Mofete field, located near Naples, in southern Italy, lies within the large Campi Flegrei caldera. Drilling for geothermal fluids was carried out unsuccessfully in 1939-1954. AGIP, in joint venture with the national utility ENEL, after intensive exploration efforts, resumed drilling at the end of 1978; several new deep wells indicate the presence of a water dominated field in Mofete with three reservoirs (only the shallowest of which was reached by previous wells). The deepest aquifer, tapped by well Mofete 5 at the depth of about 2700 m, contains hypersaline fluids (about 516 000 ppm TDS at atmospheric conditions corresponding to about 150 000 ppm in the reservoir) with a bottom hole temperature of about 360OC. The intermediate level, reached by well Mofete 2 at 1900 m depth. is characterized by low salinity fluids (about 38 000 ppm TDS at the surface corresponding to 18 000 ppm calculated in the reservoir) with a reservoir temperature of 34OoC. The uppermost reservoir, tapped by wells Mofete 1, 3D. 7D, 8D and 9D ranges between 550 and 1500 m depth and has water with salinity ranging from 40030 to 76 000 ppm TDS at the surface corresponding to 28 000 to 52 000 ppm in the reservoir with a bottom temperature of 230-308OC. The uppermost aquifer is in fractured volcanic rocks while the other two are in a metamorphosed volcano- sedimentary complex. Long term production and injection tests will be carried out shortly to ascertain the main characteristics of the field.

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