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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The sealing capacity of the cap rock above the Torre Alfina geothermal reservoir (Central Italy) revealed by soil CO_2 flux investigations
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The sealing capacity of the cap rock above the Torre Alfina geothermal reservoir (Central Italy) revealed by soil CO_2 flux investigations

机译：土壤CO_2通量研究揭示了Torre Alfina地热储层（意大利中部）上方盖层的封闭能力

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摘要

Torre Alfina is a medium enthalpy (T = 140 ℃) geothermal field in Central Italy, hosted in buried fractured Mesozoic limestones, extensively explored in the 1970s and 1980s, but which so far has not been exploited. A detailed diffuse soil CO_2 flux investigation (1336 measurements over a surface of 12.6 km~2) and the periodic monitoring of soil CO_2 flux from target areas indicate that in most of the area, even above a pressurized gas cap existing at the reservoir top, the soil CO_2 flux is low and mostly within the background threshold (48 g m~(-2) day~(-1)) and is likely generated by biological soil respiration. Anomalous values (up to 30.250 g m~(-2) day~(-1)) are found only in the proximity of a small zone with gas vents whose composition is identical to that of the gas produced by the geothermal wells tapping the reservoir. This is the only zone where a fault connecting the deep geothermal reservoir with the surface does exist. These data are compared with those of the near Latera high enthalpy geothermal field (T = 210 ℃), where anomalous soil CO_2 flux is recorded above the productive reservoir. The difference of soil CO_2 release in the two fields is attributed to the differences in the impervious cover (allochthonous flysch deposits) above the carbonate reservoir, which is thin and locally lacking at Latera, and continuous and thick (＞400 m) at Torre Alfina. Results demonstrate that soil CO_2 flux investigations are useful in geothermal exploration, but only high flux values likely indicate the presence of a geothermal reservoir at depth, whereas low flux values can indicate either the lack of an active geothermal reservoir at depth or the presence of a very effective impervious cover above the reservoir.
机译：Torre Alfina是意大利中部的一个中等焓（T = 140℃）地热田，以埋藏的裂隙中生代石灰岩为主体，在1970年代和1980年代进行了广泛的勘探，但至今尚未得到开发。详细的扩散土壤CO_2通量调查（在12.6 km〜2的表面上进行了1336次测量）和对目标区域土壤CO_2通量的定期监测表明，在大多数区域，甚至在储层顶部存在的加压气顶上方，土壤CO_2通量较低，且大多在背景阈值（48 gm〜（-2）day〜（-1））以内，很可能是由于生物土壤呼吸而产生的。异常值（高达30.250 g m〜（-2）天〜（-1））仅在具有排气孔的小区域附近被发现，排气孔的成分与地热井注入储层的气体的成分相同。这是唯一存在深层地热储层与地表之间断层的区域。将这些数据与附近的拉塔拉高焓地热场（T = 210℃）的数据进行了比较，后者在生产储层上方记录了异常的土壤CO_2通量。这两个田间土壤CO_2释放的差异归因于碳酸盐岩储集层上方的不透水覆盖层（不连续的飞石沉积物）的差异，该层在Latera薄而局部缺乏，在Torre Alfina处连续且厚（＞ 400 m） 。结果表明，土壤CO_2通量研究可用于地热勘探，但只有高通量值才可能表明在深处存在地热储层，而低通量值则可能表明在深处没有活动的地热储层或存在地热储层。储层上方非常有效的防渗层。

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