Abstract We carried out a detailed organic facies study on shale cutting samples from the Devonian Pimenteira Formation in the Sao Luis Basin, northwest Brazil, to reconstruct the depositional paleoenvironment and origin of the organic matter. Samples were collected from the stratigraphic well 2-ANP-5-MA and were analyzed for total organic carbon (TOC), total sulfur (%S), insoluble residue (RI), spore coloration index (SCI), vitrinite reflectance (%Ro), palynofacies, and biomarkers. The TOC values of the analyzed sediments range from 0.19 to 0.51%, %S from 0.17 to 0.85%, and the total carbonate (CaCo3) is low (

中文翻译：

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巴西圣路易斯盆地泥盆系Pimenteira组沉积环境与成熟度

摘要 我们对巴西西北部圣路易斯盆地泥盆纪皮门泰拉组页岩切割样品进行了详细的有机相研究，以重建沉积古环境和有机质成因。从地层井 2-ANP-5-MA 收集样品并分析总有机碳 (TOC)、总硫 (%S)、不溶性残留物 (RI)、孢子着色指数 (SCI)、镜质反射率 (%Ro )、孢粉相和生物标志物。所分析沉积物的 TOC 值为 0.19 至 0.51%，%S 为 0.17 至 0.85%，总碳酸盐（CaCo3）较低（