《Table 2.Analysis data of source rock samples of Doushantuo Formation from the periphery of Sichuan

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《"Lithofacies paleogeography and exploration significance of Sinian Doushantuo depositional stage in the middle-upper Yangtze region, Sichuan Basin, SW China"》

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Doushantuo Formation is one of the major source rock strata in the southern China.The study on its distribution will be of great significance for the exploration of Sinian conventional gas，and is also of important guiding significance for the evaluation of minerals such as shale gas，phosphate ore and manganese ore.Systematic analysis of black shale and mudstone of Doushantuo Formation in outcrop profiles of Songlin of Zunyi，Xiushan of Chongqing and Chengkou in northeastern Sichuan on the periphery of Sichuan Basin（Table 2）shows that the hydrocarbon source rocks of Doushantuo Formation are mainly distributed in Z2d2，with the TOC value generally greater than 1.0%and up to 13.8%for some individual samples，indicating it is a set of high-quality hydrocarbon source rock.With average 13C kerogen of-31‰and Ro value of generally over 2.0%，it is in the high post-mature gas generation phase now.