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Influence of Reservoir Processes on Gas in Cerro Prieto Steam

机译：储层工艺对塞罗普罗佐蒸汽气体的影响

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Changes in CO_(2) content and N_(2)/Ar in steam produced by wells from the eastern parts of the Cerro Prieto, Mexico, geothermal field were studied to determine the influence of various reservoir processes on the steam gases. Geothermal brines in the upthrown reservoir block to the NE of the trace of the major normal Fault H underwent intensive boiling when the installed generating capacity in the field was increased from 180 to 620 MW. In these areas of boiling, production enthalpy increased greatly and CO_(2) content in steam increased two to three times. N_(2)/Ar ratios remained near that of air-saturated surface waters but were lower in areas where boiling decreased and where production was from gas-depleted brines residual to boiling. Newly drilled deeper wells also produced steam low in gas and in N_(2)/Ar ratios, suggesting that these zones were also affected by boiling and gas loss. Injection of highly evaporated, air-equilibrated brine in the SW of the field seemed to have little effect on the gases in the steam. There is evidence of a 1990 short-term high N_(2)/Ar anomaly in the eastern part of the field possibly from injection of air with the residual brine, and evidence that in 1995 and 1996 the NE of the field produced steam with much higher N_(2)/Ar, perhaps reflecting a bubble of altered magmatic gas that entered the system at depth.
机译：研究了来自墨西哥东部地区的井中的井中的CO_（2）含量和N_（2）/ AR的变化，研究了地热场，以确定各种储层过程对蒸汽气体的影响。促使储层块的地热盐水到NE的主要正常故障H的痕迹H型密集沸腾时，该领域的安装能力从180增加到620 MW。在这些沸腾的区域中，生产焓大大增加，蒸汽中的含量增加两到三次。 N_（2）/ AR比率靠近空气饱和的表面水域，但在沸腾下降的区域和生产来自燃气耗尽的盐水残留的区域较低。新钻井井也产生蒸汽低气体和N_（2）/ AR比率，表明这些区域也受到沸腾和气体损失的影响。在该领域的SW中注入高度蒸发的空气平衡的盐水似乎对蒸汽中的气体影响不大。有证据表明，有一个1990年的短期高N_（2）/ AR异常在领域的东部，可能是通过用残余盐水注入空气，以及1995年和1996年的证据，该领域的NE与蒸汽产生多样化更高的N_（2）/ AR，也许反映了在深度进入系统的改变的岩浆气体的气泡。

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