Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM
Abstract Knowledge of shale pore structure characteristics is crucial to understand gas storage and seepage mechanisms. Organic matter (OM) pores are considered the most important pore type in shale, and one of the currently significant research questions focuses on the spatial distribution and conn...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-04-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.1331 |
| _version_ | 1797851147006902272 |
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| author | Dong Hui Yan Zhang Yong Hu Xian Peng Longxin Li Zihan Zhao Xixiang Liu Tao Li Yi Pan |
| author_facet | Dong Hui Yan Zhang Yong Hu Xian Peng Longxin Li Zihan Zhao Xixiang Liu Tao Li Yi Pan |
| author_sort | Dong Hui |
| collection | DOAJ |
| description | Abstract Knowledge of shale pore structure characteristics is crucial to understand gas storage and seepage mechanisms. Organic matter (OM) pores are considered the most important pore type in shale, and one of the currently significant research questions focuses on the spatial distribution and connectivity of OM pores. To answer this question, typical OM‐rich siliceous shale samples from the Lower Silurian Longmaxi Formation were comprehensively investigated using focused ion beam scanning electron microscopy. A three‐dimensional model of the OM‐rich region of interest was segmented and reconstructed based on numerous two‐dimensional slices. The types of OM were found to control the development of organic pores, and OM pores including honeycomb‐shaped pores, spongy‐shaped pores, and slit‐like irregular pores are mainly formed in the pyrobitumen. The pore structure parameters of the OM‐rich ROI revealed that the pore size distribution of honeycomb‐shaped OM pores formed in the pyrobitumen was mainly distributed in the range of 10–50 and 80–100 nm, while the throat equivalent diameter distribution demonstrated a unimodal curve with the main peak located at approximately 30 nm. Pore connectivity analysis further indicated that pyrobitumen also contained several isolated nano‐pores, and pores with diameters smaller than 40 nm were poorly connected. Furthermore, permeability simulation revealed clear discrepancies in different directions owing to the heterogeneity of the OM pores. These findings provide experimental evidence for the assessment of shale gas resources and their development potential. |
| first_indexed | 2024-04-09T19:12:05Z |
| format | Article |
| id | doaj.art-0abda959151445da918053f3eecb33c4 |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-04-09T19:12:05Z |
| publishDate | 2023-04-01 |
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| series | Energy Science & Engineering |
| spelling | doaj.art-0abda959151445da918053f3eecb33c42023-04-06T12:27:42ZengWileyEnergy Science & Engineering2050-05052023-04-011141352136910.1002/ese3.1331Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEMDong Hui0Yan Zhang1Yong Hu2Xian Peng3Longxin Li4Zihan Zhao5Xixiang Liu6Tao Li7Yi Pan8College of Petroleum and Natural Gas Engineering, The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan ChinaShale Gas Development Research Institute, Research Institute of Shale Gas PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute, Exploration and Development Research Institue PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute, Exploration and Development Research Institue PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute, Exploration and Development Research Institue PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute, Exploration and Development Research Institue PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaNatural Gas Development Research Institute, Exploration and Development Research Institue PetroChina Southwest Oil & Gasfield Company Chengdu Sichuan ChinaCollege of Petroleum and Natural Gas Engineering, The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan ChinaAbstract Knowledge of shale pore structure characteristics is crucial to understand gas storage and seepage mechanisms. Organic matter (OM) pores are considered the most important pore type in shale, and one of the currently significant research questions focuses on the spatial distribution and connectivity of OM pores. To answer this question, typical OM‐rich siliceous shale samples from the Lower Silurian Longmaxi Formation were comprehensively investigated using focused ion beam scanning electron microscopy. A three‐dimensional model of the OM‐rich region of interest was segmented and reconstructed based on numerous two‐dimensional slices. The types of OM were found to control the development of organic pores, and OM pores including honeycomb‐shaped pores, spongy‐shaped pores, and slit‐like irregular pores are mainly formed in the pyrobitumen. The pore structure parameters of the OM‐rich ROI revealed that the pore size distribution of honeycomb‐shaped OM pores formed in the pyrobitumen was mainly distributed in the range of 10–50 and 80–100 nm, while the throat equivalent diameter distribution demonstrated a unimodal curve with the main peak located at approximately 30 nm. Pore connectivity analysis further indicated that pyrobitumen also contained several isolated nano‐pores, and pores with diameters smaller than 40 nm were poorly connected. Furthermore, permeability simulation revealed clear discrepancies in different directions owing to the heterogeneity of the OM pores. These findings provide experimental evidence for the assessment of shale gas resources and their development potential.https://doi.org/10.1002/ese3.1331connectivityOM porespore structurepyrobitumenshale gasspatial distribution |
| spellingShingle | Dong Hui Yan Zhang Yong Hu Xian Peng Longxin Li Zihan Zhao Xixiang Liu Tao Li Yi Pan Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM Energy Science & Engineering connectivity OM pores pore structure pyrobitumen shale gas spatial distribution |
| title | Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM |
| title_full | Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM |
| title_fullStr | Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM |
| title_full_unstemmed | Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM |
| title_short | Study on the distribution and connectivity of organic matter pores in Longmaxi shale based on 2D and 3D FIB‐SEM |
| title_sort | study on the distribution and connectivity of organic matter pores in longmaxi shale based on 2d and 3d fib sem |
| topic | connectivity OM pores pore structure pyrobitumen shale gas spatial distribution |
| url | https://doi.org/10.1002/ese3.1331 |
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