Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China
Data was acquired from both the drillings and core samples of the Lower Paleozoic Qiongzhusi and Longmaxi Formations' marine shale gas reservoirs in the southern Sichuan Basin by means of numerous specific experimental methods such as organic geochemistry, organic petrology, and pore analyses....
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2016-06-01
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| Series: | Journal of Natural Gas Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468256X16300293 |
| _version_ | 1797713821071048704 |
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| author | Xianqing Li Yuan Wang Jizhen Zhang Man Guo Pei Zhao Hongwei Xu Jie Yang Feiyu Wang |
| author_facet | Xianqing Li Yuan Wang Jizhen Zhang Man Guo Pei Zhao Hongwei Xu Jie Yang Feiyu Wang |
| author_sort | Xianqing Li |
| collection | DOAJ |
| description | Data was acquired from both the drillings and core samples of the Lower Paleozoic Qiongzhusi and Longmaxi Formations' marine shale gas reservoirs in the southern Sichuan Basin by means of numerous specific experimental methods such as organic geochemistry, organic petrology, and pore analyses. Findings helped determine the characteristics of organic matter, total porosity, microscopic pore, and pore structure. The results show that the Lower Paleozoic marine shale in the south of the Sichuan Basin are characterized by high total organic carbon content (most TOC>2.0%), high thermal maturity level (RO = 2.3%–3.8%), and low total porosity (1.16%–6.87%). The total organic carbon content and thermal maturity level of the Qiongzhusi Formation shale are higher than those of the Longmaxi Formation shale, while the total porosity of the Qiongzhusi Formation shale is lower than that of the Longmaxi Formation shale. There exists intergranular pore, dissolved pore, crystal particle pore, particle edge pore, and organic matter pore in the Lower Paleozoic Qiongzhusi Formation and Longmaxi Formation shale. There are more micro-nano pores developed in the Longmaxi Formation shales than those in the Qiongzhusi Formation shales. Intergranular pores, dissolved pores, as well as organic matter pores, are the most abundant, these are primary storage spaces for shale gas. The microscopic pores in the Lower Paleozoic shales are mainly composed of micropores, mesopores, and a small amount of macropores. The micropore and mesopore in the Qiongzhusi Formation shale account for 83.92% of the total pore volume. The micropore and mesopore in the Longmaxi Formation shale accounts for 78.17% of the total pore volume. Thus, the micropores and mesopores are the chief components of microscopic pores in the Lower Paleozoic shale gas reservoirs in the southern Sichuan Basin. |
| first_indexed | 2024-03-12T07:42:31Z |
| format | Article |
| id | doaj.art-616a2660309e476cb7039e06f677d069 |
| institution | Directory Open Access Journal |
| issn | 2468-256X |
| language | English |
| last_indexed | 2024-03-12T07:42:31Z |
| publishDate | 2016-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Natural Gas Geoscience |
| spelling | doaj.art-616a2660309e476cb7039e06f677d0692023-09-02T21:11:26ZengKeAi Communications Co., Ltd.Journal of Natural Gas Geoscience2468-256X2016-06-011319520210.1016/j.jnggs.2016.07.002Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, ChinaXianqing Li0Yuan Wang1Jizhen Zhang2Man Guo3Pei Zhao4Hongwei Xu5Jie Yang6Feiyu Wang7State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, ChinaData was acquired from both the drillings and core samples of the Lower Paleozoic Qiongzhusi and Longmaxi Formations' marine shale gas reservoirs in the southern Sichuan Basin by means of numerous specific experimental methods such as organic geochemistry, organic petrology, and pore analyses. Findings helped determine the characteristics of organic matter, total porosity, microscopic pore, and pore structure. The results show that the Lower Paleozoic marine shale in the south of the Sichuan Basin are characterized by high total organic carbon content (most TOC>2.0%), high thermal maturity level (RO = 2.3%–3.8%), and low total porosity (1.16%–6.87%). The total organic carbon content and thermal maturity level of the Qiongzhusi Formation shale are higher than those of the Longmaxi Formation shale, while the total porosity of the Qiongzhusi Formation shale is lower than that of the Longmaxi Formation shale. There exists intergranular pore, dissolved pore, crystal particle pore, particle edge pore, and organic matter pore in the Lower Paleozoic Qiongzhusi Formation and Longmaxi Formation shale. There are more micro-nano pores developed in the Longmaxi Formation shales than those in the Qiongzhusi Formation shales. Intergranular pores, dissolved pores, as well as organic matter pores, are the most abundant, these are primary storage spaces for shale gas. The microscopic pores in the Lower Paleozoic shales are mainly composed of micropores, mesopores, and a small amount of macropores. The micropore and mesopore in the Qiongzhusi Formation shale account for 83.92% of the total pore volume. The micropore and mesopore in the Longmaxi Formation shale accounts for 78.17% of the total pore volume. Thus, the micropores and mesopores are the chief components of microscopic pores in the Lower Paleozoic shale gas reservoirs in the southern Sichuan Basin.http://www.sciencedirect.com/science/article/pii/S2468256X16300293Pore characteristicsShale gas reservoirThe Lower PaleozoicMarine shaleThe southern Sichuan Basin |
| spellingShingle | Xianqing Li Yuan Wang Jizhen Zhang Man Guo Pei Zhao Hongwei Xu Jie Yang Feiyu Wang Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China Journal of Natural Gas Geoscience Pore characteristics Shale gas reservoir The Lower Paleozoic Marine shale The southern Sichuan Basin |
| title | Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China |
| title_full | Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China |
| title_fullStr | Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China |
| title_full_unstemmed | Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China |
| title_short | Pore characteristics of shale gas reservoirs from the Lower Paleozoic in the southern Sichuan Basin, China |
| title_sort | pore characteristics of shale gas reservoirs from the lower paleozoic in the southern sichuan basin china |
| topic | Pore characteristics Shale gas reservoir The Lower Paleozoic Marine shale The southern Sichuan Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2468256X16300293 |
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