Evolution of nanoporosity in organic-rich shales during thermal maturation

Chen, Ji; Xiao, Xia

doi:10.1016/j.fuel.2014.03.058

Cited by 348 publications

(213 citation statements)

References 54 publications

Supporting

Mentioning

186

Contrasting

Order By: Relevance

“…In addition to organic matter abundance, organic matter maturity also plays an important role for micropore development, which has been reported in other shale (Chen and Xiao, 2014). Especially when maturity value (Ro) is greater than 2%, the increase of micropore volume and micropore surface area is very obvious and attributed this to increasing organic matter nanopore with increasing maturation (Mastalerz et al, 2013;Chen and Xiao, 2014;Romero-Sarmiento et al, 2014).…”

Section: Isotherms Of Co 2 Adsorptionmentioning

confidence: 71%

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Chen

Jiang

Liu

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

The pores in shales are mainly of nanometer-scale, and their pore size distribution is very important for shale gas storage and adsorption capacity, especially micropores having widths less than 2 nm, which contribute to the main occurrence space for gas adsorption. This study is focused on the organic-rich Lower Silurian black shale from four wells in the Upper Yangtze Platform, and their total organic carbon (TOC), mineralogical composition and micropore characterization were investigated. Low pressure CO2 adsorption measurement was conducted at 273.15 K in the relative pressure range of 0.0001-0.03, and the micropore structure was characterized by Dubinin-Radushkevich (DR) equation and density functional theory (DFT) method and then the relationship between micropore structure and shale gas adsorption capacity was discussed. The results indicated that (1) The Lower Silurian shale have high TOC content in the range of 0.92-4.96%, high quartz content in the range of 30.6-69.5%, and high clays content in the range of 24.1-51.2%. The TOC content shows a strong positive relationship with the quartz content which suggests that the quartz is mainly biogenic in origin. (2) The micropore volume varies from 0.12 cm 3 /100 g to 0.44 cm 3 /100 g and micropore surface area varies from 4.97 m 2 /g to 17.94 m 2 /g. Both of them increase with increasing TOC content, indicating TOC is the key factor to control the micropore structure of the Lower Silurian shale. (3) Low pressure CO2 adsorption measurement provides the most suitable detection range (0.3-1.5 nm) and has high reliability and accuracy for micropore structure characterization. (4) The TOC content is the key factor to control gas adsorption capacity of the Lower Silurian shale in the Upper Yangtze Platform.

show abstract

Section: Isotherms Of Co 2 Adsorptionmentioning

confidence: 71%

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Chen

Jiang

Liu

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

show abstract

“…The distinct relationships between quartz content and PV and SSA may be due to the different origins of quartz. The biogenic quartz in marine shale typically contained a large number of pores and may work together with OM to change the pore structure in shale [14,19,61], whereas the quartz in marinecontinental transitional shale or continental shale was mainly terrigenous and theoretically contributed little to the SSA and PV and had little influence on the pore structure [56]. Although the types of quartz were not examined for these samples, most of the quartz should not be biogenic according to Figure 3a.…”

Section: Effect Of Mineral Composition On Pore Structurementioning

confidence: 99%

Pore Structure and Fractal Characteristics of Niutitang Shale from China

Tang

Wang

et al. 2018

Minerals

View full text Add to dashboard Cite

A suite of shale samples from the Lower Cambrian Niutitang Formation in northwestern Hunan Province, China, were investigated to better understand the pore structure and fractal characteristics of marine shale. Organic geochemistry, mineralogy by X-ray diffraction, porosity, permeability, mercury intrusion and nitrogen adsorption and methane adsorption experiments were conducted for each sample. Fractal dimension D was obtained from the nitrogen adsorption data using the fractal Frenkel-Halsey-Hill (FHH) model. The relationships between total organic carbon (TOC) content, mineral compositions, pore structure parameters and fractal dimension are discussed, along with the contributions of fractal dimension to shale gas reservoir evaluation. Analysis of the results showed that Niutitang shale samples featured high TOC content (2.51% on average), high thermal maturity (3.0% on average), low permeability and complex pore structures, which are highly fractal. TOC content and mineral compositions are two major factors affecting pore structure but they have different impacts on the fractal dimension. Shale samples with higher TOC content had a larger specific surface area (SSA), pore volume (PV) and fractal dimension, which enhanced the heterogeneity of the pore structure. Quartz content had a relatively weak influence on shale pore structure, whereas SSA, PV and fractal dimension decreased with increasing clay mineral content. Shale with a higher clay content weakened pore structure heterogeneity. The permeability and Langmuir volume of methane adsorption were affected by fractal dimension. Shale samples with higher fractal dimension had higher adsorption capacity but lower permeability, which is favorable for shale gas adsorption but adverse to shale gas seepage and diffusion.

show abstract

“…Kuila and Prasad, 2013;Mastalerz et al, 2013;Chen and Xiao, 2014;Cao et al, 2015). Handbooks are quite clear about low-pressure hysteresis (LPH): any hysteresis below this pressure violates the thermodynamics of equilibrium physisorption, and should, therefore, be related to chemisorption, structural deformation of the sample, or lack of thermodynamic equilibrium (Rouquerol et al, 2014).…”

Section: The Conundrum Of Low-pressure Hysteresismentioning

confidence: 99%

On the use and abuse of N2 physisorption for the characterization of the pore structure of shales

Bertier¹,

Pipich²,

Clarkson³

et al. 2016

Clay Minerals Society Workshop Lecture Series

View full text Add to dashboard Cite

The use of N 2 physisorption for the characterization of the pore structure of shales is assessed by addressing some common pitfalls and misconceptions related to the interpretation of physisorption data. In addition, N 2 physisorption is compared to other methods used to characterize shales. For this purpose a set of pore-structure and total-porosity data from N 2 physisorption, He-pycnometry, Hg-intrusion porosimetry, fluid saturation (Archimedes) methods, and (ultra) small-angle neutron scattering was obtained from measurements on samples of Opalinus Clay.

show abstract

Evolution of nanoporosity in organic-rich shales during thermal maturation

Cited by 348 publications

References 54 publications

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Pore Structure and Fractal Characteristics of Niutitang Shale from China

On the use and abuse of N2 physisorption for the characterization of the pore structure of shales

Contact Info

Product

Resources

About