Processes of flow and displacement of multiphase fluids though porous media occur in many subsurface systems and have found wide applications in many scientific, technical, and engineering field. This book focuses on the fundamental theory of fluid flow in porous media, covering fluid flow theory in classical and complex porous media, such as fractured porous media and physicochemical fluid flow theory. Key concepts are introduced concisely and derivations of equations are presented logically. Solutions of some practical problems are given so that the reader can understand how to apply these abstract equations to real world situations. The content has been extended to cover fluid flow in unconventional reservoirs. This book is suitable for senior undergraduate and graduate students as a textbook in petroleum engineering, hydrogeology, groundwater hydrology, soil sciences, and other related engineering fields. Key Features: ○ Key concepts in each chapter are introduced as a separate section so that readers can easily find and understand them ○ Derivations of key equations are presented in detail so that readers can understand them step by step ○ Connections between this book’s content and other core contents in petroleum engineering are presented so that the readers can better understand the key role of this textbook and how it can be used in other courses

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