鸡西盆地下白垩统煤系烃源岩生油潜力

应用有机地球化学的多种分析方法,对鸡西盆地下白垩统烃源岩的有机岩石学特征、有机质丰度、成熟度及有机质的类型进行了讨论。有机显微组分以壳质组为主,煤岩和碳质泥岩的镜质组含量较高;有机碳、热解氢指数I_H及产烃潜量(S₁+S₂)反映烃源岩达到中等—好的级别。有机质为Ⅲ型干酪根,部分Ⅱ_B型,镜质体反射率R_o主要集中于0.5%~1.1%.依据Ⅲ型干酪根的成烃模式,正处于产生液态烃的高峰期,具备生成油气的潜力。与典型的煤成油盆地如Gippsland盆地和吐哈盆地有很好的可比性,具有很好的油气勘探前景。

Genetic Potential of Goal-Measure Source Rocks of Lower Cretaceous in Jixi Basin

The Lower Cretaceous deposits are the most important source rocks in Jixi basin of Heilongjiang province. The types of source rocks include black mudstone, coal and carbonaceous mudstone. The organic lithology, the abundance of organic matter, the maturity and the type of source rock are discussed by the methods for organic geochemical analysis. The results show that the organic micro-component of the source rocks is dominated by exinite, with high content of vitrinite in coal and carbonaceous mudstone; the values of organic carbon, IH and S1+S2 reflect that the source rock ranks medium-good one; the organic matter belongs to Type-III kerogen, partly to Type-IIB; the vitrinite reflectance ranges from 0.5% to 1.1%. According to the hydrocarbon-generating mode of Type-III kerogen, the source rocks would be just in the climax of generating liquid hydrocarbon, with oil-gas generating potentials. Also, the good comparison with typical coal-formed oil basins such as Gippsland basin and Tuha basin indicates that Jixi basin is of very good prospect for petroleum exploration.