2020
DOI: 10.1016/j.fuel.2019.116917
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Evaluation of gas contents for a multi-seam deep coalbed methane reservoir and their geological controls: In situ direct method versus indirect method

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Cited by 69 publications
(38 citation statements)
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“…Similar conclusions have been made in previous studies; that is, quartz content decreases with increasing TOC content [58]. However, some scholars support different conclusions that quartz content increases with increasing TOC content in marine shales [20,[59][60][61]. This finding may be due to the different origins of quartz in different types of shales.…”
Section: Composition Of the Shale Samples With Type III Kerogen Formesupporting
confidence: 82%
“…Similar conclusions have been made in previous studies; that is, quartz content decreases with increasing TOC content [58]. However, some scholars support different conclusions that quartz content increases with increasing TOC content in marine shales [20,[59][60][61]. This finding may be due to the different origins of quartz in different types of shales.…”
Section: Composition Of the Shale Samples With Type III Kerogen Formesupporting
confidence: 82%
“…However, due to the relatively loose structure of coal seam, CAL is prone to expansion in coal seam (Safar et al., 2009; Vieira et al., 2007) and can be affected by the coalbed methane content with changes of inverse (Hamada and Hegaxy, 2007; Trcka et al., 2006). The coal types has a close relationship with the SP log (Hou, 2000), and the detection depth of RLLD is higher than that of RLLS. Previous researchers reviewed that the geophysical log responses of coal components include the followings: 1) low ash yield generally corresponds to low DEN and GR logging values (Chatterjee and Paul, 2013; Ghosh et al., 2014); 2) the higher V daf content commonly along with the greater DEN and GR logging values; 3) the FC ad content is negatively correlated with DEN and GR logging data (Fu et al., 2009b).…”
Section: Introductionmentioning
confidence: 95%
“…However, the correlation among different coal components and log parameters exhibit a relatively large variation (Figures 3 to 5). Generally, different well logs contribute various responses to coal seam, for example, low GR and DEN, negative abnormality of SP, and high AC, RLLS, and RLLD values have been detected in coal seam (Fu et al., 2009a; Hou, 2000; Rai et al., 2004; Roger, 2005). In this study, we selected the well logs of DEN, GR, AC, SP, RLLS, and RLLD to identify coal seam and evaluate coal components.…”
Section: Establishment Of the Relationship Between Log Parameters And Coal Componentsmentioning
confidence: 99%
“… 6 , 7 Gas content estimation methods include direct and indirect methods. 8 − 10 The former uses a canister desorption measurement from core coal samples by measuring desorbed, lost, and residual gas contents, respectively. 11 For this method, the lost gas content is obtained using graphic and analytical methods based on plots of the desorption times versus initial desorption points.…”
Section: Introductionmentioning
confidence: 99%