliability problem of traditional machine recognition, a lithology identification method based on fusion of image features and external features was proposed. Firstly, the high-resolution images of rock debris were collected, and the Xception feature extractor was used to extract the image features and reduce the dimension to one-dimensional vector, so as to improve the sensitivity of model abstract features and prevent network degradation. At the same time, the physical and chemical characteristics of rock debris, such as reaction degree with hydrochloric acid, mineral purity, element analysis results, hardness and so on, were quantified to construct the external feature vector of the image. Combining the image feature vector and the image feature vector as the total feature vector, the neural network and classifier were constructed to train and generate the lithology recognition model. Compared with the only image training model, this model increases by 3.45 percentage points on the high-quality lithic image dataset and 20.92 percentage points on the low-quality lithic image dataset. This model combines the advantages of traditional logging and machine learning, and provides a more efficient method for establishing reliable lithology profile and realizing digital rock debris logging.