Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China
The marine shale in southern China has undergone complex tectonic evolution with a high thermal evolution degree. Excessive thermal evolution brings certain risks to shale gas exploration and development. With the advancement of experimental methods, the evolution process of shale reservoirs can be...
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| Format: | Article |
| Language: | English |
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De Gruyter
2020-12-01
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| Series: | Open Geosciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/geo-2020-0216 |
| _version_ | 1819101808268673024 |
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| author | Zhang Kun Peng Jun Wang Xin Jiang Zhenxue Song Yan Jiang Lin Jiang Shu Xue Zixin Wen Ming Li Xiaohui Liu Xiaoxue Huang Yizhou Wang Pengfei Shan Chang’an Liu Tianlin Xie Xuelian |
| author_facet | Zhang Kun Peng Jun Wang Xin Jiang Zhenxue Song Yan Jiang Lin Jiang Shu Xue Zixin Wen Ming Li Xiaohui Liu Xiaoxue Huang Yizhou Wang Pengfei Shan Chang’an Liu Tianlin Xie Xuelian |
| author_sort | Zhang Kun |
| collection | DOAJ |
| description | The marine shale in southern China has undergone complex tectonic evolution with a high thermal evolution degree. Excessive thermal evolution brings certain risks to shale gas exploration and development. With the advancement of experimental methods, the evolution process of shale reservoirs can be better understood from the micro-nanoscale. This work takes the Ordovician-Silurian Wufeng and the first member of Longmaxi Formation in the Sichuan Basin and Lower Cambrian Niutitang Formation in Outer Margin of the Sichuan Basin to study the impact of maturity upon the genesis of shale gas and development features of the reservoir. A series of geochemical research methods, including TOC, gas component and gas isotope, were adopted to study the impact of different thermal evolution stages of organic matter upon the genesis of shale gas. The nanoscale micro-imaging technique, such as FIB-SEM and FIB-HIM, was used to analyze the development of OM-hosted pores. As shown from the results, when Ro = 1.2–3.5%, the marine shale gas is dominated by methane and other hydrocarbon gases, since the mixture of cracking gas from liquid hydrocarbons and kerogen-cracking gas cause the carbon isotope reversal. Besides, the pyrobitumen pores characterized by the strong connectivity and storage capacity were primarily developed. When Ro > 3.5%, the organic matter is at the graphitization stage. The shale gas is mainly composed of nitrogen at this stage. The nitrogen is originated from the atmosphere and the thermal evolution process, and the OM-hosted pores (pyrobitumen and kerogen pores) characterized by the bad connectivity and storage capacity are developed. Finally, the main component of shale gas, the genesis of shale gas and the pattern of OM-hosted pores under different thermal evolution stages of organic matter are summarized, which provide technical support for the exploration and development of shale gas. |
| first_indexed | 2024-12-22T01:24:33Z |
| format | Article |
| id | doaj.art-3673fdbb0d6c4ab8a9ec6a5b069a8b19 |
| institution | Directory Open Access Journal |
| issn | 2391-5447 |
| language | English |
| last_indexed | 2024-12-22T01:24:33Z |
| publishDate | 2020-12-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Geosciences |
| spelling | doaj.art-3673fdbb0d6c4ab8a9ec6a5b069a8b192022-12-21T18:43:39ZengDe GruyterOpen Geosciences2391-54472020-12-011211617162910.1515/geo-2020-0216geo-2020-0216Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South ChinaZhang Kun0Peng Jun1Wang Xin2Jiang Zhenxue3Song Yan4Jiang Lin5Jiang Shu6Xue Zixin7Wen Ming8Li Xiaohui9Liu Xiaoxue10Huang Yizhou11Wang Pengfei12Shan Chang’an13Liu Tianlin14Xie Xuelian15School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaResearch Institute of Petroleum Exploration and Development, Beijing 100083, ChinaKey Laboratory of Tectonics and Petroleum Resources of Ministry of Education, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaOrganic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UKGeoscience Documentation Center, China Geological Survey, Beijing 100083, ChinaSchool of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaGuangzhou Marine Geological survey, Guangzhou 510760, ChinaThe marine shale in southern China has undergone complex tectonic evolution with a high thermal evolution degree. Excessive thermal evolution brings certain risks to shale gas exploration and development. With the advancement of experimental methods, the evolution process of shale reservoirs can be better understood from the micro-nanoscale. This work takes the Ordovician-Silurian Wufeng and the first member of Longmaxi Formation in the Sichuan Basin and Lower Cambrian Niutitang Formation in Outer Margin of the Sichuan Basin to study the impact of maturity upon the genesis of shale gas and development features of the reservoir. A series of geochemical research methods, including TOC, gas component and gas isotope, were adopted to study the impact of different thermal evolution stages of organic matter upon the genesis of shale gas. The nanoscale micro-imaging technique, such as FIB-SEM and FIB-HIM, was used to analyze the development of OM-hosted pores. As shown from the results, when Ro = 1.2–3.5%, the marine shale gas is dominated by methane and other hydrocarbon gases, since the mixture of cracking gas from liquid hydrocarbons and kerogen-cracking gas cause the carbon isotope reversal. Besides, the pyrobitumen pores characterized by the strong connectivity and storage capacity were primarily developed. When Ro > 3.5%, the organic matter is at the graphitization stage. The shale gas is mainly composed of nitrogen at this stage. The nitrogen is originated from the atmosphere and the thermal evolution process, and the OM-hosted pores (pyrobitumen and kerogen pores) characterized by the bad connectivity and storage capacity are developed. Finally, the main component of shale gas, the genesis of shale gas and the pattern of OM-hosted pores under different thermal evolution stages of organic matter are summarized, which provide technical support for the exploration and development of shale gas.https://doi.org/10.1515/geo-2020-0216organic matter porescarbon isotope reversalsource of nitrogenkerogen-cracking gasshale gas |
| spellingShingle | Zhang Kun Peng Jun Wang Xin Jiang Zhenxue Song Yan Jiang Lin Jiang Shu Xue Zixin Wen Ming Li Xiaohui Liu Xiaoxue Huang Yizhou Wang Pengfei Shan Chang’an Liu Tianlin Xie Xuelian Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China Open Geosciences organic matter pores carbon isotope reversal source of nitrogen kerogen-cracking gas shale gas |
| title | Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China |
| title_full | Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China |
| title_fullStr | Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China |
| title_full_unstemmed | Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China |
| title_short | Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China |
| title_sort | effect of organic maturity on shale gas genesis and pores development a case study on marine shale in the upper yangtze region south china |
| topic | organic matter pores carbon isotope reversal source of nitrogen kerogen-cracking gas shale gas |
| url | https://doi.org/10.1515/geo-2020-0216 |
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