Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
SINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight...
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KeAi Communications Co., Ltd.
2021-10-01
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| Series: | Journal of Natural Gas Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468256X21000547 |
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| author | Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu |
| author_facet | Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu |
| author_sort | Xiaoqi Wu |
| collection | DOAJ |
| description | SINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight sandstone, few geochemical proofs were presented to support the explanation of the gas source, and regional differences in natural gas have been poorly investigated. The Jurassic tight gas in the Chengdu large gas field has a dryness coefficient (C1/C1-5) of 0.939–0.982, and the δ13C1, δ13C2, and δD1 values range from −33.7‰ to −30.7‰, −25.4‰ to −22.3‰, and −162‰ to −153‰, respectively, with positive carbon and hydrogen isotopic series of gaseous alkanes. The carbon and hydrogen isotopic compositions of the Jurassic tight gas indicate that it is typically coal-derived gas. The measured vitrinite reflectance (RO) values of source rocks of Member 5 of the Xujiahe Formation, which are demonstrated as the main source of Jurassic tight gas, are consistent with the calculated RO values according to the two-stage fractionation model of coal-derived gas. Effective source rocks are rare in the Lower Jurassic Baitianba Formation of the study area, which is considered to have only a minor contribution to the Jurassic gas reservoirs. The geochemical characteristics of Jurassic natural gas from various gas fields in the Western Sichuan Depression vary depending on the effect of different gas sources and accumulation processes. |
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| format | Article |
| id | doaj.art-d92f6a0eeedf4d53a511d450d4cf2b29 |
| institution | Directory Open Access Journal |
| issn | 2468-256X |
| language | English |
| last_indexed | 2024-03-12T09:01:15Z |
| publishDate | 2021-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Natural Gas Geoscience |
| spelling | doaj.art-d92f6a0eeedf4d53a511d450d4cf2b292023-09-02T15:41:05ZengKeAi Communications Co., Ltd.Journal of Natural Gas Geoscience2468-256X2021-10-0165279287Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, ChinaXiaoqi Wu0Yingbin Chen1Yanqing Wang2Huasheng Zeng3Xiaoqiong Jiang4Ye Hu5Research Center of Exploration and Development in Sichuan Basin, Petroleum Exploration and Production Research Institute, SINOPEC, Chengdu, 610041, China; Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, China; Corresponding author. Research Center of Exploration and Development in Sichuan Basin, Petroleum Exploration and Production Research Institute, SINOPEC, Chengdu, 610041, China.Research Center of Exploration and Development in Sichuan Basin, Petroleum Exploration and Production Research Institute, SINOPEC, Chengdu, 610041, China; Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, ChinaResearch Center of Exploration and Development in Sichuan Basin, Petroleum Exploration and Production Research Institute, SINOPEC, Chengdu, 610041, China; Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, 214126, ChinaSINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight sandstone, few geochemical proofs were presented to support the explanation of the gas source, and regional differences in natural gas have been poorly investigated. The Jurassic tight gas in the Chengdu large gas field has a dryness coefficient (C1/C1-5) of 0.939–0.982, and the δ13C1, δ13C2, and δD1 values range from −33.7‰ to −30.7‰, −25.4‰ to −22.3‰, and −162‰ to −153‰, respectively, with positive carbon and hydrogen isotopic series of gaseous alkanes. The carbon and hydrogen isotopic compositions of the Jurassic tight gas indicate that it is typically coal-derived gas. The measured vitrinite reflectance (RO) values of source rocks of Member 5 of the Xujiahe Formation, which are demonstrated as the main source of Jurassic tight gas, are consistent with the calculated RO values according to the two-stage fractionation model of coal-derived gas. Effective source rocks are rare in the Lower Jurassic Baitianba Formation of the study area, which is considered to have only a minor contribution to the Jurassic gas reservoirs. The geochemical characteristics of Jurassic natural gas from various gas fields in the Western Sichuan Depression vary depending on the effect of different gas sources and accumulation processes.http://www.sciencedirect.com/science/article/pii/S2468256X21000547Western Sichuan DepressionChengdu gas fieldTight sandstone gasGeochemical characteristicsThermal maturity |
| spellingShingle | Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China Journal of Natural Gas Geoscience Western Sichuan Depression Chengdu gas field Tight sandstone gas Geochemical characteristics Thermal maturity |
| title | Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China |
| title_full | Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China |
| title_fullStr | Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China |
| title_full_unstemmed | Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China |
| title_short | Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China |
| title_sort | geochemical characteristics of natural gas in tight sandstone of the chengdu large gas field western sichuan depression sichuan basin china |
| topic | Western Sichuan Depression Chengdu gas field Tight sandstone gas Geochemical characteristics Thermal maturity |
| url | http://www.sciencedirect.com/science/article/pii/S2468256X21000547 |
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