Comparison of generative capacities for bitumen and gas between Carboniferous coals from Donets Basin (Ukraine) and a Cretaceous coal from Sabinas–Piedras Negras Basin (Mexico) during artificial maturation in confined pyrolysis system

Distribution of thermogenic methane in Carboniferous coal seams of the Donets Basin (Ukraine): “Applications to exploitation of methane and forecast of mining hazards”

“…The decreasing of porosity values for R r =1-3 is related to the generation of bitumen that stay in pores and also to the pressure effect (porosity decreasing), then the increasing of porosity for R r N 3 is related to the cracking of bitumen into gas that escaped and/or adsorbed in micropores. The capacity of methane adsorption in coal decreases upon %R r of 3-3.5 due to the disappearing of micropores and the generation of vacuoles (Huang, 1999;Alsaab et al, 2007b). Thus if we go far, till %R r of 4 the adsorption capacity will decrease too.…”

“…Different pyrolysis systems, such as open (Krooss et al, 1995;Friberg et al, 2000;Cramer, 2004), anhydrous closed (Higgs, 1986), hydrous (Kotarba and Lewan, 2004), MSSV (Schenk and Horsfield, 1998), and confined (Piedad-Sánchez et al, 2005) have been used to estimate the gas-generating potential of Carboniferous coals. Two Carboniferous coals from the Donets Basin in the Ukraine (Alsaab et al, 2007b) were pyrolysed in a confined pyrolysis system, covering a maturity range from 1.07 to 2.78%R r . Methane was quantified and its evolution with coal rank was reported by Alsaab et al (2008a).…”

Coal pyrolysis characteristics by TG–MS and its late gas generation potential

“…model gas generation from coal in laboratory, in particular, the gas generation process, characteristics and distribution patterns have been studied intensively [12][13][14][15][16][17][18][19]. But there also raises new questions, such as the dispute over the upper limit of thermal maturity (deadline Ro) for gas generation from coal-bearing OM (organic matter) or the late gas generation potential.…”

Palaeozoic source rocks in the Dniepr–Donets Basin, Ukraine

“…Because of high liptinite contents (and despite abundant inertinite), the coal from well Sav 361 is oil-prone and will generate sulphur-poor Paraffinic-Naphthenic-Aromatic oil at relatively low temperatures. It is important to note that Alsaab et al (2007) studied Serpukhovian coal from the South Donbas district and suggested that these coals are also oil-prone. The sapropelite overlying the coal is characterized by a maceral assemblage similar to that of coal.…”