Evaluation of pore size spectrum of gas shale reservoirs using low pressure nitrogen adsorption, gas expansion and mercury porosimetry: A case study from the Perth and Canning Basins, Western Australia

Nanopore structure characterization for organic-rich shale using the non-local-density functional theory by a combination of N2 and CO2 adsorption

“…55 However, different type classifications were suggested for these N 2 adsorption isotherms. For example, the Perth, Canning, and Western Canada samples showed isotherms of Type I [36], II [24], and IV [25], respectively, according to the IUPAC classification of adsorption isotherms and hysteresis loops [21]. Here, we suggest that the N 2 isotherm is a composite of Types I(b), II, and IV(a).…”

“…Fig. 1 presents the N 2 isotherms of a few typical organic-rich shale samples from the Sichuan Basin, China, which are similar to those of the Perth and Canning shales [25], and mudstone from the Western Canada Basin. 55 However, different type classifications were suggested for these N 2 adsorption isotherms.…”

“…For example, specific surface area is usually calculated from N 2 adsorption data by the BrunauereEmmetteTeller (BET) [26] and t-plot [27e31] methods, and pore volume is generally assessed from CO 2 adsorption data by the DubinineRadushkevich (DeR) model [32] and from N 2 adsorption data by the BarretteJoynereHalenda (BJH) method [33]. Pore size distributions are mostly determined by the BJH method [8,11] and density functional theory [34] (DFT) or non-local DFT (NLDFT) [5,24,25,35,36]. However, these popular methods of characterizing pure porous materials or millimeter-tomicron scale conventional reservoirs are not normally effective for studying the complex nanopores in shale.…”

Processo para produção e caracterização de rochas sintéticas com porosidade controlada para aplicações em Petrofísica por RMN de alto e baixo campo.

“…As medidas de porosidade efetiva (figura 11) foram realizadas em um porosímetro a gás (hélio) de fabricação própria da PETROBRÁS, através da técnica de expansão livre [18]. As medidas de permeabilidade (figura 12) foram realizadas em um permeâmetro a gás (nitrogênio) através da técnica de estado estacionário [19], sob uma pressão de confinamento de 500psi.…”

The effect of sample particle size on the determination of pore structure parameters in shales

“…Tian et al (2013Tian et al ( , 2015 ground shale samples into grains of 60-80 mesh (250-180 μm) and 60-100 mesh (250-150 μm), and Zelenev et al (2011) ground samples to 40 mesh (b380 μm). Many researchers ground samples so they pass through a 60 mesh sieve (b250 μm) (Chalmers and Bustin, 2007;Bustin, 2007, 2009;Chalmers et al, 2012;Clarkson et al, 2013;Labani et al, 2013;Lahann et al, 2013;Wang et al, 2014). However, in other studies samples have been ground to 70 mesh (b200 μm; Tan et al, 2014aTan et al, , 2014bYang et al, 2014), 80 mesh (b180 μm; Guo et al, 2014), and 100 mesh (b 150 μm; Wang et al, 2013;Cao et al, 2015).…”