Migration of deep-earth gas could be the reason of formation of funnels in Yamal
11:03 11 декабря 2014
Scientists continue discussing reasons of appearing of the unique funnel found in Yamal.
Thus, in the opinion of the director of the Sub-Arctic Scientific Research Center Anna Kurchatova, migration of deep-earth gas could become the reason of its formation, as the agency of oil and gas information «Samotlor-express» informs.
Fractures in sedimentary cover and an icy lid (massive ground ices) prevent from free migration of gas and create temporary traps on the border, as she explains. Strength of the lid changes at change of temperature: some rocks become yielding, some stay frozen. Everything that can flow – flows; that cannot flow – breaks. Large emission can happen in the result, as it happened in Yamal.
According to the words of Anna Kurchatova, emissions of gas happened earlier, but such scale is for the first time. The government of Yamal actively participates in study of the funnel in the region. The Russian center for the Arctic was created. As the scientist is sure, in the future a mechanism for prevention from such emissions will be created. If scientists widely use detailed micro-seismic methods, they will be able to find signs of formation of such traps. Drilling with detailed core sampling and studying is necessary for that. Now the scientists have three samples of core, they will start study them in January. She hopes that they will receive new data after researches.
The mysterious funnel in Yamal with the diameter 40-60 meters was found by oil workers this July. By the results of the latest researches, when the scientists descended to the crater, the experts denied the version of appearing of the funnel in the result of falling of a meteorite on the Earth. They consider that emission of gas hydrates happened in the district of Bovanenkovo. It could be caused with heating of ground surface and geological peculiarities of this area.