The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China
Coal and organic-rich shale in the Yan’an Formation in the southwestern margin of the Ordos Basin are widely developed, which is an important fact for oil and gas exploration in China that has been widely explored for a long time. In this paper, detailed sequence division and sedimentary environment...
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MDPI AG
2022-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/14/5310 |
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| author | Lianfu Hai Caixia Mu Qinghai Xu Yongliang Sun Hongrui Fan Xiangyang Xie Xiangcheng Wei Chao Mei Haibin Yu Walter Manger Jun Yang |
| author_facet | Lianfu Hai Caixia Mu Qinghai Xu Yongliang Sun Hongrui Fan Xiangyang Xie Xiangcheng Wei Chao Mei Haibin Yu Walter Manger Jun Yang |
| author_sort | Lianfu Hai |
| collection | DOAJ |
| description | Coal and organic-rich shale in the Yan’an Formation in the southwestern margin of the Ordos Basin are widely developed, which is an important fact for oil and gas exploration in China that has been widely explored for a long time. In this paper, detailed sequence division and sedimentary environment analyses of the Yan’an Formation in the Pengyang area on the southwestern margin of the Ordos Basin were conducted using field outcrops, drilling cores, logging, wavelet transform and organic geochemistry. The results showed that the succession consists of some units with distinctly different characteristics. Based on the petrographic assemblage and transform wavelet characteristics, the Yan’an Formation in this area can be divided into a long-term cycle, five medium-term cycles, and eleven short-term cycles, among which coal and carbonaceous shale were mainly developed in the short-term cycles I<sub>2</sub>, III<sub>1</sub>, III<sub>2</sub>, V<sub>1</sub> and V<sub>2</sub>. Coal and organic-rich mud shale have been developed in the Yan’an Formation and plant debris in mudstone and coal is common, indicating the development of swamps and shallow water-covered depressions in this area. The sandstones showed parallel bedding, cross-bedding and scours, thus indicating fluvial deposits. The saturated hydrocarbon gas chromatographic parameters of mud shale showed that the pristane/phytane (Pr/Ph) ratio is 2.24–6.22, the Ph/nC18 ratio is 0.15–0.93, and the Pr/nC17 ratio is 0.97–2.78, supporting the finding that the organic matter has mainly originated from terrestrial sources. |
| first_indexed | 2024-03-09T03:26:46Z |
| format | Article |
| id | doaj.art-c9ed4bc6b5ac447ab271869dc0e65913 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T03:26:46Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-c9ed4bc6b5ac447ab271869dc0e659132023-12-03T15:01:14ZengMDPI AGEnergies1996-10732022-07-011514531010.3390/en15145310The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, ChinaLianfu Hai0Caixia Mu1Qinghai Xu2Yongliang Sun3Hongrui Fan4Xiangyang Xie5Xiangcheng Wei6Chao Mei7Haibin Yu8Walter Manger9Jun Yang10Mineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaMineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaSchool of Geosciences, Yangtze University, Wuhan 430100, ChinaMineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Geology, Energy, and Environment, Texas Christian University, Fort Worth, TX 76129, USAMineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaMineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaMineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, ChinaDepartment of Geosciences, University of Arkansas, Fayetteville, AR 72701, USASchool of Geosciences, Yangtze University, Wuhan 430100, ChinaCoal and organic-rich shale in the Yan’an Formation in the southwestern margin of the Ordos Basin are widely developed, which is an important fact for oil and gas exploration in China that has been widely explored for a long time. In this paper, detailed sequence division and sedimentary environment analyses of the Yan’an Formation in the Pengyang area on the southwestern margin of the Ordos Basin were conducted using field outcrops, drilling cores, logging, wavelet transform and organic geochemistry. The results showed that the succession consists of some units with distinctly different characteristics. Based on the petrographic assemblage and transform wavelet characteristics, the Yan’an Formation in this area can be divided into a long-term cycle, five medium-term cycles, and eleven short-term cycles, among which coal and carbonaceous shale were mainly developed in the short-term cycles I<sub>2</sub>, III<sub>1</sub>, III<sub>2</sub>, V<sub>1</sub> and V<sub>2</sub>. Coal and organic-rich mud shale have been developed in the Yan’an Formation and plant debris in mudstone and coal is common, indicating the development of swamps and shallow water-covered depressions in this area. The sandstones showed parallel bedding, cross-bedding and scours, thus indicating fluvial deposits. The saturated hydrocarbon gas chromatographic parameters of mud shale showed that the pristane/phytane (Pr/Ph) ratio is 2.24–6.22, the Ph/nC18 ratio is 0.15–0.93, and the Pr/nC17 ratio is 0.97–2.78, supporting the finding that the organic matter has mainly originated from terrestrial sources.https://www.mdpi.com/1996-1073/15/14/5310Ordos BasinPengyangYan’an Formationsequence classificationpeat environment |
| spellingShingle | Lianfu Hai Caixia Mu Qinghai Xu Yongliang Sun Hongrui Fan Xiangyang Xie Xiangcheng Wei Chao Mei Haibin Yu Walter Manger Jun Yang The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China Energies Ordos Basin Pengyang Yan’an Formation sequence classification peat environment |
| title | The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China |
| title_full | The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China |
| title_fullStr | The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China |
| title_full_unstemmed | The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China |
| title_short | The Sequence Stratigraphic Division and Depositional Environment of the Jurassic Yan’an Formation in the Pengyang Area, Southwestern Margin of the Ordos Basin, China |
| title_sort | sequence stratigraphic division and depositional environment of the jurassic yan an formation in the pengyang area southwestern margin of the ordos basin china |
| topic | Ordos Basin Pengyang Yan’an Formation sequence classification peat environment |
| url | https://www.mdpi.com/1996-1073/15/14/5310 |
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