Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China
The relationship between fracture calcite veins and shale gas enrichment in the deep Ordovician Wufeng Formation–Silurian Longmaxi Formation (Wufeng–Longmaxi) shales in southern Sichuan Basin was investigated through core and thin section observations, cathodoluminescence analysis, isotopic geochemi...
| Principais autores: | , , , , , , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
KeAi Communications Co., Ltd.
2023-12-01
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| coleção: | Petroleum Exploration and Development |
| Assuntos: | |
| Acesso em linha: | http://www.sciencedirect.com/science/article/pii/S1876380424604738 |
| _version_ | 1827578749351100416 |
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| author | Yue CUI Xizhe LI Wei GUO Wei LIN Yong HU Lingling HAN Chao QIAN Jianming ZHAO |
| author_facet | Yue CUI Xizhe LI Wei GUO Wei LIN Yong HU Lingling HAN Chao QIAN Jianming ZHAO |
| author_sort | Yue CUI |
| collection | DOAJ |
| description | The relationship between fracture calcite veins and shale gas enrichment in the deep Ordovician Wufeng Formation–Silurian Longmaxi Formation (Wufeng–Longmaxi) shales in southern Sichuan Basin was investigated through core and thin section observations, cathodoluminescence analysis, isotopic geochemistry analysis, fluid inclusion testing, and basin simulation. Tectonic fracture calcite veins mainly in the undulating part of the structure and non-tectonic fracture calcite veins are mainly formed in the gentle part of the structure. The latter, mainly induced by hydrocarbon generation, occurred at the stage of peak oil and gas generation, while the former turned up with the formation of Luzhou paleouplift during the Indosinian. Under the influence of hydrocarbon generation pressurization process, fractures were opened and closed frequently, and oil and gas episodic activities are recorded by veins. The formation pressure coefficient at the maximum paleodepth exceeds 2.0. The formation uplift stage after the Late Yanshanian is the key period for shale gas migration. Shale gas migrates along the bedding to the high part of the structure. The greater the structural fluctuation is, the more intense the shale gas migration activity is, and the loss is more. The gentler the formation is, the weaker the shale gas migration activity is, and the loss is less. The shale gas enrichment in the core of gentle anticlines and gentle synclines is relatively higher. |
| first_indexed | 2024-03-08T21:50:51Z |
| format | Article |
| id | doaj.art-4e54a9f078544df6a00ff03463b8350b |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-03-08T21:50:51Z |
| publishDate | 2023-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-4e54a9f078544df6a00ff03463b8350b2023-12-20T07:34:02ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042023-12-0150613741385Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW ChinaYue CUI0Xizhe LI1Wei GUO2Wei LIN3Yong HU4Lingling HAN5Chao QIAN6Jianming ZHAO7University of Chinese Academy of Sciences, Beijing 100049, China;; Research Center of Sichuan Basin, PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;; Petroleum Industry Press Co., Ltd., Beijing 100011, China;University of Chinese Academy of Sciences, Beijing 100049, China;; Research Center of Sichuan Basin, PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;; Corresponding author.Research Center of Sichuan Basin, PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;Research Institute of Digital Geology and Energy, Linyi University, Linyi 276000, China;Research Center of Sichuan Basin, PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;MOE Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Daqing 163318, China;Shale Gas Exploration and Development Department, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 610051, China;PetroChina Southwest Oil & Gas Field Company, Chengdu 610056, ChinaThe relationship between fracture calcite veins and shale gas enrichment in the deep Ordovician Wufeng Formation–Silurian Longmaxi Formation (Wufeng–Longmaxi) shales in southern Sichuan Basin was investigated through core and thin section observations, cathodoluminescence analysis, isotopic geochemistry analysis, fluid inclusion testing, and basin simulation. Tectonic fracture calcite veins mainly in the undulating part of the structure and non-tectonic fracture calcite veins are mainly formed in the gentle part of the structure. The latter, mainly induced by hydrocarbon generation, occurred at the stage of peak oil and gas generation, while the former turned up with the formation of Luzhou paleouplift during the Indosinian. Under the influence of hydrocarbon generation pressurization process, fractures were opened and closed frequently, and oil and gas episodic activities are recorded by veins. The formation pressure coefficient at the maximum paleodepth exceeds 2.0. The formation uplift stage after the Late Yanshanian is the key period for shale gas migration. Shale gas migrates along the bedding to the high part of the structure. The greater the structural fluctuation is, the more intense the shale gas migration activity is, and the loss is more. The gentler the formation is, the weaker the shale gas migration activity is, and the loss is less. The shale gas enrichment in the core of gentle anticlines and gentle synclines is relatively higher.http://www.sciencedirect.com/science/article/pii/S1876380424604738Sichuan Basindeep formation in southern Sichuan BasinOrdovician Wufeng FormationSilurian Longmaxi Formationfracturecalcite vein |
| spellingShingle | Yue CUI Xizhe LI Wei GUO Wei LIN Yong HU Lingling HAN Chao QIAN Jianming ZHAO Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China Petroleum Exploration and Development Sichuan Basin deep formation in southern Sichuan Basin Ordovician Wufeng Formation Silurian Longmaxi Formation fracture calcite vein |
| title | Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China |
| title_full | Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China |
| title_fullStr | Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China |
| title_full_unstemmed | Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China |
| title_short | Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China |
| title_sort | enlightenment of calcite veins in deep ordovician wufeng silurian longmaxi shales fractures to migration and enrichment of shale gas in southern sichuan basin sw china |
| topic | Sichuan Basin deep formation in southern Sichuan Basin Ordovician Wufeng Formation Silurian Longmaxi Formation fracture calcite vein |
| url | http://www.sciencedirect.com/science/article/pii/S1876380424604738 |
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