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Dangérosité des gaz de schistes : des avis divergents des deux cotés du "Channel" !

Article publié le 22 septembre 2011

Dangérosité des gaz de schistes : des avis divergents des deux cotés du "Channel" !

 Curieux tout de même ces divergences entre les avis des experts et des autorités suivant les pays dans lesquels on discutent de la recherche et de l'exploitaion des gaz de schistes.Pour les Etats Unis, vous avez vu au moins des extraits du film sur les débuts de l'exploration de ces gaz non conventionnels. Représentent ils la "vérité vrai" encore maintenant, ou bien un incident des débuts de l'exploitation des gaz de schistes ? Je ne sais mais je reste surpris que l'on puisse continuer d'exploiter ces gisements qui représentent désormais 15pct de la production américaine de gaz sans que les autorités en aient interrompus l'exploitation, surtout aprés la catastrophe du Golfe du Mexique alors qu'elle ne se sont pas montrées particulièrement brillantes à cette occasion.

Je faisais allusion plutôt aux positions rigoureusemnt opposées prises par les britanniques et les français sur ce sujet. La Commission Energie de la Chambre des Communes vient en effet de donner son feu vert à l'exploration des gaz de schistes,- et vraisembablement à leur exploitation future-, avec le commentaire suivant :
" Il apparait qu'il n'y a rien de dangereux dans le procédé de fracturation en lui même et, dès lors que l'intégrité d'un puits est assurée,l'extraction de gaz de schiste devrait être sure" !

Les députés français ont été moins technique et plus brutaux puisque ils ont interdit purement et simplement la technique de fracturation utilisée aux US comme très gourmande en eau et en produits chimiques (lesquels ? l'eau elle même étant un produit chimique totalement inoffensif).

Curieux tout de même que pour le même problème, essentiellement d'ordre technique, on puisse en arriver à des conclusions aussi fondamentalement différentes....

Source image : http://www.resistons.net

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Energie Gaz de schiste

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par Hervé (IP:xxx.xx1.57.113) le 22 septembre 2011 à 19H07

En fait, la fracturation hydraulique est un procédé utilisé depuis longtemps dans l’industrie pétrolière. La technique est assez fiable dans la mesure ou on a bien étudié le sous sol, et qu’il n’y a pas de nappe d’eau ou de faille à proximité du forage, susceptible de faire remonter le gaz. (Sinon, il y a prise de risque qui peut conduire à un désastre. C’est déjà arrivé). Il semblerait que la technique de la fracturation ait déjà été utilisée en France au début des années 80 pour améliorer le rendement des gisements de gaz à Lacq notamment.

L’interdiction unilatérale de l’utilisation de cette technique est certainement un prétexte pour retarder les échéances (très utile en période électorale). Et puis nous on fait notre électricité avec de l’uranium, pas avec des éoliennes, on a donc moins besoin de gaz...

Mais les inconvénients des gaz de schistes ne se limitent pas à l’emploi de la fracturation hydraulique, le gaz lui même peut être pourri (plus exactement contenir d’autre gaz nocifs qu’il faudra alors se débarrasser). Pour le savoir il faut sonder...

Vous citez : "Je ne sais mais je reste surpris que l’on puisse continuer d’exploiter ces gisements qui représentent désormais 15pct de la production américaine de gaz sans que les autorités en aient interrompus l’exploitation, surtout aprés la catastrophe du Golfe du Mexique alors qu’elle ne se sont pas montrées particulièrement brillantes à cette occasion." La raison est trés certainement que les fuites de gaz, ça se voit pas, ça fait juste chauffer la Planéte, c’est tout...

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par clojea (IP:xxx.xx1.123.37) le 23 septembre 2011 à 08H23

En France, le porte d’entrée du gaz de shiste n’est pas encore fermée. Les pétroliers et gaziers devront prouver qu’ils ont mis au point une autre technique de forage. Mais je fais confiance aux pollueurs, ils vont essayer de trouver le moyen d’endormir tout le monde et de réapparaître là ou on ne les attends plus. On veillera au grain. 500 produits chimiques dans le sol et l’eau. Même un gamin de 5 ans trouverait cela dangereux.

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par Lisa Sion (IP:xxx.xx8.250.80) le 24 septembre 2011 à 12H30

Bonjour,

les US sont prêts à tout pour gonfler leurs potentiel de réserves en gaz afin de contrebalancer la supériorité flagrante des Russes dans ce domaine. http://www.indexmundi.com/map/?v=98... Russie et Iran...tiens tiens tiens... ??? !!!

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