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通过长顺地区CY1井打屋坝组黑色岩系的元素及有机地球化学特征的综合研究,探讨了黔南地区早石炭世黑色岩系的形成环境及其油气地质意义。结果表明:研究区黑色岩系K2O和Al2O3质量分数相对较高,Mn O质量分数相对较低;Sr质量分数相对较高,其余微量元素质量分数相对较低;V/(V+Ni)、U/Th、V/Cr、Ni/Co和δU比值分布特征反映打屋坝组沉积期水体环境总体为弱氧化-弱还原环境。有机质类型为Ⅱ型,TOC质量分数平均3.5%,局部层段多小于2.0%,显示出打屋坝组黑色页岩具有较好的页岩气生烃潜力。
Through the comprehensive study on the elemental and organic geochemical characteristics of the black shale in the Dagangba Formation of CY1 well in Changshun area, the forming environment of the Early Carboniferous black rock series in the southern Qiannan area and its petroleum geological significance are discussed. The results show that the K 2 O and Al 2 O 3 mass fractions of the black rock series are relatively high and the Mn O mass fraction is relatively low; the Sr mass fraction is relatively high and the remaining trace elements mass fraction is relatively low; V / (V + Ni), U The distribution characteristics of ratio of / Th, V / Cr, Ni / Co and δU reflect the overall weakness of the water environment during the deposition of the Daba building dam. The type of organic matter is type Ⅱ, the average TOC content is 3.5%, and the partial layer fraction is less than 2.0%. It shows that the black shale in Dugangba Formation has good shale gas hydrocarbon potential.