in addition to conventional gas india has estimated coalbed methane cbm resources between of tern and tern mainly in the east in the area of the coal resources just bcm of cbm have been produced in but it is planned to expand production to bcm by srivastava the damodar basin in west bengal and the cambay basin in gujarat are according to the stateowned oil and natural gas corporation of india ongc promising formations for shale gas in november the us and indian governments announced that the us geological survey will help india to assess its shale gas reserves