Accelerating the exploitation of deep oil and gas resources (for example, shale oil and gas, tight sandstone gas, coalbed methane, and so on) can help to alleviate the gaps between energy supply and demand. However, the deep reservoirs are characterized by complex geological environments such as high temperatures, high pressure, complicated in-situ stress fields and developed multiscale natural fractures, which can create many problems for the exploitation of deep oil and gas resources compared with conventional resources.

In recent years, typical engineering problems for deep oil and gas resource exploitation involve wellbore instability for long horizontal wells, hydraulic fracturing induced earthquake disasters, frac hits between multiple wells, casing deformation, and more. Geomechanical research on deep reservoirs to provide a theoretical basis and technical support for improving the efficient exploitation of oil and gas resources should be carried out urgently.

The aim of this Special Issue is to collect original research or review articles on the latest theories and techniques related to deep unconventional oil and gas exploitation. All theoretical, numerical, experimental, and field studies are welcome.

Potential topics include but are not limited to the following:

• Multiscale natural fractures/faults characterization
• Rock deformation characteristics under high temperature and high pressure (HTHP)3D/4D in-situ stress prediction
• Three-dimensional pore pressure prediction method
• Pressure conduction within complex fractures
• Methodology of multiple physical field coupling
• Mechanism of hydraulic fracture initiation and propagation
• Optimization of hydraulic fracturing and proppant transport
• Advances of waterless fracturing, Infill fracturing and refracturing
• Fault reactivation related to unconventional oil/gas exploitation
• Frac hits in stacked and staggered horizontal wells
• Seepage and fluid flow in multiscale fractures
• Geology-engineering integration technology