Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin
Organic matter (OM), composed of various macerals, has a strong influence on the enrichment of shale gas. Nevertheless, the connection between OM-hosted pore structure and maceral type is not yet fully understood because of the difficulty to identify the maceral types by traditional scanning electro...
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Frontiers Media S.A.
2021-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.715278/full |
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| author | Qian Pang Qian Pang Qian Pang Guang Hu Guang Hu Chaowei Hu Chaowei Hu Cong Zhang |
| author_facet | Qian Pang Qian Pang Qian Pang Guang Hu Guang Hu Chaowei Hu Chaowei Hu Cong Zhang |
| author_sort | Qian Pang |
| collection | DOAJ |
| description | Organic matter (OM), composed of various macerals, has a strong influence on the enrichment of shale gas. Nevertheless, the connection between OM-hosted pore structure and maceral type is not yet fully understood because of the difficulty to identify the maceral types by traditional scanning electron microscope (SEM). Using a combination of the reflected light microscopy, focused ion beam SEM (FIB-SEM), and Raman spectrum, three maceral types, including alginite, graptolite, and solid bitumen, are identified in the Longmaxi Shale of the Sichuan Basin. The alginate is characterized by the linear arrangement of OM-hosted pores due to the inherited biological structure of benthic algae. Pores in the structureless solid bitumen are randomly distributed with the highest abundance. The graptolite containing pore rarely is unfavorable for the pore generation but can be a good proxy for thermal maturity. Variation in thermal maturity levels accounts for the change of total pore volume in a given marcel type in the Longmaxi Shale obtained from different shale gas fields. |
| first_indexed | 2024-12-22T08:48:33Z |
| format | Article |
| id | doaj.art-b73ac733756c46c7822ed0968eb66751 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-22T08:48:33Z |
| publishDate | 2021-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-b73ac733756c46c7822ed0968eb667512022-12-21T18:32:02ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-08-01910.3389/feart.2021.715278715278Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan BasinQian Pang0Qian Pang1Qian Pang2Guang Hu3Guang Hu4Chaowei Hu5Chaowei Hu6Cong Zhang7The Key Laboratory of Unconventional Petroleum Geology, CGS, Beijing, ChinaState Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaCarbonate Sedimentology, PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaCarbonate Sedimentology, PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaCarbonate Sedimentology, PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, Chengdu, ChinaThe Key Laboratory of Unconventional Petroleum Geology, CGS, Beijing, ChinaOrganic matter (OM), composed of various macerals, has a strong influence on the enrichment of shale gas. Nevertheless, the connection between OM-hosted pore structure and maceral type is not yet fully understood because of the difficulty to identify the maceral types by traditional scanning electron microscope (SEM). Using a combination of the reflected light microscopy, focused ion beam SEM (FIB-SEM), and Raman spectrum, three maceral types, including alginite, graptolite, and solid bitumen, are identified in the Longmaxi Shale of the Sichuan Basin. The alginate is characterized by the linear arrangement of OM-hosted pores due to the inherited biological structure of benthic algae. Pores in the structureless solid bitumen are randomly distributed with the highest abundance. The graptolite containing pore rarely is unfavorable for the pore generation but can be a good proxy for thermal maturity. Variation in thermal maturity levels accounts for the change of total pore volume in a given marcel type in the Longmaxi Shale obtained from different shale gas fields.https://www.frontiersin.org/articles/10.3389/feart.2021.715278/fullorganic matter poresmaceralRaman spectroscopylongmaxi formationSichuan Basin |
| spellingShingle | Qian Pang Qian Pang Qian Pang Guang Hu Guang Hu Chaowei Hu Chaowei Hu Cong Zhang Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin Frontiers in Earth Science organic matter pores maceral Raman spectroscopy longmaxi formation Sichuan Basin |
| title | Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin |
| title_full | Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin |
| title_fullStr | Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin |
| title_full_unstemmed | Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin |
| title_short | Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin |
| title_sort | variation of organic pore structure with maceral types in the longmaxi shale sichuan basin |
| topic | organic matter pores maceral Raman spectroscopy longmaxi formation Sichuan Basin |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.715278/full |
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