**9. Estimating well performances using reservoir simulation**

For unconventional reservoirs undergoing hydraulic fracturing the long-term performance of a well could be represented by its Estimated Ultimate Recovery (EUR) which will also affect the extent of the depleted zone. The EUR and the size of the depleted zone will be major inputs needed for planning the development of an unconventional reservoir. This critical information requires the use of dynamic fluid flow reservoir simulation. In unconventional reservoir simulation, in addition to all the usual matrix properties required as input, the properties of the stimulated zone around the wellbore are necessary to capture the effects of the hydraulic fracturing and the development of the SRV. Multiple software tools and ways to provide the necessary input have been used. Despite major progress made recently in reservoir simulation, it remains a time-consuming task which prompted the need to develop a faster approach using the fast marching method (FMM). Both approaches are illustrated and compared with a field example.

*Surface Drilling Data for Constrained Hydraulic Fracturing and Fast Reservoir Simulation… DOI: http://dx.doi.org/10.5772/intechopen.84759* 
