Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin
There are abundant hydrothermal events within the Dengying Formation dolomite of the Precambrian system in southwest China. Methods including petrography identification, fluid-inclusion observation, in-situ U-Pb dating, and in-situ measurement of rare earth element (REE), etc. are integrated to char...
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KeAi Communications Co., Ltd.
2025-04-01
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| Series: | Energy Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666759224000854 |
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| author | Zhanlei Wang Chan Jiang Changcheng Yang Yuqiang Jiang Yifan Gu |
| author_facet | Zhanlei Wang Chan Jiang Changcheng Yang Yuqiang Jiang Yifan Gu |
| author_sort | Zhanlei Wang |
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| description | There are abundant hydrothermal events within the Dengying Formation dolomite of the Precambrian system in southwest China. Methods including petrography identification, fluid-inclusion observation, in-situ U-Pb dating, and in-situ measurement of rare earth element (REE), etc. are integrated to characterize hydrothermal activity process within the Dengying Formation dolomite. The hydrothermal activity therein can be divided into four stages on the basis of in-situ U-Pb dating results of saddle dolomite cements. The 1st-stage (415.0–400.0 Ma) and 2nd-stage (259.4–248.0 Ma) hydrothermal events are characterized by saddle dolomite filling along the margin of fractures, or filling within dilational breccia and zebra textures. Compared with matrix dolomite and seawater-derived fibrous dolomite, saddle dolomite exhibits obvious negative anomalies of Ce elements. The 3rd-stage (225.6–199.0 Ma) hydrothermal event is represented by galena, sphalerite and other Mississipppi Valley-type (MVT) mineral cements in residual space. The formation of lead-zinc ore is due to the precipitation of metal sulfide caused by the thermo-chemical sulfate reduction (TSR) reaction between hydrothermal fluids and hydrocarbons during the large-scale hydrocarbon charging period. The 4th-stage (130.0–41.0 Ma) hydrothermal event is characterized by quartz and a small amount of fluorite filling the residual pores with dolomites. Quartz and fluorite record the migration of deep high-temperature hydrothermal fluid along early fractures and residual pores. During this period, the hydrothermal fluids result in the heterogeneous structure of bitumen, which is a clear response to high-temperature hydrothermal activity. |
| format | Article |
| id | doaj-art-651a2ce9de224455bcbd3c1f504815ad |
| institution | Kabale University |
| issn | 2666-7592 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Energy Geoscience |
| spelling | doaj-art-651a2ce9de224455bcbd3c1f504815ad2025-01-04T04:57:14ZengKeAi Communications Co., Ltd.Energy Geoscience2666-75922025-04-0162100370Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan BasinZhanlei Wang0Chan Jiang1Changcheng Yang2Yuqiang Jiang3Yifan Gu4School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan, 610500, China; Unconventional Reservoir Evaluation Department, PetroChina Key Laboratory of Unconventional Oil and Gas Resources, Chengdu, Sichuan, 610500, China; Exploration Division, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan, 610041, ChinaExploration Division, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan, 610041, ChinaPetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, 610041, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan, 610500, China; Unconventional Reservoir Evaluation Department, PetroChina Key Laboratory of Unconventional Oil and Gas Resources, Chengdu, Sichuan, 610500, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan, 610500, China; Unconventional Reservoir Evaluation Department, PetroChina Key Laboratory of Unconventional Oil and Gas Resources, Chengdu, Sichuan, 610500, China; Corresponding author. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan, 610500, China.There are abundant hydrothermal events within the Dengying Formation dolomite of the Precambrian system in southwest China. Methods including petrography identification, fluid-inclusion observation, in-situ U-Pb dating, and in-situ measurement of rare earth element (REE), etc. are integrated to characterize hydrothermal activity process within the Dengying Formation dolomite. The hydrothermal activity therein can be divided into four stages on the basis of in-situ U-Pb dating results of saddle dolomite cements. The 1st-stage (415.0–400.0 Ma) and 2nd-stage (259.4–248.0 Ma) hydrothermal events are characterized by saddle dolomite filling along the margin of fractures, or filling within dilational breccia and zebra textures. Compared with matrix dolomite and seawater-derived fibrous dolomite, saddle dolomite exhibits obvious negative anomalies of Ce elements. The 3rd-stage (225.6–199.0 Ma) hydrothermal event is represented by galena, sphalerite and other Mississipppi Valley-type (MVT) mineral cements in residual space. The formation of lead-zinc ore is due to the precipitation of metal sulfide caused by the thermo-chemical sulfate reduction (TSR) reaction between hydrothermal fluids and hydrocarbons during the large-scale hydrocarbon charging period. The 4th-stage (130.0–41.0 Ma) hydrothermal event is characterized by quartz and a small amount of fluorite filling the residual pores with dolomites. Quartz and fluorite record the migration of deep high-temperature hydrothermal fluid along early fractures and residual pores. During this period, the hydrothermal fluids result in the heterogeneous structure of bitumen, which is a clear response to high-temperature hydrothermal activity.http://www.sciencedirect.com/science/article/pii/S2666759224000854Hydrothermal activityHydrocarbon accumulationU-Pb datingDengying FormationPrecambrianSichuan Basin |
| spellingShingle | Zhanlei Wang Chan Jiang Changcheng Yang Yuqiang Jiang Yifan Gu Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin Energy Geoscience Hydrothermal activity Hydrocarbon accumulation U-Pb dating Dengying Formation Precambrian Sichuan Basin |
| title | Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin |
| title_full | Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin |
| title_fullStr | Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin |
| title_full_unstemmed | Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin |
| title_short | Hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the Ediacaran Dengying Formation, Sichuan Basin |
| title_sort | hydrothermal activity and its influence on hydrocarbon accumulation in deep dolomite reservoirs of the ediacaran dengying formation sichuan basin |
| topic | Hydrothermal activity Hydrocarbon accumulation U-Pb dating Dengying Formation Precambrian Sichuan Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2666759224000854 |
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