Role of water in hydrocarbon generation from Type-I kerogen in Mahogany oil shale of the Green River Formation

The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

“…The high oil expulsion efficiencies for type I and type II kerogen in the oil window were also validated by geological section studies in the Ordos Basin (Zhang et al, 2006) and Bohai Bay Basin (Pang et al, 2005). Meanwhile, the transformation ratio of oil from type I and II kerogen may reach 60% or more, as evidenced by many laboratory and field observations (Andresen et al, 1995;Pepper and Corvi, 1995;Behar et al, 1997;Lewan, 1997;Xiong et al, 2002;Pan et al, 2010;Lewan and Roy, 2011;Wei et al, 2012). The high transformation ratio, in conjunction with high expulsion efficiency, allows substantial kerogen mass loss during the oil expulsion.…”

“…Thus, we chose a programmed temperature model in this study. The presence of water in the simulation system could also affect the hydrocarbon generation of source rocks containing type I and II kerogen (Lewan, 1997;Lewan and Roy, 2011), which might result in different variations in the kerogen structure in the maturation and oil expulsion efficiencies. At the high maturity stage, water may be not so important as that in the oil window.…”

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

“…There are three major pyrolysis methods: open anhydrous pyrolysis, closed anhydrous pyrolysis and closed hydrous pyrolysis, usually conducted under isothermal or non-isothermal temperatures [16,34,35]. Because of the relative lower final pyrolysis temperature (below 600°C or 650°C) for all previous coal pyrolyses, detailed study on the late gas generation potential of coal is very limited or rare.…”

Organic Facies: Palynofacies and Organic Geochemistry Approaches

“…The role of the water during simulation of oil generation and expulsion was observed in the experiments reported by Comet et al (1986), Tannenbaum et al (1986), Lewan (1993) and Lewan & Roy (2011). These authors observed that the yields of products obtained by hydrous pyrolysis were higher than those obtained with the anhydrous pyrolysis.…”