Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China
To analyze the episodic alteration of Middle Permian carbonate reservoirs by complex hydrothermal fluid in southwestern Sichuan Basin, petrology, geochemistry, fluid inclusion and U-Pb dating researches are conducted. The fractures and vugs of Middle Permian Qixia–Maokou formations are filled with m...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2024-02-01
|
| Series: | Petroleum Exploration and Development |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380424600078 |
| _version_ | 1827347942323781632 |
|---|---|
| author | Mingyou FENG Junxin SHANG Anjiang SHEN Long WEN Xingzhi WANG Liang XU Feng LIANG Xiaohong LIU |
| author_facet | Mingyou FENG Junxin SHANG Anjiang SHEN Long WEN Xingzhi WANG Liang XU Feng LIANG Xiaohong LIU |
| author_sort | Mingyou FENG |
| collection | DOAJ |
| description | To analyze the episodic alteration of Middle Permian carbonate reservoirs by complex hydrothermal fluid in southwestern Sichuan Basin, petrology, geochemistry, fluid inclusion and U-Pb dating researches are conducted. The fractures and vugs of Middle Permian Qixia–Maokou formations are filled with multi-stage medium−coarse saddle dolomites and associated hydrothermal minerals, which indicates that the early limestone/dolomite episodic alteration was caused by the large-scale, high-temperature, deep magnesium-rich brine along flowing channels such as basement faults or associated fractures under the tectonic compression and napping during the Indosinian. The time of magnesium-rich hydrothermal activity was from the Middle Triassic to the Late Triassic. The siliceous and calcite fillings were triggered by hydrothermal alteration in the Middle and Late Yanshanian Movement and Himalayan Movement. Hydrothermal dolomitization is controlled by fault, hydrothermal property, flowing channel and surrounding rock lithology, which occur as equilibrium effect of porosity and permeability. The thick massive grainstone/dolomites were mainly altered by modification such as hydrothermal dolomitization/recrystallization, brecciation and fracture-vugs filling. Early thin–medium packstones were mainly altered by dissolution and infilling of fracturing, bedding dolomitization, dissolution and associated mineral fillings. The dissolved vugs and fractures are the main reservoir space under hydrothermal conditions, and the connection of dissolved vugs and network fractures is favorable for forming high-quality dolomite reservoir. Hydrothermal dolomite reservoirs are developed within a range of 1 km near faults, with a thickness of 30–60 m. Hydrothermal dolomite reservoirs with local connected pore/vugs and fractures have exploration potential. |
| first_indexed | 2024-03-08T00:01:19Z |
| format | Article |
| id | doaj.art-f79a53c2c4f145c9965f4ab0beaabe3f |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-03-08T00:01:19Z |
| publishDate | 2024-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-f79a53c2c4f145c9965f4ab0beaabe3f2024-02-18T04:39:33ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042024-02-015118196Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW ChinaMingyou FENG0Junxin SHANG1Anjiang SHEN2Long WEN3Xingzhi WANG4Liang XU5Feng LIANG6Xiaohong LIU7School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; Corresponding authorSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, ChinaPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, ChinaResearch Institute of Exploration and Development, PetroChina Southwest Oil & Gas filed Company, Chengdu 610041, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, ChinaResearch Institute of Exploration and Development, PetroChina Southwest Oil & Gas filed Company, Chengdu 610041, ChinaPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, ChinaTo analyze the episodic alteration of Middle Permian carbonate reservoirs by complex hydrothermal fluid in southwestern Sichuan Basin, petrology, geochemistry, fluid inclusion and U-Pb dating researches are conducted. The fractures and vugs of Middle Permian Qixia–Maokou formations are filled with multi-stage medium−coarse saddle dolomites and associated hydrothermal minerals, which indicates that the early limestone/dolomite episodic alteration was caused by the large-scale, high-temperature, deep magnesium-rich brine along flowing channels such as basement faults or associated fractures under the tectonic compression and napping during the Indosinian. The time of magnesium-rich hydrothermal activity was from the Middle Triassic to the Late Triassic. The siliceous and calcite fillings were triggered by hydrothermal alteration in the Middle and Late Yanshanian Movement and Himalayan Movement. Hydrothermal dolomitization is controlled by fault, hydrothermal property, flowing channel and surrounding rock lithology, which occur as equilibrium effect of porosity and permeability. The thick massive grainstone/dolomites were mainly altered by modification such as hydrothermal dolomitization/recrystallization, brecciation and fracture-vugs filling. Early thin–medium packstones were mainly altered by dissolution and infilling of fracturing, bedding dolomitization, dissolution and associated mineral fillings. The dissolved vugs and fractures are the main reservoir space under hydrothermal conditions, and the connection of dissolved vugs and network fractures is favorable for forming high-quality dolomite reservoir. Hydrothermal dolomite reservoirs are developed within a range of 1 km near faults, with a thickness of 30–60 m. Hydrothermal dolomite reservoirs with local connected pore/vugs and fractures have exploration potential.http://www.sciencedirect.com/science/article/pii/S1876380424600078Sichuan BasinPermianMiddle Permian Qixia FormationMiddle Permian Maokou Formationhydrothermal fluidhydrothermal dissolution |
| spellingShingle | Mingyou FENG Junxin SHANG Anjiang SHEN Long WEN Xingzhi WANG Liang XU Feng LIANG Xiaohong LIU Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China Petroleum Exploration and Development Sichuan Basin Permian Middle Permian Qixia Formation Middle Permian Maokou Formation hydrothermal fluid hydrothermal dissolution |
| title | Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China |
| title_full | Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China |
| title_fullStr | Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China |
| title_full_unstemmed | Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China |
| title_short | Episodic hydrothermal alteration on Middle Permian carbonate reservoirs and its geological significance in southwestern Sichuan Basin, SW China |
| title_sort | episodic hydrothermal alteration on middle permian carbonate reservoirs and its geological significance in southwestern sichuan basin sw china |
| topic | Sichuan Basin Permian Middle Permian Qixia Formation Middle Permian Maokou Formation hydrothermal fluid hydrothermal dissolution |
| url | http://www.sciencedirect.com/science/article/pii/S1876380424600078 |
| work_keys_str_mv | AT mingyoufeng episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT junxinshang episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT anjiangshen episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT longwen episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT xingzhiwang episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT liangxu episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT fengliang episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina AT xiaohongliu episodichydrothermalalterationonmiddlepermiancarbonatereservoirsanditsgeologicalsignificanceinsouthwesternsichuanbasinswchina |