Substantiate Vapliq Model of the Los Azufres Geothermal System

tem (natural state), and on its basis concluded that a substantial we revise and expand our previous vapvertical permeability contrast must liq model of the Los Azufres hydrotherexist between the vaporand the limal system. We present data that delinquid-dominated layer, the smaller pereate the vertical distributions of the meability corresponding to the later. formation's thermal conductivity and Assuming a homogeneous vertical disbulk density. Both distributions distribution of thermal conductivity we close a sharp change of formation propestimated permeability values and other erties at the boundary between the thermohydrological parameters of the liquid-dominated layer and the steam cap. This supports the inference of our previous work that a substantial perthis model was consistent with a meability contrast must exist between number of observations (downhole presthe liquidand vapor-dominated layers sures, stabilized temperatures, geotheof the system. we present the observed rmometrical estimates, hydrother-mal vertical distribution of liquid saturaalteration as deduced from drill cutttion in the system as inferred from the ings, and the ranges of permeabi-lity chemical composition of reservoir fluand thermal conductivity found in laboids and well logs; we use it, in addiratory measurements of drill cores), tion to the pressure profile, to calibthe reliability ef the estimates remairate the model's thermophysical paramened somewhat questionable because: (a ) ters. Calibration against both observed only the observed vertical pressure profiles greatly improves the reliabilprofile was fitted in detail, and it is , ity of the model. The new model prediknown that pressure fitting alone may cts vertical pe about 0.1~10 l8 m tem. In addition to the d vertical permeability, th des estimates of the fluxes and of the relativ functions of the system 1988a, 1988b) we otherma1 systems a gical conditions (The central, upfl systems is a sta liquid layer at dominated zone vapor-dominated cap). We also presented a vapliq model of the Los Azufres sysand Arellano 1988a, 1988b) we assume a step distribution of vertical pemeabi-