Thirty-seven devonian shale samples from the Barreirinha Formation were collected from the northern and southern borders of the Amazonas Basin and were geochemically analyzed to evaluate their hydrocarbon source potentials and depositional paleoenvironments and to estimate the thermal effects of igneous intrusions on kerogens. The results showed that samples from the northern border exhibited total organic carbon (TOC) and Rock Eval pyrolysis parameters that indicated excellent hydrocarbon source potential and type III kerogen. These TOC values were residual due to the intense hydrocarbon generation from heat from intrusive rocks present in that area. Samples from the southern border had poor to excellent hydrocarbon source potential and type II and III kerogens. Chromatograms of organic extracts and saturated biomarkers suggested marine anoxic to oxic and suboxic to oxic depositional paleoenvironments in the northern and southern borders, respectively^. The saturated biomarkers and stable carbon isotope ratios (δ¹³C) suggested that the original organic matter was marine with some continental contributions. The maximum pyrolysis temperature (Tmax), Spore Color Index (SCI), kerogen color, Pr/n-C₁₇ and Ph/n-C₁₈ ratios, and biomarker data indicated that the northern border shales are at the end of the oil generation window, while those from the southern border are at the beginning of the oil generation window.

从亚马逊盆地北部和南部边界收集了来自 Barreirinha 组的 37 个泥盆纪页岩样品，并对其进行了地球化学分析，以评估其烃源潜力和沉积古环境，并评估火成岩侵入对干酪根的热效应。结果表明，来自北部边界的样品显示出总有机碳 (TOC) 和 Rock Eval 热解参数，表明具有良好的烃源潜力和 III 型干酪根。由于该地区存在的侵入岩产生的热量产生强烈的碳氢化合物，因此这些 TOC 值是残留的。来自南部边界的样品具有较差到极好的烃源潜力和 II 型和 III 型干酪根。^. 饱和的生物标志物和稳定的碳同位素比 (δ13C) 表明原始有机质是海洋，有一些大陆贡献。最高热解温度（Tmax）、孢子颜色指数（SCI）、干酪根颜色、Pr/nC ₁₇和Ph/nC ₁₈比值以及生物标志物数据表明北部边界页岩处于生油窗口的末端，而那些从南部边界开始的石油生产窗口。