...- tion investments are focused on the deep-seated anticlines which involve the Devonian fractured quartzites and have proven to host giant gas fields. Due mainly to the structural complexity of the subandean anticlines, the seismic has not yielded good results. In fact, the discoveries of these giant gas...

.... The proportion of lipid to mixed/humic sources which generated the gas of 152 giant gas fields, is estimated at 2: 1. The most important source rock ages in 152 gas fields are Jurassic (33.1%), Cretaceous (28.4%), Gothlandian (14.6%), Devonian (9.1%), Tertiary (7.5%) and Carboniferous (5%). These percentages...