陕北斜坡东部上古生界山西组烃源岩评价

Evaluation of Source Rocks of Shanxi Formation of Upper Paleozoic in the East of the North Shaanxi Slope

陕北斜坡东部上古生界山西组烃源岩有泥岩型和煤岩型两种。为了能够准确地评价研究区两种烃源岩的优劣,本次研究进行了较为全面的烃源岩样品选取和分析化验工作,并从有机质丰度、有机质类型和有机质成熟度三个方面对烃源岩进行综合研究。结果表明,山西组暗色泥岩样品总体已属于烃源岩范畴,其中烃源岩主要以中等-好级别为主,有机质类型为Ⅱ2型和Ⅲ型,处于高成熟-过成熟生气阶段;山西组煤系烃源岩为较差烃源岩,有机质类型为Ⅲ型,处于过成熟生气阶段。

The source rocks of Shanxi formation of upper Paleozoic in the East of North Shaanxi Slope include mudstone type and coal rock type. In order to accurately evaluate the quality of the two kinds of hydrocarbon source rocks in the study area, sampling and analysis of hydrocarbon source rocks were carry out, and hydrocarbon source rock samples were comprehensively studied from three aspects of organic matter abundance, organic matter type and organic matter maturity. The results show that, the dark mudstone sample of Shanxi formation generally belongs to the category of hydrocarbon source rock. The hydrocarbon source rocks is mainly in the middle- high level with high mature-over mature stage, and its organic matter types are II 2 and III. Coal measure source rock of Shanxi formation is poor in the mature stage and its organic matter type is III.