Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China
The Ediacaran Dengying Formation in the Sichuan Basin exhibits well-developed microbial mound–shoal complex (MMSC) sedimentation. Its abundant outcrops, core samples, and thin section data provide advantageous conditions for sedimentary architecture studies. Based on these data, this study elucidate...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1429584/full |
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| author | Qinyu Xia Zhenhua Guo Fei Zhang Lin Zhang Rui Xu Xue Wang Wenzheng Li Shuyuan Shi Haijun Yan Yuyang Liu |
| author_facet | Qinyu Xia Zhenhua Guo Fei Zhang Lin Zhang Rui Xu Xue Wang Wenzheng Li Shuyuan Shi Haijun Yan Yuyang Liu |
| author_sort | Qinyu Xia |
| collection | DOAJ |
| description | The Ediacaran Dengying Formation in the Sichuan Basin exhibits well-developed microbial mound–shoal complex (MMSC) sedimentation. Its abundant outcrops, core samples, and thin section data provide advantageous conditions for sedimentary architecture studies. Based on these data, this study elucidates typical lithofacies, identifies sedimentary architectural elements, summarizes MMSC stacking styles, describes sedimentary evolution characteristics, and explores the controlling factors of different stacking styles and the reservoir development conditions of architectural elements. Research indicates that MMSC primarily develops five lithofacies, namely, thrombolitic dolomite, undulate stromatolitic dolomite, laminar stromatolitic dolomite, granular dolomite, and micritic dolomite. MMSC sedimentary architecture is categorized into composite MMSCs, single MMSCs, and lithofacies. Three stacking styles of MMSCs are observed, namely, superimposed MMSCs, which represent aggradational sedimentation; migratory MMSCs, which depict progradational sedimentation; and isolated MMSCs, which denote a single parasequence depositional cycle. The stacking styles of MMSCs are fundamentally controlled by the relationship between MMSC sedimentation rates and variations in accommodation space, with the latter predominantly influenced by fluctuations in sea level. Superimposed MMSC sedimentation rates are comparable to accommodation space change rates, while migratory MMSC sedimentation rates exceed accommodation space change rates, and isolated MMSC sedimentation rates are lower than accommodation space change rates. Various composite MMSCs are isolated from each other by sediments formed under low hydrodynamic conditions, constituting distinct connectivity units. Compared to isolated MMSCs, superimposed and migratory MMSCs exhibit superior reservoir conditions. Within individual MMSCs, different lithofacies lead to high-quality reservoirs in mound cores and flanks due to variations in physical properties, while mound bases, flats, and caps form non-reservoirs. |
| format | Article |
| id | doaj-art-c65768b82a8b4b0fa88ea73abe089529 |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-c65768b82a8b4b0fa88ea73abe0895292025-01-30T06:22:15ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.14295841429584Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, ChinaQinyu Xia0Zhenhua Guo1Fei Zhang2Lin Zhang3Rui Xu4Xue Wang5Wenzheng Li6Shuyuan Shi7Haijun Yan8Yuyang Liu9Research Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaSouthwest Oilfield Company, Petro China, Chengdu, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaSouthwest Oilfield Company, Petro China, Chengdu, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, Petro China, Beijing, ChinaThe Ediacaran Dengying Formation in the Sichuan Basin exhibits well-developed microbial mound–shoal complex (MMSC) sedimentation. Its abundant outcrops, core samples, and thin section data provide advantageous conditions for sedimentary architecture studies. Based on these data, this study elucidates typical lithofacies, identifies sedimentary architectural elements, summarizes MMSC stacking styles, describes sedimentary evolution characteristics, and explores the controlling factors of different stacking styles and the reservoir development conditions of architectural elements. Research indicates that MMSC primarily develops five lithofacies, namely, thrombolitic dolomite, undulate stromatolitic dolomite, laminar stromatolitic dolomite, granular dolomite, and micritic dolomite. MMSC sedimentary architecture is categorized into composite MMSCs, single MMSCs, and lithofacies. Three stacking styles of MMSCs are observed, namely, superimposed MMSCs, which represent aggradational sedimentation; migratory MMSCs, which depict progradational sedimentation; and isolated MMSCs, which denote a single parasequence depositional cycle. The stacking styles of MMSCs are fundamentally controlled by the relationship between MMSC sedimentation rates and variations in accommodation space, with the latter predominantly influenced by fluctuations in sea level. Superimposed MMSC sedimentation rates are comparable to accommodation space change rates, while migratory MMSC sedimentation rates exceed accommodation space change rates, and isolated MMSC sedimentation rates are lower than accommodation space change rates. Various composite MMSCs are isolated from each other by sediments formed under low hydrodynamic conditions, constituting distinct connectivity units. Compared to isolated MMSCs, superimposed and migratory MMSCs exhibit superior reservoir conditions. Within individual MMSCs, different lithofacies lead to high-quality reservoirs in mound cores and flanks due to variations in physical properties, while mound bases, flats, and caps form non-reservoirs.https://www.frontiersin.org/articles/10.3389/feart.2024.1429584/fullmicrobial mound–shoal complexsedimentary architectureEdiacaranDengying formationSichuan basin |
| spellingShingle | Qinyu Xia Zhenhua Guo Fei Zhang Lin Zhang Rui Xu Xue Wang Wenzheng Li Shuyuan Shi Haijun Yan Yuyang Liu Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China Frontiers in Earth Science microbial mound–shoal complex sedimentary architecture Ediacaran Dengying formation Sichuan basin |
| title | Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China |
| title_full | Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China |
| title_fullStr | Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China |
| title_full_unstemmed | Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China |
| title_short | Sedimentary architecture of the microbial mound–shoal complex: a case study of the Ediacaran Dengying Formation, Sichuan Basin, China |
| title_sort | sedimentary architecture of the microbial mound shoal complex a case study of the ediacaran dengying formation sichuan basin china |
| topic | microbial mound–shoal complex sedimentary architecture Ediacaran Dengying formation Sichuan basin |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1429584/full |
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