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前人将巴参１井井深１８８２～１９７７ｍ划归下二叠统南闸组，将井深１９７７～２０９４．５ｍ划归上石炭统小海子组，经“七五”、“八五”科技攻关研究，从 化石资料，巴参１井井深１９１０～２０７５ｍ，自上而下含有Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａ，Ｔｒｉｔｉｃｉｔｅｓ带，但与之相当的巴探２井地层包括Ｔｒｉｔｉｃｉｔｅｓ，Ｆｕｓｕｌｉｎｅｌｌａ带，结合岩石地层、测井地层、地震地层、接触关系及与邻区对比，综合分析认为，巴参１井井深１８８２～２０９４．５ｍ地层归属上石炭统比较合适，并且暂时以“小海子组”作为地层单位使用。
In the past, the well depth of Well Ba-ginseng 1 was assigned to the Lower Permian South Gate Formation 1818-1977m, and the well depth of 1977-2094.5m was assigned to the Upper Carboniferous Xiaohaizi Formation. According to the scientific research of “75” and “85” From the fossil data, the depth of Well Ba-ginseng 1 is 1910 ~ 2075m, which contains Pseudoschwagerina and Triticites belt from top to bottom. However, the equivalent Phendam-2 well includes the Triticites and Fusulinella belts, combined with lithostratigraphy, well logging and seismic strata , The contact relation and the comparison with the adjacent area. According to the comprehensive analysis, the well 1842 ~ 2094.5m in the well of Ba-ginseng 1 is well-suited to the Upper Carboniferous, and is temporarily used by the “Xiaohaizi Formation” as a stratigraphic unit.