MOBIL <MOB> ADDS NATURAL GAS RESERVES IN 1986 Mobil Corp increased net proven reserves of natural gas liquids in 1986 from the previous year according to data in its 1986 annual report. The report states that total net proved reserves at year's end stood at 2.5 billion barrels, an increase of 94 mln barrels or four pct above the previous year and detailed data show that the gains resulted from an increase in net proved reserves of natural gas liquids. Mobil said gains were in Indonesia where a sixth production facility began operation in October with a capacity to manufacture 1.7 mln tonnes of liquified natural gas. The company also said that new capacity brought onstream last year replaced 120 pct of Mobil's production, which declined by about four pct in 1986 from the previous year. Detailed data on reserves shows that U.S. net proved reserves of crude oil fell to 837 mln barrels from 853 mln barrels in 1985, natural gas liquid reserves were also lower in 1986 from the previous year. Net proved crude oil reserves also fell in Canada to 224 mln barrels and in Europe to 403 mln barrels from the previous year's level of 231 mln barrels and 439 mln barrels, respectively.