Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China
The 5th member of the Upper Triassic Xujiahe Formation (T3x5) is one of the important targets for terrigenous natural gas exploration in the Xinchang Gas Field in the Western Sichuan Depression, however, the quality of the T3x5 source rocks is poorly studied and the understanding of it is controvers...
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doaj-845dfc03316c44829deb398b0a12f1d72020-11-24T22:46:13ZengElsevierJournal of Natural Gas Geoscience2468-256X2017-12-012425326210.1016/j.jnggs.2017.12.002Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, ChinaXiaoqi Wu0Yingbin Chen1Guowei Zhao2Xiaowei Du3Huasheng Zeng4Ping Wang5Yanqing Wang6Ye Hu7Wuxi 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, ChinaResearch Institute of Petroleum Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an 710018, 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, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi 214126, ChinaThe 5th member of the Upper Triassic Xujiahe Formation (T3x5) is one of the important targets for terrigenous natural gas exploration in the Xinchang Gas Field in the Western Sichuan Depression, however, the quality of the T3x5 source rocks is poorly studied and the understanding of it is controversial. Studies have been conducted on the development and organic geochemical characteristics of the T3x5 mudstone in the Xinchang Gas Field, and the results indicate that, the T3x5 mudstone in the Xinchang Gas Field display an average thickness of 285.3 m, and the thickness of each submember increases from north to south. The average TOC content, hydrocarbon potential (S1+S2) and chloroform bitumen “A” content of T3x5 mudstone are 2.17%, 2.26 mg/g and 0.264‰, respectively, with the organic abundance mainly reaching the standard of medium source rocks. The kerogen type index (TI) is lower than 0 with the mean δ13C value of −25.0‰, indicating mainly humic and sapropelic-humic types of organic matters. The average vitrinite reflectance (RO) value is 1.17%, indicating the stage after the peak of oil generation. The gas generation intensity of T3x5 mudstone is generally in the range of (3–16) × 108 m3/km2, which suggests the resource basis for the generation of medium-small gas fields. The total amount of natural gas generated by T3x5 mudstone in the Xinchang Gas Field is relatively low, and the generated gas cannot completely displace the water in the formation, therefore, the fullness of gas in the reservoirs is generally low, which causes the simultaneous production of gas and water and the low gas production in the process of production test.http://www.sciencedirect.com/science/article/pii/S2468256X17300627Western Sichuan DepressionXinchang Gas FieldThe 5th member of the Upper Triassic Xujiahe Formation (T3x5)Source rocksOrganic geochemical characteristicsGas generation intensity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiaoqi Wu Yingbin Chen Guowei Zhao Xiaowei Du Huasheng Zeng Ping Wang Yanqing Wang Ye Hu |
spellingShingle |
Xiaoqi Wu Yingbin Chen Guowei Zhao Xiaowei Du Huasheng Zeng Ping Wang Yanqing Wang Ye Hu Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China Journal of Natural Gas Geoscience Western Sichuan Depression Xinchang Gas Field The 5th member of the Upper Triassic Xujiahe Formation (T3x5) Source rocks Organic geochemical characteristics Gas generation intensity |
author_facet |
Xiaoqi Wu Yingbin Chen Guowei Zhao Xiaowei Du Huasheng Zeng Ping Wang Yanqing Wang Ye Hu |
author_sort |
Xiaoqi Wu |
title |
Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China |
title_short |
Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China |
title_full |
Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China |
title_fullStr |
Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China |
title_full_unstemmed |
Evaluation of source rocks in the 5th member of the Upper Triassic Xujiahe Formation in the Xinchang Gas Field, the Western Sichuan Depression, China |
title_sort |
evaluation of source rocks in the 5th member of the upper triassic xujiahe formation in the xinchang gas field, the western sichuan depression, china |
publisher |
Elsevier |
series |
Journal of Natural Gas Geoscience |
issn |
2468-256X |
publishDate |
2017-12-01 |
description |
The 5th member of the Upper Triassic Xujiahe Formation (T3x5) is one of the important targets for terrigenous natural gas exploration in the Xinchang Gas Field in the Western Sichuan Depression, however, the quality of the T3x5 source rocks is poorly studied and the understanding of it is controversial. Studies have been conducted on the development and organic geochemical characteristics of the T3x5 mudstone in the Xinchang Gas Field, and the results indicate that, the T3x5 mudstone in the Xinchang Gas Field display an average thickness of 285.3 m, and the thickness of each submember increases from north to south. The average TOC content, hydrocarbon potential (S1+S2) and chloroform bitumen “A” content of T3x5 mudstone are 2.17%, 2.26 mg/g and 0.264‰, respectively, with the organic abundance mainly reaching the standard of medium source rocks. The kerogen type index (TI) is lower than 0 with the mean δ13C value of −25.0‰, indicating mainly humic and sapropelic-humic types of organic matters. The average vitrinite reflectance (RO) value is 1.17%, indicating the stage after the peak of oil generation. The gas generation intensity of T3x5 mudstone is generally in the range of (3–16) × 108 m3/km2, which suggests the resource basis for the generation of medium-small gas fields. The total amount of natural gas generated by T3x5 mudstone in the Xinchang Gas Field is relatively low, and the generated gas cannot completely displace the water in the formation, therefore, the fullness of gas in the reservoirs is generally low, which causes the simultaneous production of gas and water and the low gas production in the process of production test. |
topic |
Western Sichuan Depression Xinchang Gas Field The 5th member of the Upper Triassic Xujiahe Formation (T3x5) Source rocks Organic geochemical characteristics Gas generation intensity |
url |
http://www.sciencedirect.com/science/article/pii/S2468256X17300627 |
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