**10. Conclusions**

The use of surface drilling data provides a reasonable engineering solution to the lack of well data in unconventional reservoirs. The correction of the MSE by removing friction losses turns surface drilling data into a major source of information for unconventional well planning. This information includes an estimation of geomechanical logs, pore pressure, stresses, porosity and natural fracture. These rock properties could be used as a first approximation in a well-centric approach to geoengineer completions. Moreover, combining these various logs from different wells into 3D reservoir models provides even more opportunities including using them in reservoir geomechanics, 3D planar hydraulic fracture design and reservoir simulation. The use of MPM modeling tools with the 2D horizontal plane strain framework allows the characterization of the lateral stress gradients, differential stress and the orientation of the maximum stress, all of which are key inputs needed to plan the optimal position and orientation of unconventional wellbores. Using geomechanical logs derived from surface drilling data to identify the geologic interfaces and deploying MPM tools in vertical 2D sections of the reservoirs, allows for capturing the effects of laminations and the loss of hydraulic fracturing energy

 in weak interfaces. These 2D decoupled approaches provide useful information to constrain a 3D grid based planar hydraulic fracturing approach. These geomechanical constraints define both the lateral and vertical directions which enable the estimation of distribution of proppants with a higher degree of certainty. The resulting realistic fracture geometry and its conductivity can be used in a commercial finite difference reservoir simulator or alternatively in a simplified fast marching method simulator providing similar information as the one given by the finite difference reservoir simulator, but in a fraction of the time. When using all these 3D models and their results in a fast marching method simulator the impact of the interference between wells and other optimization challenges can be estimated quickly while providing similar results as those derived with a finite difference reservoir simulator. By integrating the surface drilling data with 3D reservoir models, hydraulic fracturing design and reservoir simulation into a single software platform, this fast and constrained approach allows for a better management of unconventional wells within a competitive calculation time.
