Siddharth Misra is currently associate professor at the Harold Vance Department of Petroleum Engineering, Texas A&M University, College Station, Texas. His research work is in the area of data-driven predictive models, machine learning, geosensors, and subsurface characterization. He earned a PhD in petroleum engineering from the University of Texas and a bachelor of technology in electrical engineering from the Indian Institute of Technology in Bombay. He received the Department of Energy Early Career Award in 2018 to promote geoscience research.Hao Li is a PhD-degree candidate in the Mewbourne College of Earth and Energy (MCEE) at the University of Oklahoma in Norman. He interned with Facebook on improving ranking models using machine learning. His research interests include machine learning, petrophysics, and data analytics. He holds an MS degree in petroleum engineering from China University of Petroleum in Beijing.Jiabo He is currently a doctoral candidate in computer science at the University of Melbourne, Australia. Jiabo's research area includes deep learning, reinforcement learning, and imitation learning. He earned an MS in petroleum engineering from the University of Oklahoma and a BS in petroleum engineering from the China University of Petroleum in Beijing.

1. Unsupervised outlier detection techniques for well logs and geophysical data2. Unsupervised clustering methods for noninvasive characterization of fracture-induced geomechanical alterations3. Shallow neural networks and classification methods for approximating the subsurface in situ fluid-filled pore size distribution4. Stacked neural network architecture to model themultifrequency conductivity/permittivity responses of subsurface shale formations5. Robust geomechanical characterization by analyzing the performance of shallow-learning regression methods using unsupervised clustering methods6. Index construction, dimensionality reduction, and clustering techniques for the identification of flow units in shale formations suitable for enhanced oil recovery using light-hydrocarbon injection7. Deep neural network architectures to approximate the fluid-filled pore size distributions of subsurface geological formations8. Comparative study of shallow and deep machine learning models for synthesizing in situ NMR T2 distributions9. Noninvasive fracture characterization based on the classification of sonic wave travel times10. Machine learning assisted segmentation of scanning electron microscopy images of organic-rich shales with feature extraction and feature ranking11. Generalization of machine learning assisted segmentation of scanning electron microscopy images of organic-rich shales12. Characterization of subsurface hydrocarbon/water saturation by processing subsurface electromagnetic logs using a modified Levenberg-Marquardt algorithm13. Characterization of subsurface hydrocarbon/water saturation using Markov-chain Monte Carlo stochastic inversion of broadband electromagnetic logs

Machine Learning for Subsurface Characterization develops and applies neural networks, random forests, deep learning, unsupervised learning, Bayesian frameworks, and clustering methods for subsurface characterization. Machine learning (ML) focusses on developing computational methods/algorithms that learn to recognize patterns and quantify functional relationships by processing large data sets, also referred to as the "big data." Deep learning (DL) is a subset of machine learning that processes "big data" to construct numerous layers of abstraction to accomplish the learning task. DL methods do not require the manual step of extracting/engineering features; however, it requires us to provide large amounts of data along with high-performance computing to obtain reliable results in a timely manner. This reference helps the engineers, geophysicists, and geoscientists get familiar with data science and analytics terminology relevant to subsurface characterization and demonstrates the use of data-driven methods for outlier detection, geomechanical/electromagnetic characterization, image analysis, fluid saturation estimation, and pore-scale characterization in the subsurface.