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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Gas blowout from shallow boreholes at Fiumicino (Rome): Induced hazard and evidence of deep CO_2 degassing on the Tyrrhenian margin of Central Italy
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Gas blowout from shallow boreholes at Fiumicino (Rome): Induced hazard and evidence of deep CO_2 degassing on the Tyrrhenian margin of Central Italy

机译：菲乌米奇诺（罗马）浅井眼的瓦斯涌出：诱发的危险和意大利中部第勒尼安边缘深层CO_2脱气的证据

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A borehole drilled at Fiumicino (Rome) down to only 27 m depth in a zone where no gas emission at the surface was known, caused a gas blowout from a pressurized gas pocket confined beneath a clay cover. Gas slowly diffused from the borehole within superficial permeable sand. Seven persons living in three ground floor flats of a near building had to be hospitalized due to CO_2 exposure. All the houses in the proximity were evacuated. At the request of the Fire Brigade two additional boreholes were drilled nearby, hoping that this could rapidly exhaust the gas stored underground. To the contrary the soil gas flux near houses increased and indoor CO_2 air concentration rapidly rose to lethal values (15 to 30 vol.%). As a remediation we suggested to restore the continuity of the impervious gas cover by squeezing quick-setting cement into the formation through new boreholes to be drilled near the existing ones. Although the first cement squeeze reduced drastically the CO_2 soil flux and indoor concentration, six additional squeezes had to be carried out in order to lower the gas emission below the gas hazard threshold. The gas was mostly made of CO_2 (98 vol.%) with minor N_2 and CH_4. Its chemical and isotopic composition (δ~(13)C_(CO2)=- 1.55; ~3He/~4He=0.314 Ra) is similar to that of the gas manifestations of Mts. Sabatini and Alban Hills volcanic areas. Though being somewhat contaminated by crustal and shallow organic volatiles, these gases likely have a component originated in the mantle, that beneath the volcanic Roman Comagmatic Province is probably deeply contaminated with crustal material. The Fiumicino gas blowout indicates that the area of Central Italy characterized by strong CO_2 degassing extends westerly to include the Tyrrhenian coast.
机译：在菲乌米奇诺（罗马）钻探的一个钻孔中，在一个已知地表无气体排放的区域中，钻探深度仅为27 m，这导致了一个气体从限定在粘土覆盖层下的加压气藏中喷出。气体在浅层可渗透砂土中从井孔缓慢扩散。由于接触CO_2，居住在附近建筑物三个底层公寓中的7人必须住院。附近的所有房屋都被疏散了。应消防队的要求，在附近又钻了两个井眼，希望能迅速用完地下的天然气。相反，房屋附近的土壤气体通量增加，室内CO_2空气浓度迅速上升至致死值（15至30％（体积））。作为补救措施，我们建议通过将速凝水泥通过新钻孔在现有钻孔附近挤入地层中来恢复不透气气层的连续性。尽管第一次水泥挤压大大降低了CO_2的土壤通量和室内浓度，但必须进行六次额外的挤压才能将气体排放降低到低于气体危害阈值。气体主要由CO_2（98％（体积））和少量N_2和CH_4组成。其化学和同位素组成（δ〜（13）C_（CO2）=-1.55;〜3He /〜4He = 0.314 Ra）与Mts的气体表现相似。萨巴蒂尼（Sabatini）和奥尔本山（Alban Hills）火山区。尽管这些气体被地壳和浅层有机挥发物污染了，但这些气体可能具有源自地幔的成分，即在罗马罗马岩浆省以下的火山岩可能被地壳物质严重污染了。 Fiumicino天然气井喷表明，意大利中部特征在于强烈的CO_2脱气，其西风向西延伸至第勒尼安海岸。

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