188 Reservoir Engineering 20 18 ............. 16 ............ I 14 ............ ............. 12 v) a c3 IO w 8 6 4 2 C CH, C.U. - 0 0 2 4 6 8 10 12 14 Flgure 5-112. Chart for converting Zgas to Zmethane [217].