What is shale gas and fracking? Problems associated with shale gas extraction.
Shales are fine-grained sedimentary rocks formed of organic-rich mud at the bottom of ancient seas.Subsequent sedimentation and the resultant heat and pressure transformed the mud into shale and also produced natural gas from the organic matter contained in it. Over long spans of geologic time, some of the gas migrated to adjacent sandstones and was trapped in … Read more What is shale gas and fracking? Problems associated with shale gas extraction.