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• W2092584589 abstract "Abstract Shale gas is generally believed to have been stored in forms of free compressed gas in open pores and cracks, as adsorbed gas on the surfaces of kerogen or clay minerals and as diffused gas stored within the solid organic matter (Bowker, 2007, Sondergeld et al., 2010). The nano-pores[1], which have a great effect on the shale gas occurrences, are the predominant pore type in the Barnett mudstones (Loucks et al., 2009). Therefore, it is important to understand the pore network and shale gas storage mechanism. This study aims to reveal the key affecting factors of pore development, and establish a shale gas prospect evaluation model as a function of pressure and temperature of overmature shale. A set of outcrop and downhole samples were selected from the Sichuan marine basin and the Bohai bay lacustrine basin of China, and an immature shale outcrop sample from the Fushun Basin, northeastern China was used for pyrolysis experiment. A series of nano-pore description methods, such as FESEM, CO2 low pressure isotherm analysis (D-R method), N2 low pressure isotherm analysis (BET theory), Hg porosimetry were used to observe pore size, morphology, and abundance in gas shale. Methane adsorption capacity was measured use the isotherm adsorption system from TerraTek. The N2 gas adsorption at low temperature and pressure (BET theory) (Bustin et al., 2008) showed that, with increasing pyrolysis temperature, the surface areas increase from 354 m2/kg (sample FS-300) to 3,102 m2/kg (sample FS-600) (Table 1), and pore volumes increase from 0. 6448 cc/kg (sample FS-300) to 10.89 cc/kg (sample FS-600) (Table 1; Figure 1), indicating that additional pores had developed in the solid products during the progressive pyrolysis. Pore volumes increase as the pyrolysis temperature increases, indicating that the pore volume in the organic matter can increase significantly during shale maturation (Table 1). Scanning Electron Microscopic (SEM) observation of the pyrolysis residues indicates that with increasing pyrolysis temperature, the pores in the shale become more abundant. The sample of low-pyrolysis temperature contains fewer and relatively small pores compared with that of high- pyrolysis temperature (Figure 2). Sample a, which was pyrolysed at 300 ?, corresponds to the low end of the hydrocarbon generation window. There are few micro-pores in the organic matter with the surface of the organic matter being relatively flat. The pore networks in Sample b which was pyrolysed at a higher temperature of 550? contains abundant pores developed in the organic matter, which are in sharp contrast with that in Sample a. This is consistent with the intraparticle organic nano-pores interpreted to be of thermal maturation origin by Loucks et al. (2009) in the Barnett mudstones, where the nanopores most commonly have irregular, bubblelike, elliptical cross sections and range between 5 and 750 nm." @default.
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• W2092584589 date "2013-03-26" @default.
• W2092584589 modified "2023-09-28" @default.
• W2092584589 title "Overmature Shale Gas Storage Capacity Evaluation" @default.
• W2092584589 doi "https://doi.org/10.2523/iptc-16774-abstract" @default.
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