| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
WANG Kunyang, DU Gu, WANG Guan, HE Jiale. The Morphological Characteristics of Clay Minerals in a Tight Sandstone Reservoir by Atomic Force Microscopy[J]. Rock and Mineral Analysis, 2025, 44(2): 245-253. doi: 10.15898/j.ykcs.202404040075
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The Morphological Characteristics of Clay Minerals in a Tight Sandstone Reservoir by Atomic Force Microscopy
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Abstract
Clay minerals, as one of the main components of unconventional oil and gas reservoirs, have significant implications for the evaluation of unconventional oil and gas reservoirs in terms of their fine characterization of nano/sub-nano morphological features. By using atomic force microscopy (AFM) micro-area analysis technology, the problem of secondary modification of nano-pore structure caused by the conductive film in the pretreatment process of electron microscopy was solved; it made up for the defect that electron microscopy requires the sample to be conductive and can directly observe the morphological characteristics of the sample. Here, it was observed through AFM, that in the late diagenetic stage of the tight sandstone of the Xujiahe Formation in western Sichuan, some clay minerals developed parallel stepped stripes, with a large number of nano-pores formed at the concave angles on both sides of the steps, which were the main components of inorganic pores. Secondly, clay minerals had the same diagenetic evolution sequence, but their crystal morphologies were different, indicating that there was a spatial coupling relationship between their morphological features and diagenesis. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202404040075 . -
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References
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WANG Kunyang, DU Gu, WANG Guan, HE Jiale. The Morphological Characteristics of Clay Minerals in a Tight Sandstone Reservoir by Atomic Force Microscopy[J]. Rock and Mineral Analysis, 2025, 44(2): 245-253. doi: 10.15898/j.ykcs.202404040075
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Figure 1.
Morphological characteristics of illite-smectite mixed-layer clay minerals: (a) Three-dimensional stacking of the growth layer; (b) Transverse morphology characteristics of the growth layer; (c) Longitudinal morphology characteristics of the growth layer.
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Figure 2.
Morphologic characteristics of chlorite: (a) Chlorite longitudinal no-gap superposition; (b) Plane morphology of chlorite growth layer; (c) Near-regular polygon of chlorite
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Figure 3.
Mineral morphologies of illite in 10μm×10μm large field of view: (a) Morphology characteristics of illite microcrystalline aggregate; (b) Morphology of scaly illite; (c) Morphological characteristics of illite aggregate.
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Figure 4.
Mineral morphologies of illite in 1μm×1μm fine scanning images: (a) Morphology of illite growth layer; (b) Morphology of illite regular growth layer; (c) Illite growth layer space stacking.