Natural Gas Exploration and Development

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Geochemical characteristics and sedimentary environment in source rocks of Doushantuo Formation, northern Sichuan Basin

DENG Jian, DU Chongjiao, ZHANG Lei, LIU Xu, LI Longlong

Natural Gas Exploration and Development, 2025, 48(3): 1-13. DOI: 10.12055/gaskk.issn.1673-3177.2025.03.001

Fig. 1 Geographic location of northern Sichuan Basin and synthetic histogram of Sinian strata in northern basin

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Fig. 2 Cross-well of Doushantuo Formation individually in Qingping town of Mianzhu city, Yangpingguan town of Ningqiang county, Fucheng town of Nanzheng county, Xiaoyangba village of Zhenba county, and Gaoyan town of Chengkou county
Fig. 3 Sedimentary characteristics of Doushantuo Formation in northern Sichuan Basin
Fig. 4 Maceral characteristics of kerogen among shale in Doushantuo Formation, northern Sichuan Basin
Table 1 Organic geochemical characteristics in source rocks of the Sinian Doushantuo Formation, northern Sichuan Basin
Fig. 5 Crossplots of elemental ratio in shale of Doushantuo Formation, northern Sichuan Basin (the data for Zhangcunping, Huajipo and Chengkou from Ref. 24)
Fig. 6 A crossplot of Mo_EF and U_EF in shale of Doushantuo Formation, northern Sichuan Basin (base map from Ref. 23)
Fig. 7 A chart to discriminate Ni-Co-Zn sedimentary setting in Doushantuo Formation, northern Sichuan Basin (modified from Ref. 30, and some data from Ref. 31)
Fig. 8 PAAS normalized dispersion of REEs in samples from Doushantuo Formation, northern Sichuan Basin
Table 2 Characteristics of trace elements in Doushantuo Formation, northern Sichuan Basin
Fig. 9 A crossplot of TOC and Ba in shale of Doushantuo Formation, northern Sichuan Basin
Fig. 10 Paleogeography of the Sinian Doushantuo Formation in Sichuan Basin and its periphery
Fig. 11 Crossplots of TOC and δEu as well as TOC and Mo_EF in shale of Doushantuo Formation, northern Sichuan Basin

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