Tai buvo lengva suprasti. O dabar bus sunkiau. Pasirodė nauji tyrimų rezultatai. Jie yra blogesni, negu aš tikėjausi. Girdėjote, kaip truputį atsukus vandenį, iš čiaupo netoli skalūnų skaldymo vietos išeina degios dujos? Pasirodo, tai yra neretas atvejis (keturi iš penkių vandens šulinių). Ir tų dujų būna daugiau, negu šiuolaikinės JAV normos leidžia [1]. Teršalų šuliniuose sudėtis taip pat rodo, kad jie pateko į šulinius iš kilometro ar daugiau nuotolyje esančių uolienų skaldymo gręžinių [2]. Išvada, kad amerikiečiai dar nemoka padaryti sandarius gręžinius.
Va kaip atrodo žmogus, hidrauliniu būdų skaldantis skalūnus [1]:
1. "New research just published in the Proceedings of the National Academy of Sciences by Robert Jackson, from Duke University, and his colleagues will add fuel to the controversy. Dr Jackson studied water samples from 141 private drinking-water wells in an area home to 5,000 or so drilling sites sitting atop the Marcellus shale, a gas-rich geological formation stretching from northeastern Pennsylvania to southeastern New York. He found that four out of five wells contained methane, the chemical signature of which suggested that it originated from the Marcellus, rather than being the product of biological processes closer to the surface.
Concentrations of the gas were six times higher for homes located less than 1km (0.6 miles) from the nearest drilling site than for those farther away. Levels of ethane and propane, other ingredients of natural gas, were higher, too. All were well above the levels the Department of Interior considers safe. The relationship cannot be put down to gasmen's penchant for plonking their drills in spots where natural gas is most abundant in the first place. In the absence of drilling the gas, being trapped in the shale beds 1,500-2,500 metres beneath the countryside, would stay put; concentrations nearer to the surface would remain unaffected." (Fracking: Fire water)
2. Gas drilling taints groundwater
2. Gas drilling taints groundwater
