Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area
Through analyzing the gas composition and isotopes of carbon and hydrogen of the shale gas samples, the geochemical characteristics of the upper Triassic Yanchang Formation shale from the Yanchang exploration area in the southeastern Ordos basin were studied.The genesis and source of the Yanchang Fo...
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2017-04-01
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| Series: | 矿业科学学报 |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/article/id/53 |
| _version_ | 1828294379353145344 |
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| author | Xu Hongwei Li Xianqing Zhou Baogang Yang Jie Zhang Wei Wang Zhe Gao Wenjie |
| author_facet | Xu Hongwei Li Xianqing Zhou Baogang Yang Jie Zhang Wei Wang Zhe Gao Wenjie |
| author_sort | Xu Hongwei |
| collection | DOAJ |
| description | Through analyzing the gas composition and isotopes of carbon and hydrogen of the shale gas samples, the geochemical characteristics of the upper Triassic Yanchang Formation shale from the Yanchang exploration area in the southeastern Ordos basin were studied.The genesis and source of the Yanchang Formation shale gas in the Yanchang exploration area were also discussed.The results show that:①Shale gas of Yanchang Formation in the Yanchang exploration area mainly consist of hydrocarbon gases (87.89%~99.66%), with methane content less than 95% (60.44%~91.68%), high content of heavy hydrocarbon component, relatively lower dry coefficient(64.00%~93.43%), and low non-hydrocarbon gases content (mainly N<sub>2</sub> and CO<sub>2</sub>, 0.68% and 1.36%, respectively), belongs to typical wet gas.②The carbon isotope values of methane, ethane, propane and butane of Yanchang Formation shale gas in the Yanchang exploration area are mainly distributed in -53.4‰~-46.3 ‰, -39.7 ‰~-31.9 ‰, -34.3 ‰~-29.6 ‰ and -33.8 ‰~-25.0 ‰.The carbon isotope of Yanchang Formation shale gas in the Yanchang exploration area is mainly characterized by <i>δ</i><sup>13</sup>C<sub>1</sub>< <i>δ</i><sup>13</sup>C<sub>2</sub> < <i>δ</i><sup>13</sup>C<sub>3</sub> < <i>δ</i><sup>13</sup>C<sub>4</sub>.Only a small number of samples of the <i>δ</i><sup>13</sup>C<sub>3</sub> and δ<sup>13</sup>C<sub>4</sub> are reversal.③Shale gas of Yanchang Formation in the Yanchang exploration area is dominated by thermogenic gas, mainly oil type gas formed by kerogen cracking that from the low-mature and mature stage of the partial sapropel type shale. |
| first_indexed | 2024-04-13T11:36:28Z |
| format | Article |
| id | doaj.art-abc2e2abf28645fb9cc7798551970654 |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-04-13T11:36:28Z |
| publishDate | 2017-04-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-abc2e2abf28645fb9cc77985519706542022-12-22T02:48:26ZengEmergency Management Press矿业科学学报2096-21932017-04-012299108Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration areaXu Hongwei0Li Xianqing1Zhou Baogang2Yang Jie3Zhang Wei4Wang Zhe5Gao Wenjie6State Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaState Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, ChinaThrough analyzing the gas composition and isotopes of carbon and hydrogen of the shale gas samples, the geochemical characteristics of the upper Triassic Yanchang Formation shale from the Yanchang exploration area in the southeastern Ordos basin were studied.The genesis and source of the Yanchang Formation shale gas in the Yanchang exploration area were also discussed.The results show that:①Shale gas of Yanchang Formation in the Yanchang exploration area mainly consist of hydrocarbon gases (87.89%~99.66%), with methane content less than 95% (60.44%~91.68%), high content of heavy hydrocarbon component, relatively lower dry coefficient(64.00%~93.43%), and low non-hydrocarbon gases content (mainly N<sub>2</sub> and CO<sub>2</sub>, 0.68% and 1.36%, respectively), belongs to typical wet gas.②The carbon isotope values of methane, ethane, propane and butane of Yanchang Formation shale gas in the Yanchang exploration area are mainly distributed in -53.4‰~-46.3 ‰, -39.7 ‰~-31.9 ‰, -34.3 ‰~-29.6 ‰ and -33.8 ‰~-25.0 ‰.The carbon isotope of Yanchang Formation shale gas in the Yanchang exploration area is mainly characterized by <i>δ</i><sup>13</sup>C<sub>1</sub>< <i>δ</i><sup>13</sup>C<sub>2</sub> < <i>δ</i><sup>13</sup>C<sub>3</sub> < <i>δ</i><sup>13</sup>C<sub>4</sub>.Only a small number of samples of the <i>δ</i><sup>13</sup>C<sub>3</sub> and δ<sup>13</sup>C<sub>4</sub> are reversal.③Shale gas of Yanchang Formation in the Yanchang exploration area is dominated by thermogenic gas, mainly oil type gas formed by kerogen cracking that from the low-mature and mature stage of the partial sapropel type shale.http://kykxxb.cumtb.edu.cn/article/id/53terrestrial shale gasgeochemical characteriticcarbon and hydrogen isotopesyanchang formationthe yanchang exploration area |
| spellingShingle | Xu Hongwei Li Xianqing Zhou Baogang Yang Jie Zhang Wei Wang Zhe Gao Wenjie Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area 矿业科学学报 terrestrial shale gas geochemical characteritic carbon and hydrogen isotopes yanchang formation the yanchang exploration area |
| title | Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area |
| title_full | Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area |
| title_fullStr | Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area |
| title_full_unstemmed | Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area |
| title_short | Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area |
| title_sort | geochemical characteristics and genesis of the yanchang formation terrestrial shale gas in the yanchang exploration area |
| topic | terrestrial shale gas geochemical characteritic carbon and hydrogen isotopes yanchang formation the yanchang exploration area |
| url | http://kykxxb.cumtb.edu.cn/article/id/53 |
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