Average molecular structure model of shale kerogen: Experimental characterization, structural reconstruction, and pyrolysis analysis

Shi, Kanyuan; Chen, Junqing; Pang, Xiongqi; Jiang, Fujie; Hui, Shasha; Zhang, Sijia; Pang, Hong; Wang, Yuying; Chen, Di; Yang, Xiaobin; Li, Bingyao; Pu, Tingyu

doi:10.1016/j.fuel.2023.129474

Cited by 22 publications

(2 citation statements)

References 68 publications

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“…C. Shale maturity can be predicted using the porosity-TOC maturity relationship, as TOC and porosity are calculated from logging data; this will improve the understanding of shale oil-rich mechanisms and sweet spot prediction [50]. D. Kerogen type has a significant influence on physical properties, and the relationship between kerogen type and porosity-TOC maturity function has geochemical significance [51,52]. E. Shale pore controlling factors and evolution vary significantly among regions, and the most suitable porosity measurements need to be tested for a specific region.…”

Section: Future Workmentioning

confidence: 99%

Research on the Shale Porosity–TOC Maturity Relationship Based on an Improved Pore Space Characterization Method

Zhao,

Ke,

Xie

et al. 2024

Energies

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Shale pore structure characterization is key to shale reservoir evaluation, sweet spot selection, and economic exploitation. It remains a challenge to accurately characterize shale micro-nano pores. Common experimental characterization methods for shale pore systems are listed, and advantages and weaknesses of each method are analyzed. An improved pore structure characterization method for shale is proposed by combining Helium and NMR. The new method does not affect shale samples and has a higher accuracy. The affecting factors for shale pore evolution for shale are also discussed, showing that organic matter content and maturity are key factors in total porosity development. Furthermore, a shale porosity–TOC maturity relationship chart is developed based on the experimental data of shale samples selected from six shale reservoirs. The application of this chart in Well X in the Gulong field of Songliao Basin proves its utility in evaluating shale reservoirs.

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Section: Future Workmentioning

confidence: 99%

Research on the Shale Porosity–TOC Maturity Relationship Based on an Improved Pore Space Characterization Method

Zhao,

Ke,

Xie

et al. 2024

Energies

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“…In the 21st century, as the world's demand for hydrocarbons is increasing and conventional oil and gas resources are becoming depleted, unconventional resources are gradually being noticed [1,2]. As a significant proportion of unconventional hydrocarbon resources, shale oil has attracted attention around the world due to its great resource potential [3,4].…”

Section: Introductionmentioning

confidence: 99%

Pore Structure and Geochemical Characteristics of Alkaline Lacustrine Shale: The Fengcheng Formation of Mahu Sag, Junggar Basin

Li,

Hu,

Cao

et al. 2023

Minerals

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Shale oil and gas are currently the major fields of unconventional hydrocarbon exploration and development. The Fengcheng Formation (FF) shale in the Mahu Sag of the Junggar Basin is an alkaline lacustrine organic-rich shale with an extremely prospective shale oil potential. However, its strong heterogeneity and complex pore structure greatly influence the development of shale oil. It is significant to investigate the pore and geochemical characteristics of shale reservoirs for shale oil extraction. In this study, the pore structure and geochemical characteristics of FF have been investigated using core analysis, Rock-Eval pyrolysis, X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), mercury injection capillary pressure (MICP), low-temperature gas adsorption (LTGA), and X-ray computed tomography (X-ray CT). The results show that the shale of FF has moderate organic matter abundance, and the kerogen is mainly of Type II, which is now at the peak of oil generation. Shale minerals are mainly composed of carbonate (dolomite and calcite) and siliceous (quartz and feldspar) minerals, with extremely low clay mineral content. The pore types are mainly intergranular pores (inter-P), intragranular pores (intra-P), and microfractures associated with mineral particles. The pore space is contributed predominantly by micropores of 0.5–1.2 nm and mesopores of 10–50 nm, whereas macropores are underdeveloped. The pores are mostly ink bottle- and slit-shaped, and the pore connectivity is relatively poor. The pore development of shale in the FF is influenced by organic matter abundance, thermal maturity, mineral composition, etc. Organic matter content (TOC), thermal maturity (Ro), and carbonate minerals have a positive effect on pore development, and the pore volume (PV) increases with TOC, Ro, and carbonate minerals. While clay minerals show a negative effect, the PV decreases with clay minerals. Additionally, the influence of the clay mineral content on the pore morphology of shale should not be ignored. This study investigates the pore structure and geochemical characteristics of the alkaline lacustrine shale of FF in Mahu Sag, which is significant to deepen the understanding of alkaline lacustrine shale and to improve the production of shale oil.

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Research on geological characteristics and development potential of Es31 oil and gas reservoir in Nanpu M Block

Zhang,

Liu,

et al. 2024

Heat Mass Transfer

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Average molecular structure model of shale kerogen: Experimental characterization, structural reconstruction, and pyrolysis analysis

Cited by 22 publications

References 68 publications

Research on the Shale Porosity–TOC Maturity Relationship Based on an Improved Pore Space Characterization Method

Research on the Shale Porosity–TOC Maturity Relationship Based on an Improved Pore Space Characterization Method

Pore Structure and Geochemical Characteristics of Alkaline Lacustrine Shale: The Fengcheng Formation of Mahu Sag, Junggar Basin

Research on geological characteristics and development potential of Es31 oil and gas reservoir in Nanpu M Block

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