Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation
The Permian Taiyuan and Shanxi coal-bearing formations are recognized as the primary source rocks and promising shale gas reservoirs in North China. Based on lithologic observations, mineral and major elemental analyses of the Shanxi Sahle in the Southern North China Basin (SNCB), we conducted a pre...
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KeAi Communications Co., Ltd.
2025-04-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666519025000172 |
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| author | Qian Chen Pei Li Xiaoliang Wei Changsheng Chen Wei Dang Haikuan Nie Jinchuan Zhang |
| author_facet | Qian Chen Pei Li Xiaoliang Wei Changsheng Chen Wei Dang Haikuan Nie Jinchuan Zhang |
| author_sort | Qian Chen |
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| description | The Permian Taiyuan and Shanxi coal-bearing formations are recognized as the primary source rocks and promising shale gas reservoirs in North China. Based on lithologic observations, mineral and major elemental analyses of the Shanxi Sahle in the Southern North China Basin (SNCB), we conducted a preliminary investigation into the depositional environment, climate, and factors controlling the organic matter (OM) accumulation. The main findings are as follows: (1) The Shanxi Formation results from a transition in depositional environment, shifting from tidal flats to delta plains. The Shanxi Shale is primarily composed of clay minerals (34.24 %–75.20 %) and quartz (23.80%–46.39 %), with a notably low carbonate content (<5 %). (2) Illite in the lower sections of the Shanxi Shale is likely sourced from detrital input rather than chemical conversion, while the dissolution of potassium feldspar may account for the elevated kaolinite content. This is further supported by the oxygen level variations between the lower and upper shale intervals. Moreover, no significant positive correlation was observed between SiO2 and Al/Na ratios, nor between clay minerals and total organic carbon (TOC) content. This suggests that the intensity of OM modification prior to diagenesis plays a pivotal role in OM accumulation, aligning with the positive correlation between inertinite proportion and TOC content. (3) Organic matter inputs from fluvial systems were likely influenced by upstream mire conditions, where precursor peat may have accumulated. Unlike marine shale, the intensity of weathering, which varies with climate and transportation distance, is considered to have significantly impacted both the maceral composition and OM richness in the tide-delta deposited Shanxi Shale. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-04-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Unconventional Resources |
| spelling | doaj-art-fe59b2ae748d4a7b881e31eda4466af32025-02-10T04:34:58ZengKeAi Communications Co., Ltd.Unconventional Resources2666-51902025-04-016100151Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulationQian Chen0Pei Li1Xiaoliang Wei2Changsheng Chen3Wei Dang4Haikuan Nie5Jinchuan Zhang6Petroleum Exploration and Production Research Institute, SINOPEC, Beijing, 102206, ChinaPetroleum Exploration and Production Research Institute, SINOPEC, Beijing, 102206, China; Shale Oil and Gas Enrichment Mechanism and Effective Development of State Key Laboratory, Beijing, 102206, China; Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing, 102206, ChinaExploration and Development Institute of Shengli Oil Field Company, SINOPEC, Dongying, 257000, ChinaPetroleum Exploration and Production Research Institute, SINOPEC, Beijing, 102206, ChinaSchool of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, 710065, ChinaPetroleum Exploration and Production Research Institute, SINOPEC, Beijing, 102206, China; Shale Oil and Gas Enrichment Mechanism and Effective Development of State Key Laboratory, Beijing, 102206, China; Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing, 102206, China; Corresponding author. No. 175 Baisha Road, Changping District, Beijing, 102206, China.School of Energy and Resources, China University of Geosciences, Beijing, 100083, ChinaThe Permian Taiyuan and Shanxi coal-bearing formations are recognized as the primary source rocks and promising shale gas reservoirs in North China. Based on lithologic observations, mineral and major elemental analyses of the Shanxi Sahle in the Southern North China Basin (SNCB), we conducted a preliminary investigation into the depositional environment, climate, and factors controlling the organic matter (OM) accumulation. The main findings are as follows: (1) The Shanxi Formation results from a transition in depositional environment, shifting from tidal flats to delta plains. The Shanxi Shale is primarily composed of clay minerals (34.24 %–75.20 %) and quartz (23.80%–46.39 %), with a notably low carbonate content (<5 %). (2) Illite in the lower sections of the Shanxi Shale is likely sourced from detrital input rather than chemical conversion, while the dissolution of potassium feldspar may account for the elevated kaolinite content. This is further supported by the oxygen level variations between the lower and upper shale intervals. Moreover, no significant positive correlation was observed between SiO2 and Al/Na ratios, nor between clay minerals and total organic carbon (TOC) content. This suggests that the intensity of OM modification prior to diagenesis plays a pivotal role in OM accumulation, aligning with the positive correlation between inertinite proportion and TOC content. (3) Organic matter inputs from fluvial systems were likely influenced by upstream mire conditions, where precursor peat may have accumulated. Unlike marine shale, the intensity of weathering, which varies with climate and transportation distance, is considered to have significantly impacted both the maceral composition and OM richness in the tide-delta deposited Shanxi Shale.http://www.sciencedirect.com/science/article/pii/S2666519025000172Transitional shalePermian Shanxi FormationOrganic matter accumulationDepositional environmentSouthern North China Basin |
| spellingShingle | Qian Chen Pei Li Xiaoliang Wei Changsheng Chen Wei Dang Haikuan Nie Jinchuan Zhang Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation Unconventional Resources Transitional shale Permian Shanxi Formation Organic matter accumulation Depositional environment Southern North China Basin |
| title | Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation |
| title_full | Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation |
| title_fullStr | Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation |
| title_full_unstemmed | Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation |
| title_short | Mineralogy and geochemistry of shale from Shanxi Formation, Southern North China Basin: Implication for organic matter accumulation |
| title_sort | mineralogy and geochemistry of shale from shanxi formation southern north china basin implication for organic matter accumulation |
| topic | Transitional shale Permian Shanxi Formation Organic matter accumulation Depositional environment Southern North China Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2666519025000172 |
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