Table 10: Optimal combinations and optimization validation.

PorosityPermeability (md)Fracture half-length (ft)Fracture conductivity (md-ft)Fracture spacing (ft)Well distance (ft)Gas price ($/MSCF)Optimal NPV ($MM)Validated NPV ($MM)Relative error

0.060.00014002680100038.707.910.091
0.060.000140026701000412.4011.810.047
0.060.000140026601000516.3415.750.036