Pore characterization of isolated organic matter from high matured gas shale reservoir

Ji, Wenming; Yan, Song; Rui, Zhenhua; Meng, Mianmo; Huang, Hexin

doi:10.1016/j.coal.2017.03.005

Cited by 136 publications

(84 citation statements)

References 30 publications

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“…These isotherms represent both mesopores and macropores in isolated OM and bulk shales. Isotherms of samples J4-3, J4-4 and J4-5 (TOC > 2.5 wt%) show adsorption at a low relative pressure, indicating the existence of micropores [13,40,58]. These characteristics are consistent with the low-pressure CO 2 adsorption data.…”

Section: Low-pressure N 2 Physisorptionsupporting

confidence: 83%

“…The homogeneities of OM type and thermal maturity in the W-L shale samples in this work evidence the similar PSD curves of the isolated OM. In addition, the similar shapes of the PSD curves may also support the application of OM isolation from bulk shale for the characterization of OM pores [39,40,45].…”

Section: Comparison Of Psds Between Isolated Om and Bulk Shalesmentioning

confidence: 66%

“…Rexer et al (2014) proposed an effective OM isolation process that does not alter the pore structure [39]. Therefore, OM isolation from bulk shale provides an effective way to characterize OM pores [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…The pore characteristics of Wufeng-Longmaxi (W-L) shale in China were studied by Chinese scholars using various techniques. Quantitative pore structure parameters (i.e., pore size distribution, pore volume and surface area, and pore connectivity) were studied by fluid intrusion methods [20,[33][34][35][36][37]40,42,[52][53][54]. OM pore characterization of W-L shale in China has gained increasing research attention and OM types and OM pore networks have been qualitatively investigated by the FE-SEM imaging technique [14,31,32,35,36].…”

Section: Introductionmentioning

confidence: 99%

“…OM pore characterization of W-L shale in China has gained increasing research attention and OM types and OM pore networks have been qualitatively investigated by the FE-SEM imaging technique [14,31,32,35,36]. Ji et al (2017) reported that OM pores in W-L shale were characterized using isolated OM samples [40]. However, they did not quantitatively study the proportions of OM pores.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO2 and N2 Adsorption

Jiang

et al. 2019

Energies

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Organic matter (OM) pores are significant for shale gas accumulation and flow mechanisms. The pores of Wufeng-Longmaxi (W-L) shale in the Sichuan Basin, China have been extensively characterized, however, the proportion of OM pores in this shale have not been adequately discussed. In this study, the contribution of OM pores to the total pore volume of W-L shale was quantitatively studied through the analysis of OM isolation, field emission scanning electron microscopy (FE-SEM) and low-pressure CO2 and N2 adsorption (LPGA). FE-SEM images showed abundant OM pores, interparticle pores and intraparticle pores with various shapes and widths in the W-L shales. The pore size distribution (PSD) of the isolated OM from five shale samples showed a consistent, unimodal pattern. The pore volume of isolated OM was greater than that of the bulk shale samples, suggesting that OM is more porous than the inorganic compositions in shales. The average contribution of OM to the volumes of micropores, mesopores and macropores was 58.42%, 10.34% and 10.72%, respectively. Therefore, the pore volume of the W-L shale was dominantly related to inorganic minerals. This was probably due to the small weight ratio of OM in the shale samples (1.5 wt%–4.2 wt%). The findings of this study reveal the different effects of OM and minerals on pore development, and provide new insights into the quantitative contribution of OM pores to the total pore volume of the W-L shale.

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Section: Low-pressure N 2 Physisorptionsupporting

confidence: 83%

Section: Comparison Of Psds Between Isolated Om and Bulk Shalesmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO2 and N2 Adsorption

Jiang

et al. 2019

Energies

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A comprehensive review on the flow behaviour in shale gas reservoirs: Multi‐scale, multi‐phase, and multi‐physics

Feng

Chen

et al. 2022

Can J Chem Eng

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An accurate description of fluid flow is critical for the prediction of the productivity of shale gas reservoirs. In this paper, we present the current advances and a systematic summary on the fluid flow in shale gas reservoirs. First, shale pore structures, consisting of organic pores and inorganic pores ranging from nanoscale to micro-scale, and reservoir fluids, including free gas, absorbed gas, and water, are systematically presented. Thereafter, multi-physics flow phenomena motivated by scale effects, such as continuum flow, slip flow, transition flow, free molecular flow, and surface diffusion for gas, as well as the effective viscosity and slip boundary condition for water, are carefully summarized. Meanwhile, these flow mechanisms are discussed with molecular dynamics (MD) simulations and theoretical analysis. Subsequently, on the basis of upscaling approaches, including capillary bundle models, the lattice Boltzmann method (LBM), and pore network models (PNMs), fluid flow through heterogeneous shale matrix is reviewed and the influences of scale effects and pore structures are clarified. Additionally, shale gas well performance is discussed by combining the multiple transport mechanisms and a fracturing-shut-in-flowback-production process. Our review concluded that the fluid flow behaviour in shale gas reservoirs is a complex multi-scale process accompanied by multi-physical phenomena and multi-fluid distributions. Keeping this in mind is helpful for predicting the shale gas production and recoverable gas resources. We expect this study can not only help by providing a better understanding of the fluid flow in shale reservoirs but also provide significant implications to address other multiphase flow processes.

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Effect of lithofacies on pore structure of the Cambrian organic‐rich shale in northern Guizhou, China

Xia

et al. 2020

Geological Journal

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Taking the Cambrian organic‐rich shale in northern Guizhou for research object, total organic carbon (TOC), and X‐ray diffraction (XRD) were used to study shale lithofacies, and scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and nitrogen adsorption analyses were combined to reveal pore structure, in order to document the effect of shale lithofacies on pore structure. The results show that the Niutitang shale can be divided into six shale lithofacies, and three (siliceous shale lithofacies, carbonate‐rich siliceous shale lithofacies, and carbonaceous/argillaceous containing siliceous shale lithofacies) of them can be identified. Four types of pores (organic matter, interparticle, intraparticle, and dissolved pores) are present in the Niutitang shale. Organic matter and interparticle pores mainly occur in siliceous shales, and intraparticle and dissolved pores typically develop in carbonate‐rich siliceous shales and carbonaceous/argillaceous containing siliceous shales. Organic matter and brittle minerals related pores are two significant components of the pore volume in the Niutitang shales. The micropores and mesopores volumes promptly increase with the increase in organic matter content, indicating that organic matter is the primary contributor to micropores and mesopores. Clay content shows weakly negative relations with both the micropore and mesopore volumes. The development of macropores is associated with inorganic minerals (i.e., clay and carbonate). Organic matter and clay contribute the most to specific surface area, while the contribution of brittle minerals is negligible. Siliceous shales are the most favourable reservoir for shale gas due to their tremendous specific surface area and pore volume. In contrast, carbonate‐rich siliceous shales have the least storage capacity of shale gas because of their relatively smaller specific surface area and pore volume.

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Pore characterization of isolated organic matter from high matured gas shale reservoir

Cited by 136 publications

References 30 publications

Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO2 and N2 Adsorption

Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO2 and N2 Adsorption

A comprehensive review on the flow behaviour in shale gas reservoirs: Multi‐scale, multi‐phase, and multi‐physics

Effect of lithofacies on pore structure of the Cambrian organic‐rich shale in northern Guizhou, China

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