论文标题
使用深度学习从钻探数据中的实时井日志预测
Real-Time Well Log Prediction From Drilling Data Using Deep Learning
论文作者
论文摘要
目的是研究从实时钻探数据中预测井中地下岩石性能的可行性。地球物理日志,即密度,孔隙率和声音日志对于地下资源估计和开发至关重要。这些有线石油物理测量值选择性地部署,因为它们是昂贵的;同时,在每个钻孔良好的情况下都记录了钻井信息。因此,通过钻井数据进行有线记录预测的预测工具可以帮助管理做出有关数据获取的决策,尤其是对于描述和生产井。这个问题是非线性的,在钻井参数之间具有强大的内在性。因此,探索了深入学习解决此问题的潜力。我们提出了使用基于距离的全局灵敏度分析的数据增强和功能工程的工作流程。我们提出了一个基于立体的卷积神经网络,将时间卷积网络与深度学习模型相结合。该模型旨在学习数据的低频和高频含量。来自北海伏拉场的Equinor数据集的12井用于学习。模型预测不仅捕获趋势,而且在密度,孔隙率和声音原木之间的物理上也是一致的。在测试数据上,均方根误差达到0.04的低值,但相关系数在0.6左右。但是,该模型能够区分不同类型的岩石,例如胶结砂岩,未固结的砂和页岩。
The objective is to study the feasibility of predicting subsurface rock properties in wells from real-time drilling data. Geophysical logs, namely, density, porosity and sonic logs are of paramount importance for subsurface resource estimation and exploitation. These wireline petro-physical measurements are selectively deployed as they are expensive to acquire; meanwhile, drilling information is recorded in every drilled well. Hence a predictive tool for wireline log prediction from drilling data can help management make decisions about data acquisition, especially for delineation and production wells. This problem is non-linear with strong ineractions between drilling parameters; hence the potential for deep learning to address this problem is explored. We present a workflow for data augmentation and feature engineering using Distance-based Global Sensitivity Analysis. We propose an Inception-based Convolutional Neural Network combined with a Temporal Convolutional Network as the deep learning model. The model is designed to learn both low and high frequency content of the data. 12 wells from the Equinor dataset for the Volve field in the North Sea are used for learning. The model predictions not only capture trends but are also physically consistent across density, porosity, and sonic logs. On the test data, the mean square error reaches a low value of 0.04 but the correlation coefficient plateaus around 0.6. The model is able however to differentiate between different types of rocks such as cemented sandstone, unconsolidated sands, and shale.