Factors controlling the thermo-mechanical deformation of oil shales: Implications for compaction of mudstones and exploitation

Evolution of petrophysical properties of oil shales during high-temperature compaction tests: Implications for petroleum expulsion

“…The BET specific surface area values are also lower compared to those determined by the same method for some clays studied by Djéran-Maigre et al (1998). This is consistent with the presence of silt to sand-sized particles in these samples (Eseme et al, 2006). BET specific surface areas similar to those of the oil shales studied have been reported for other mudstones as well as coals (Schlömer and Krooss, 1997;Yang and Aplin, 1998;Prinz et al, 2004).…”

“…Results of uniaxial unconfined compressive loading experiments on the sample set analysed here have been reported previously (Eseme et al, 2006). During high-temperature experiments, the deformation of the sample plugs resulting from the combined effects of loading and controlled heating was analysed.…”

“…Details on geochemistry, petrology and rock mechanical characteristics of the samples studied are reported in Eseme et al (2006). A summary of parameters relevant to fluid transport for various samples is given in Table 1.…”

The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs

“…In an attempt to elucidate the complex pore structure of shales, researchers have utilized low pressure N 2 sorption isotherms, He pycnometry and Hg porosimetry (Katsube and Williamson, 1994;Yang and Aplin, 1998;Katsube et al, 1998;Eseme et al, 2006). Pore size distributions and total pore volumes of shales and mudrocks are also reported under variable confining pressures and effective stresses (e.g.…”

An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock

“…A series of experimental studies including mechanical behavior investigations and microstructure analysis of various kinds of soft rocks has been performed [1][2][3][4][5][6][7][8][9][10][11][12]. The results have shown that the mechanical behavior of the soft rocks after saturation is very complex and is characterized by various features such as elasto-plasticity, strain hardening, and performance deterioration.…”