A preliminary study on the pore characterization of Lower Silurian black shales in the Chuandong Thrust Fold Belt, southwestern China using low pressure N2 adsorption and FE-SEM methods

Tian, Hui; Pan, Lei; Xiao, Xia; Wilkins, R. J.; Meng, Zhaoping; Huang, Baojia

doi:10.1016/j.marpetgeo.2013.07.008

Cited by 479 publications

(301 citation statements)

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“…7 shows the micropore surface area (S mic ) for eight shale samples ranges from 4.97 m 2 /g to 17.94 m 2 /g, which has also a strong positive correlation with the TOC content (R 2 =0.8962). These agree well with previous results from gas shales in North American basins (Chalmers and Bustin, 2008;Ross and Bustin, 2009) and Lower Silurian and Lower Cambrian shales in southwestern China (Tian et al, 2013. They both suggest that organic matters provide important spaces for micropores development in the Lower Silurian shale, which has also been reported in other shales (Milliken et al, 2013;Tian et al, 2013Tian et al, , 2015.…”

Section: Isotherms Of Co 2 Adsorptionsupporting

confidence: 92%

“…As method for micropore size distribution analysis of organic-rich shale, DFT method is now available for CO 2 adsorption system (Tian et al, 2013Wei et al, 2016b;Yang et al, 2016a,b). Pores within the range of 0.3-1.5 nm can be explored with CO 2 at 273.15 K in the relative pressure range of 0.0001-0.03 using DFT method.…”

Section: Density Functional Theory (Dft) Methodsmentioning

confidence: 99%

“…Neutron scattering is not ready yet for general use due to its high costs. Compared with the above methods, low pressure gas adsorption technology can avoid man-made macropore, and can also provide pore parameters such as pore distribution and specific surface area, therefore it has been widely used in the shale nanopore size analysis (Tian et al, 2013Cao et al, 2015;Pan et al, 2015;Zhang et al, 2015;Yang et al, 2016a,b,c;Zeng et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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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.

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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.

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Section: Isotherms Of Co 2 Adsorptionsupporting

confidence: 92%

Section: Density Functional Theory (Dft) Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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.

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“…Therefore, the development and evolution of organic pores becomes an important factor affecting shale porosity. According to the data from literature, shale porosity has a clear positive correlation with TOC content when TOC is within a definite range (Milliken et al 2013;Pan et al 2015;Tian et al 2013;Wang et al 2013a). However, this positive correlation will be changed or even reversed to be negative when TOC is very high, over this range (Milliken et al 2013;Pan et al 2015;Wang et al 2013a).…”

Section: Geological Characteristics Of the Lower Paleozoic Shalementioning

confidence: 99%

“…Compaction not only reduces total porosity, but also changes pore structure significantly. For example, the Lower Cambrian shale from well HY1 has a significantly lower porosity than the Lower Silurian shale from well PY1 (both shales have a similar maturity) (Tian et al 2013, but the former has much higher level of nano-pores (\10 nm) as compared with the latter (Fig. 4), which indicates that the compaction effect is more evident for macropores and larger mesopores, resulting in a reduction of the average pore size and an increase of the micropore volume and specific surface area of the shale.…”

Section: Geological Characteristics Of the Lower Paleozoic Shalementioning

confidence: 99%

Main controlling factors and enrichment area evaluation of shale gas of the Lower Paleozoic marine strata in south China

et al. 2015

Self Cite

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The Lower Paleozoic shale in south China has a very high maturity and experienced strong tectonic deformation. This character is quite different from the North America shale and has inhibited the shale gas evaluation and exploration in this area. The present paper reports a comprehensive investigation of maturity, reservoir properties, fluid pressure, gas content, preservation conditions, and other relevant aspects of the Lower Paleozoic shale from the Sichuan Basin and its surrounding areas. It is found that within the main maturity range (2.5 % \ EqR o \ 3.5 %) of the shale, its porosity develops well, having a positive correlation with the TOC content, and its gas content is controlled mainly by the preservation conditions related to the tectonic deformation, but shale with a super high maturity (EqR o [ 3.5 %) is considered a high risk for shale gas exploration. Taking the southern area of the Sichuan Basin and the southeastern area of Chongqing as examples of uplifted/folded and faulted/folded areas, respectively, geological models of shale gas content and loss were proposed. For the uplifted/folded area with a simple tectonic deformation, the shale system (with a depth [ 2000 m) has largely retained overpressure during uplifting without a great loss of gas, and an industrial shale gas potential is generally possible. However, for the faulted/folded area with a strong tectonic deformation, the sealing condition of the shale system was usually destroyed to a certain degree with a great loss of free gas, which decreased the pressure coefficient and resulted in a low production capacity. It is predicted that the deeply buried shale ([3000 m) has a greater gas potential and will become the focus for further exploration and development in most of the south China region (outside the Sichuan Basin).

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Analysis of Pore Characteristics of Select Indian Shale Samples and Assessment of Pore Connectivity by Conformance Correction of Mercury Intrusion Porosimetry Results

Bakshi¹,

Turlapati²,

Vishal³

et al. 2022

Handbook of Petroleum Geoscience

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A preliminary study on the pore characterization of Lower Silurian black shales in the Chuandong Thrust Fold Belt, southwestern China using low pressure N2 adsorption and FE-SEM methods

Cited by 479 publications

References 45 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

Main controlling factors and enrichment area evaluation of shale gas of the Lower Paleozoic marine strata in south China

Analysis of Pore Characteristics of Select Indian Shale Samples and Assessment of Pore Connectivity by Conformance Correction of Mercury Intrusion Porosimetry Results

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