曾母盆地东巴林坚坳陷烃源岩评价及油源探讨

Evaluation of Source Rocks and Oil-Source Correlation in East Balingian Depression of Zengmu Basin

在广泛调研前人研究的基础上,系统分析了曾母盆地东巴林坚坳陷烃源岩的分布及地球化学特征,从有机质丰度、类型和成熟度等方面对东巴林坚坳陷烃源岩进行了综合评价,结合东巴林坚坳陷部分原油与烃源岩的生标特征对比分析,探讨其对油源的贡献。结果表明,曾母盆地东巴林坚坳陷主力烃源岩为渐新统、下-中中新统煤系泥岩、海相泥页岩,其厚度大、分布广,有机质丰度较高,Ⅱ-Ⅲ型有机质,目前主要处于成熟阶段,且烃源岩质量明显受到沉积相控制。Patricia原油与煤系烃源岩生标特征具有良好的相似性,两者可能具有亲缘关系。揭示了曾母盆地巴林坚坳陷生烃潜力良好,勘探前景广阔。

Having surveyed a large number of previous studies, this paper evaluated source rocks in the east Baling- Jan depression of the Zengmu Basin by looking into abundance, type and maturity of their organic matters, and dis- cussed contributions of these source rocks by comparing the characteristics of biomarkers in the crude oil and in the source rock of the east Balingian depression. The study showed that source rocks of the east Balingian depression mainly are the Oligocene carbonaceous mudstone, coal, marine shale and the Lower-Moderate Miocene marine mudstone and coal; the source rocks have large thickness and good hydrocarbon generating conditions, and distrib- ute widely in the depress. In addition, the biomarker＇ s characteristics in the oil from Patricia is very similar to those in the coal-measure source rocks. In summary, the east Balingian depression of the Zengmu basin has good exploration prospect.