Heterogeneity of pore structure of late Paleozoic transitional facies coal-bearing shale in the Southern North China and its main controlling factors

Ge, Taoyuan; Pan, Jienan; Wang, Kai; Liu, Weiqing; Mou, Pengwei; Wang, Xianglong

doi:10.1016/j.marpetgeo.2020.104710

Cited by 26 publications

(23 citation statements)

References 28 publications

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“…In general, the development of OM pores is related to the TOC content and thermal maturity. When Ro is greater than 2%, the number of OM pores will decrease as the Ro increases (Jarvie et al, 2007;Ge et al, 2020). Moreover, a number of microcracks were observed (Figures 4B,D).…”

Section: Pore Morphologymentioning

confidence: 93%

“…The macropores' PV ranges from 0.0029 cm 3 /g to 0.0443 cm 3 /g (Table 3), and the contribution to the pore volume is secondary only to that of mesopores, but its contribution to the SSA is less than 0.5% (Figure 12B). It has been reported that the TOC content has an important effect on the pore structure of shales (He et al, 2016;Ge et al, 2020).…”

Section: Characterization Of the Full-sized Pore Structurementioning

confidence: 99%

“…When the degree of thermal evolution increases, as the degree of compaction increases, the volume of the macropores gradually decreases, until it disappears (Li et al, 2020). In addition, the combination of clay minerals and soluble organic matter plays an important role in the development of micropores in shales (Ge et al, 2020).…”

Section: Effects Of the Clay Content On The Pore Structurementioning

confidence: 99%

“…The characterization of the pore structure plays an important role in shale gas reservoir evaluation and is one of the main factors controlling the enrichment of shale gas Guan et al, 2020;Li et al, 2020;Phaye et al, 2021). Due to the heterogeneity of the pore structure of shales, it is problematic to interpret the occurrence mechanism of shale gas (Liu et al, 2018;Liu R. et al, 2019;Tang et al, 2019;Ge et al, 2020;Luo et al, 2021). Therefore, it is necessary to carry out characterization of shale heterogeneity, and the degree of this strong heterogeneity needs to be investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Tang et al (2019) revealed the characteristics of marine shale and the shale gas adsorption capacity in the Upper Yangtze region, China. Ge et al (2020) studied the characteristics of the transitional shale in southern North China, reporting that shale reservoirs have strong heterogeneity, and analyzed its main controlling factors, which are organic matter maturity and mineral composition.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Full-Sized Pore Structure and Controlling Factors of the Coal-Bearing Shale in the Wuxiang Block, South-Central Qinshui Basin, China

Zhang

Yang

et al. 2022

Front. Earth Sci.

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The characterization of the full-sized pore structure is important for the evaluation and prediction of the reservoir of shale gas with strong heterogeneity. It is of great scientific significance to explore the pore structure characteristics of overmature coal-bearing shale. Core descriptions, X-ray diffraction (XRD), vitrinite reflectance (Ro), field emission scanning electron microscopy (FE-SEM), high-pressure mercury intrusion porosimetry (MIP), and low-pressure N2/CO2 gas adsorption (N2-/CO2-GA) experiments were performed on overmature coal-bearing shale samples from the Wuxiang block, south-central Qinshui Basin, China. The results show that the total organic carbon (TOC) ranged from 0.29 to 8.36%, with an average of 3.84%, and the organic matter (OM) is dominated by type III kerogen. The minerals in the shale primarily consist of clay (43–85.5%, averaging 52.1%) and quartz (12.6–61.2%, averaging 43.5%). The major clay minerals are illite-smectite (I/S) and illite, ranging from 22.5 to 55.6% (mean 41.4%) and 8.7–52.7% (mean 32%), respectively. FE-SEM images reveal that intraparticle pores (IntraP pores) and interparticle pores (InterP pores) are widely developed in clay minerals, and organic pores are occasionally present. Mesopores make the greatest contribution to the total pore volume (PV), and micropores are the major contributors to the specific surface area (SSA). Clays are the main controllers of micropore development. Mesopores developed in the clay mineral layers are promoted by I/S but inhibited by illite. Macropores and microfractures are mainly developed in clays and quartz and do not correlate significantly with the TOC, or mineral composition, due to the influence of compaction and cementation. The TOC and minerals affect pore structure characteristics mainly by influencing micropores.

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Section: Pore Morphologymentioning

confidence: 93%

Section: Characterization Of the Full-sized Pore Structurementioning

confidence: 99%