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The need for energy is increasing and but the production from conventional reservoirs is declining quickly. This requires an economically and technically feasible source of energy for the coming years. Among some alternative future energy solutions, the most reasonable source is from unconventional reservoirs. As the name “unconventional” implies, different and challenging approaches are required to characterize and develop these resources. This Special Issue covers some of the technical challenges for developing unconventional energy sources from shale gas/oil, tight gas sand, and coalbed methane.

horizontal well --- shale gas --- shock loads --- pseudo-steady-state non-equilibrium sorption --- unsteady state non-equilibrium sorption --- porosity–permeability --- fractured-vuggy reservoirs --- flow channel --- pressure derivative --- total organic carbon (TOC) --- CO2 huff-n-puff --- flow behavior --- unconventional reservoirs --- semi-analytical model --- gravel pack --- optimization measures --- fractures --- lab tests under reservoir condition --- dual-porosity system --- unconventional --- gravity differentiation --- MICP --- perforation safety --- fracture penetration extent --- organic-rich shale --- stress-dependent permeability --- equilibrium sorption --- helium porosimetry --- numerical model --- original gas in-place --- shale alteration --- injection and production pattern --- adsorption and desorption isotherms --- low-pressure gas adsorption --- initial water saturation --- drilling fluid --- sorption hysteresis --- coalbed methane --- gas content --- capillary number --- reorientation fractures --- water flooding effect --- organic pores --- tight reservoir --- condensate recovery --- Langmuir pressure --- Klinkenberg slippage theory --- limestone and calcareous mudstone interbedding --- petrophysics --- tight gas sand --- numerical analysis --- northern Guizhou --- wettability --- peak pressure --- sand control --- water imbibition --- clay bound water --- carbon dioxide sequestration --- adsorption capacity --- gas compressibility factors --- convolutional neural network --- multi-stage fracturing horizontal wells --- fractured tight reservoir --- physical model --- tight gas reservoirs --- automatic classification --- NMR --- catalytic oxidation characteristics --- micro-CT image --- wellbore stability --- gas adsorption and desorption --- gas shale --- medium volatile bituminous coal --- hydraulic flow units --- GEM® --- petrophysical properties --- compositional 3D --- rock-water-CO2 interaction --- source-mixed gas --- residual gas distribution --- oxidation reaction pathway --- coal rank --- oil migration --- clay content --- perforated string --- TOC recovery --- Computer Modelling Group (CMG) --- capillary trapping --- pore size distribution --- adsorption --- tight reservoirs --- well interference --- gradation optimization --- shale gas condensate reservoir --- Niutitang formation --- pulse decay test --- well testing --- Langmuir model --- methane adsorption capacity --- pore structure --- and tight sand gas) --- ultra-deep well --- deepwater well --- orthogonal test --- high pressure and low flowrate --- theoretical model --- safety analysis --- transient pressure --- catalyst-activated low temperature oxidation --- reservoir simulation --- Langmuir volume --- air flooding --- petrography --- total organic carbon --- electrical resistivity --- diffusion coefficient --- equation of state --- porosity --- zeta potential --- gas permeability measurement --- co-exploitation --- nuclear magnetic resonance --- Changqing tight oil --- visual experiment --- tight oil reservoirs --- caprock integrity --- coal measure gases (coalbed gas --- NIST-Refprop