Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin
In order to provide basis for further exploration and deployment of volcanic gas reservoirs in the Sichuan Basin, we classified Permian volcanic rocks in this basin using drilling, mud logging, assay, logging and seismic data comprehensively. Then, the lithological characteristics, lithofacies chara...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2019-10-01
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| Series: | Natural Gas Industry B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854019300890 |
| _version_ | 1827263869510221824 |
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| author | Long Wen Ya Li Haiyong Yi Xin Liu Benjian Zhang Yuchao Qiu Gang Zhou Xihua Zhang |
| author_facet | Long Wen Ya Li Haiyong Yi Xin Liu Benjian Zhang Yuchao Qiu Gang Zhou Xihua Zhang |
| author_sort | Long Wen |
| collection | DOAJ |
| description | In order to provide basis for further exploration and deployment of volcanic gas reservoirs in the Sichuan Basin, we classified Permian volcanic rocks in this basin using drilling, mud logging, assay, logging and seismic data comprehensively. Then, the lithological characteristics, lithofacies characteristics, lithofacies distribution and reservoir characteristics of different types of volcanic rocks were studied. Besides, the main factors controlling the development of volcanic reservoirs were determined. And the following research results were obtained. First, volcanic rocks in the Sichuan Basin can be comprehensively classified into 4 categories (i.e., volcanic lava, volcaniclastic lava, volcaniclastic rocks and sedimentary volcaniclastic rocks), and basalt, breccia lava, tuffaceous breccia lava, tuff, sedimentary tuff are mainly developed. Second, 3 types of volcanic lithofacies are extensively developed in the Sichuan Basin, including overflow facies, effusive facies and volcanic sedimentary facies. Overflow facies is mainly dominated by basalt, effusive facies is mainly composed of volcaniclastic lava, and volcanic sedimentary facies is mainly composed of tuff and sedimentary tuff. Third, volcanic reservoirs are lithologically composed of breccia lava and basalt. Breccia lava reservoirs are pore-type reservoirs of moderate porosity and low permeability with devitrified micropores and dissolution pores as main reservoir space. In basalt, fractures and dissolution pores are mainly developed, and they are porous-fractured reservoirs with lower matrix porosity. Fourth, the factors controlling volcanic reservoirs mainly include lithology, lithofacies, later fluid alteration and tectonism. Volcaniclastic lava is devitrified in the process of rapid condensation, and a great number of dispersion-shape micropores are formed to provide favorable conditions for further dissolution and pore enhancement in the later stage. Post-diagenesis effect (e.g. dissolution) and fracture development make the reservoir properties better. In conclusion, the areal distribution of volcanic reservoirs in the Sichuan Basin is mainly controlled by the lithofacies. Porous-fractured basalt reservoirs are mainly developed in the Ya'an–Leshan–Pingshan area in the southwestern Sichuan Basin, and pore-type volcaniclastic lava reservoirs are mainly developed in the Chengdu–Jianyang–Santai area. Keywords: Sichuan basin, Permian, Volcanic rock, Classification, Lithology, Lithofacies, Reservoir characteristic, Later fluid alteration, Tectonism |
| first_indexed | 2024-03-07T17:35:48Z |
| format | Article |
| id | doaj.art-30bacb3da7a441df8b190105b2f43c61 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2025-03-22T03:37:01Z |
| publishDate | 2019-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-30bacb3da7a441df8b190105b2f43c612024-04-28T12:09:41ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402019-10-0165452462Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan BasinLong Wen0Ya Li1Haiyong Yi2Xin Liu3Benjian Zhang4Yuchao Qiu5Gang Zhou6Xihua Zhang7Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China; Corresponding author.PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, ChinaNorthwest Sichuan Division, PetroChina Southwest Oil & Gasfield Company, Jiangyou, Sichuan 621741, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, ChinaIn order to provide basis for further exploration and deployment of volcanic gas reservoirs in the Sichuan Basin, we classified Permian volcanic rocks in this basin using drilling, mud logging, assay, logging and seismic data comprehensively. Then, the lithological characteristics, lithofacies characteristics, lithofacies distribution and reservoir characteristics of different types of volcanic rocks were studied. Besides, the main factors controlling the development of volcanic reservoirs were determined. And the following research results were obtained. First, volcanic rocks in the Sichuan Basin can be comprehensively classified into 4 categories (i.e., volcanic lava, volcaniclastic lava, volcaniclastic rocks and sedimentary volcaniclastic rocks), and basalt, breccia lava, tuffaceous breccia lava, tuff, sedimentary tuff are mainly developed. Second, 3 types of volcanic lithofacies are extensively developed in the Sichuan Basin, including overflow facies, effusive facies and volcanic sedimentary facies. Overflow facies is mainly dominated by basalt, effusive facies is mainly composed of volcaniclastic lava, and volcanic sedimentary facies is mainly composed of tuff and sedimentary tuff. Third, volcanic reservoirs are lithologically composed of breccia lava and basalt. Breccia lava reservoirs are pore-type reservoirs of moderate porosity and low permeability with devitrified micropores and dissolution pores as main reservoir space. In basalt, fractures and dissolution pores are mainly developed, and they are porous-fractured reservoirs with lower matrix porosity. Fourth, the factors controlling volcanic reservoirs mainly include lithology, lithofacies, later fluid alteration and tectonism. Volcaniclastic lava is devitrified in the process of rapid condensation, and a great number of dispersion-shape micropores are formed to provide favorable conditions for further dissolution and pore enhancement in the later stage. Post-diagenesis effect (e.g. dissolution) and fracture development make the reservoir properties better. In conclusion, the areal distribution of volcanic reservoirs in the Sichuan Basin is mainly controlled by the lithofacies. Porous-fractured basalt reservoirs are mainly developed in the Ya'an–Leshan–Pingshan area in the southwestern Sichuan Basin, and pore-type volcaniclastic lava reservoirs are mainly developed in the Chengdu–Jianyang–Santai area. Keywords: Sichuan basin, Permian, Volcanic rock, Classification, Lithology, Lithofacies, Reservoir characteristic, Later fluid alteration, Tectonismhttp://www.sciencedirect.com/science/article/pii/S2352854019300890 |
| spellingShingle | Long Wen Ya Li Haiyong Yi Xin Liu Benjian Zhang Yuchao Qiu Gang Zhou Xihua Zhang Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin Natural Gas Industry B |
| title | Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin |
| title_full | Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin |
| title_fullStr | Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin |
| title_full_unstemmed | Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin |
| title_short | Lithofacies and reservoir characteristics of Permian volcanic rocks in the Sichuan Basin |
| title_sort | lithofacies and reservoir characteristics of permian volcanic rocks in the sichuan basin |
| url | http://www.sciencedirect.com/science/article/pii/S2352854019300890 |
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