Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China
Amounts of silty laminae in continental shale gas reservoir were investigated in the Zhangjiatan shale of the Yanchang Formation, Ordos Basin. The purpose of this study is to provide awareness in terms of the nature and discrepancies in pore structure between silty laminae and clayey laminae. By mec...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2016-08-01
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| Series: | Journal of Natural Gas Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468256X1630058X |
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| author | Yuxi Yu Xiaorong Luo Yuhong Lei Xiangzeng Wang Lixia Zhang Chengfu Jiang Wan Yang Ming Cheng Likuan Zhang |
| author_facet | Yuxi Yu Xiaorong Luo Yuhong Lei Xiangzeng Wang Lixia Zhang Chengfu Jiang Wan Yang Ming Cheng Likuan Zhang |
| author_sort | Yuxi Yu |
| collection | DOAJ |
| description | Amounts of silty laminae in continental shale gas reservoir were investigated in the Zhangjiatan shale of the Yanchang Formation, Ordos Basin. The purpose of this study is to provide awareness in terms of the nature and discrepancies in pore structure between silty laminae and clayey laminae. By mechanically separating the silty laminae from the shale core, a combination measurement series of mercury injection capillary pressure, N2 adsorption, and carbon dioxide adsorption were performed on the aforementioned two parts. An integrated pore size distribution, with a pore diameter range of 0.1 nm-100 μm, was obtained by using appropriate sample particle size and calculation model. The comparative analysis of the pore structure shows that the clayey laminae are dominated by mesopore and micropore; meanwhile, the silty laminae are dominated by macropore alone. The pore volume distribution in clayey laminae is sorted as mesopore volume > micropore volume > macropore volume, on the other hand, for silty laminae it is macropore volume > mesopore volume > micropore volume. The averaged total pore volume of silty laminae is 2.02 cc/100 g, and for clayey laminae, it is 1.41 cc/100 g. The porosity of silty laminae is 5.40%, which is greater than that of clayey laminae's 3.67%. Since silty laminae have larger pore width and pore space, they are more permeable and porous than the clayey laminae; it also acts as a favorable conduit and reservoir for shale gas. |
| first_indexed | 2024-03-12T09:15:49Z |
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| issn | 2468-256X |
| language | English |
| last_indexed | 2024-03-12T09:15:49Z |
| publishDate | 2016-08-01 |
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| series | Journal of Natural Gas Geoscience |
| spelling | doaj.art-4504b82e3db94fe0b4d2abfffe5ec5ef2023-09-02T14:50:59ZengKeAi Communications Co., Ltd.Journal of Natural Gas Geoscience2468-256X2016-08-011429930810.1016/j.jnggs.2016.10.001Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, ChinaYuxi Yu0Xiaorong Luo1Yuhong Lei2Xiangzeng Wang3Lixia Zhang4Chengfu Jiang5Wan Yang6Ming Cheng7Likuan Zhang8Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaShaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an 710075, ChinaShaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an 710075, ChinaShaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an 710075, ChinaKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaAmounts of silty laminae in continental shale gas reservoir were investigated in the Zhangjiatan shale of the Yanchang Formation, Ordos Basin. The purpose of this study is to provide awareness in terms of the nature and discrepancies in pore structure between silty laminae and clayey laminae. By mechanically separating the silty laminae from the shale core, a combination measurement series of mercury injection capillary pressure, N2 adsorption, and carbon dioxide adsorption were performed on the aforementioned two parts. An integrated pore size distribution, with a pore diameter range of 0.1 nm-100 μm, was obtained by using appropriate sample particle size and calculation model. The comparative analysis of the pore structure shows that the clayey laminae are dominated by mesopore and micropore; meanwhile, the silty laminae are dominated by macropore alone. The pore volume distribution in clayey laminae is sorted as mesopore volume > micropore volume > macropore volume, on the other hand, for silty laminae it is macropore volume > mesopore volume > micropore volume. The averaged total pore volume of silty laminae is 2.02 cc/100 g, and for clayey laminae, it is 1.41 cc/100 g. The porosity of silty laminae is 5.40%, which is greater than that of clayey laminae's 3.67%. Since silty laminae have larger pore width and pore space, they are more permeable and porous than the clayey laminae; it also acts as a favorable conduit and reservoir for shale gas.http://www.sciencedirect.com/science/article/pii/S2468256X1630058XShale gasLacustrine shalePore structureSilty laminaeOrdos Basin |
| spellingShingle | Yuxi Yu Xiaorong Luo Yuhong Lei Xiangzeng Wang Lixia Zhang Chengfu Jiang Wan Yang Ming Cheng Likuan Zhang Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China Journal of Natural Gas Geoscience Shale gas Lacustrine shale Pore structure Silty laminae Ordos Basin |
| title | Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China |
| title_full | Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China |
| title_fullStr | Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China |
| title_full_unstemmed | Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China |
| title_short | Characterization of lacustrine shale pore structure: The Upper-Triassic Yanchang Formation, Ordos Basin, China |
| title_sort | characterization of lacustrine shale pore structure the upper triassic yanchang formation ordos basin china |
| topic | Shale gas Lacustrine shale Pore structure Silty laminae Ordos Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2468256X1630058X |
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