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在对内蒙古索伦地区中二叠统哲斯组岩性特征、沉积环境和暗色泥岩油气地球化学特征研究的基础上,总结了烃源岩的有机质丰度、干酪根类型和热演化的特征。暗色泥岩累积厚度达640m。总有机碳(TOC)的含量在0.38%~1.78%之间,TOC大于0.6%的样品占98%。有机质类型为Ⅱ~Ⅲ型。Tmax在354~548℃之间,Ro平均值3.24%,表明干酪根演化进入高—过成熟阶段。研究中还发现,S1+S2(<0.2mg/g)和IH(<16mg/g.c)都很低。造成上述结果的原因是,烃源岩已经经历过极高的热演化和排烃过程,排烃发生在晚二叠世和早白垩世晚期。
Based on the study of the lithologic features, sedimentary environment and the geochemical characteristics of dark mudstone in the Middle Permian Czessi Formation in the Solon area, Inner Mongolia, the characteristics of organic abundance, kerogen type and thermal evolution of source rocks are summarized. Dark mudstone has a cumulative thickness of 640m. Total organic carbon (TOC) was between 0.38% and 1.78%, and samples with TOC greater than 0.6% accounted for 98%. Organic matter type Ⅱ ~ Ⅲ type. The Tmax ranged from 354 to 548 ° C, and the Ro averaged 3.24%, indicating that the evolution of kerogen entered the high-overripe stage. The study also found that both S1 + S2 (<0.2 mg / g) and IH (<16 mg / g.c) were low. The reason for the above results is that the hydrocarbon source rocks have undergone extremely high thermal evolution and hydrocarbon expulsion processes and hydrocarbon expulsion occurred in the Late Permian and Early Cretaceous.