Unconventional shale-gas systems: The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment

Lower Famenian inter-salt deposits (Belarus) have been studied comprehensively.The microlithofacies are as follows: laminated organic-carbonate-silica rock; massive limestone; radiolarite; algal limestone; massive dolomite; porous dolomite; dolomite of indistinct lumpy texture.Rocks contain pores of dissolved radiolarians, cracks of fluid auto-fracturing and weakened zones encountered in the secondary transformations.Rocks of Domanic type in the Central oil area of the Pripyat can be oil-bearing and oil-generating ones.