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在全球范围内，奥陶系海相地层都是重要的烃源层，且在国外研究颇多。近几年来，我国在以奥陶系为烃源层的油气勘探中取得了重要进展，如在塔里木盆地发现了一些主要源自下古生界，特别是奥陶系烃源层的油气藏。由于当时没有高等植物出现，因此奥陶系烃源岩在油气生成上与我国东部中、新生界陆相烃源岩有着明显的不同。本文通过对国内外奥陶系原油地化特征的研究，对涉及奥陶系油气生成的几个问题进行了讨论。同时希望能引起同行们对奥陶系油气生成的重视，从而使我国在台盆区的油气勘探中取得突破性的进展
Globally, the Ordovician marine strata are both important hydrocarbon sources and have been studied abroad. In recent years, significant progress has been made in the exploration of oil and gas in the Ordovician hydrocarbon source. For example, some oil and gas reservoirs mainly derived from the Lower Paleozoic, especially the Ordovician hydrocarbon source have been found in the Tarim Basin. Since there were no higher plants at that time, the Ordovician hydrocarbon source rocks were obviously different from Mesozoic and Cenozoic continental hydrocarbon source rocks in the east of China. In this paper, we discuss the geochemical characteristics of Ordovician crude oil at home and abroad and discuss some issues related to the formation of Ordovician hydrocarbon. At the same time, I hope to arouse the attention of counterparts to the Ordovician oil and gas generation, so that our country in the basin basin oil and gas exploration made a breakthrough progress