Unconventional reservoirs are usually complex and highly heterogeneous, such as shale, coal, and tight sandstone reservoirs. The strong physical and chemical interactions between fluids and pore surfaces lead to the inapplicability of conventional approaches for characterizing fluid flow in these low-porosity and ultralow-permeability reservoir systems. Therefore, new theories and techniques are urgently needed to characterize petrophysical properties, fluid transport, and their relationships at multiple scales for improving production efficiency from unconventional reservoirs. This book presents fundamental innovations gathered from 21 recent works on novel applications of new techniques and theories in unconventional reservoirs, covering the fields of petrophysical characterization, hydraulic fracturing, fluid transport physics, enhanced oil recovery, and geothermal energy. Clearly, the research covered in this book is helpful to understand and master the latest techniques and theories for unconventional reservoirs, which have important practical significance for the economic and effective development of unconventional oil and gas resources.
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shale gas permeability prediction by NMR logs matrix–fracture interaction faults remaining oil distributions unconventional reservoirs coal deformation reservoir depletion carbonate reservoir nanopore fracturing fluid pseudo-potential model shale reservoirs matrix-fracture interactions multi-scale fracture succession pseudo-steady state (SPSS) method fluid transport physics integrated methods chelating agent dissolved gas non-equilibrium permeability effective stress fractal fracture network spontaneous imbibition tight oil porous media 0-1 programming the average flow velocity geothermal water micro-fracture pore types pore network model petrophysical characterization nitrogen adsorption analysis of influencing factors mudstone rheology velocity profile shale permeability flow resistance global effect tight sandstones fractal dimension contact angle temperature-resistance fractured well transient productivity reservoir classifications deep circulation groundwater viscosity NMR fractional diffusion lattice Boltzmann method multiporosity and multiscale fractal geometry imbibition front productivity contribution degree of multimedium wetting angle pH of formation water enhanced oil recovery isotopes tight sandstone fracture diversion shale SRV-fractured horizontal well low-salinity water flooding shale gas reservoir tight reservoirs fracture continuum method tight oil reservoir Lucaogou Formation hydraulic fracturing clean fracturing fluid recovery factor flow regimes local effect complex fracture network pore structure gas adsorption capacity polymer non-linear flow conformable derivative production simulation analytical model enhanced geothermal system multi-scale flow experimental evaluation extended finite element method fluid-solid interaction groundwater flow well-placement optimization thickener imbibition recovery equilibrium permeability slip length large density ratio clay mineral composition finite volume method volume fracturing influential factors sulfonate gemini surfactant