The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision
BACKGROUND The pore characteristics of shale are one of the key parameters for evaluation of the shale reservoir capacity. Scanning Electron Microscopy (SEM) has been widely used to describe the pore characteristics of shale. However, the classification of micro-pore types in mud shale reservoirs in...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2019-05-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201901160008 |
| _version_ | 1828064967058784256 |
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| author | QI Ming-hui LI Jun-jun CAO Qian |
| author_facet | QI Ming-hui LI Jun-jun CAO Qian |
| author_sort | QI Ming-hui |
| collection | DOAJ |
| description | BACKGROUND The pore characteristics of shale are one of the key parameters for evaluation of the shale reservoir capacity. Scanning Electron Microscopy (SEM) has been widely used to describe the pore characteristics of shale. However, the classification of micro-pore types in mud shale reservoirs in the literature was relatively diverse, and the quantitative characterization of pore based on SEM was relatively lacking. OBJECTIVES To classify the pore types and quantitatively characterize these pores in shale. METHODS 18 shale samples were selected as the research object in this study. Based on the form, position and origin of pores observed by argon ion polishing and Scanning Electron Microscopy, the types of different pores in the sample were classified. By using JMicroVision image analysis software, the pore characteristics including the number of pore types, pore size, face rate, shape coefficient, probability entropy and other parameters were quantitatively described. RESULTS The inter-crystal (particle) pores and organic pores were the most developed, followed by intra-crystal (particle) pores and crystal gap inter-crystal (particle) pores. The sizes of pore were mainly nanometer. The probabilistic entropy of intra-crystal (particle) pores and organic pores were mainly distributed between 0.5 and 0.7, with a different shape coefficient distribution. The shape coefficients of organic pores were mainly distributed between 0.6 and 0.7, and their shape were mainly oval or nearly circular. The shape coefficient of intra-crystal (particle) pores and inter-crystal (particle) pores were mainly between 0.3 and 0.7, which were mainly affected by the original pore morphology, compaction and dissolution. CONCLUSIONS The combination of SEM and JMicroVision is an effective means to quantitatively study the development characteristics of different types of micropores. This work has laid a foundation for the study of the genesis and evolution of micropores. |
| first_indexed | 2024-04-10T23:07:52Z |
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| id | doaj.art-69a4d22d84a047a0942dc8e3f51d410d |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:07:52Z |
| publishDate | 2019-05-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-69a4d22d84a047a0942dc8e3f51d410d2023-01-13T10:06:13ZengScience Press, PR ChinaYankuang ceshi0254-53572019-05-0138326026910.15898/j.cnki.11-2131/td.201901160008ykcs-38-3-260The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVisionQI Ming-hui0LI Jun-jun1CAO Qian2Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, Chengdu 610091, ChinaZhejiang Oilfield Company, China National Petroleum Corporation, Hangzhou 310023, ChinaShale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, Chengdu 610091, ChinaBACKGROUND The pore characteristics of shale are one of the key parameters for evaluation of the shale reservoir capacity. Scanning Electron Microscopy (SEM) has been widely used to describe the pore characteristics of shale. However, the classification of micro-pore types in mud shale reservoirs in the literature was relatively diverse, and the quantitative characterization of pore based on SEM was relatively lacking. OBJECTIVES To classify the pore types and quantitatively characterize these pores in shale. METHODS 18 shale samples were selected as the research object in this study. Based on the form, position and origin of pores observed by argon ion polishing and Scanning Electron Microscopy, the types of different pores in the sample were classified. By using JMicroVision image analysis software, the pore characteristics including the number of pore types, pore size, face rate, shape coefficient, probability entropy and other parameters were quantitatively described. RESULTS The inter-crystal (particle) pores and organic pores were the most developed, followed by intra-crystal (particle) pores and crystal gap inter-crystal (particle) pores. The sizes of pore were mainly nanometer. The probabilistic entropy of intra-crystal (particle) pores and organic pores were mainly distributed between 0.5 and 0.7, with a different shape coefficient distribution. The shape coefficients of organic pores were mainly distributed between 0.6 and 0.7, and their shape were mainly oval or nearly circular. The shape coefficient of intra-crystal (particle) pores and inter-crystal (particle) pores were mainly between 0.3 and 0.7, which were mainly affected by the original pore morphology, compaction and dissolution. CONCLUSIONS The combination of SEM and JMicroVision is an effective means to quantitatively study the development characteristics of different types of micropores. This work has laid a foundation for the study of the genesis and evolution of micropores.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201901160008division of porecharacterization of pore structurescanning electron microscopyjmicrovisionshale |
| spellingShingle | QI Ming-hui LI Jun-jun CAO Qian The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision Yankuang ceshi division of pore characterization of pore structure scanning electron microscopy jmicrovision shale |
| title | The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision |
| title_full | The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision |
| title_fullStr | The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision |
| title_full_unstemmed | The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision |
| title_short | The Pore Structure Characterization of Shale Based on Scanning Electron Microscopy and JMicroVision |
| title_sort | pore structure characterization of shale based on scanning electron microscopy and jmicrovision |
| topic | division of pore characterization of pore structure scanning electron microscopy jmicrovision shale |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201901160008 |
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