沁水盆地新近纪张村组油页岩评价及古环境分析

为了深入分析油页岩发育特征对古环境的指示作用，为油页岩资源评价提供理论指导，选取沁水盆地中部新近系张村组油页岩为研究对象，采用岩石热解、有机碳测定、X射线荧光光谱仪（XRF）测试等方法分析油页岩有机地球学和元素地球化学特征，探讨沉积期的古气候和古地理环境。结果表明，张村组油页岩含油率较低，为4.15%；干酪根类型为标准腐泥型（I₁），埋藏较浅，生烃潜力较高；样品的微量元素富集指数和地球化学参数特征显示，张村组油页岩有机质为混合来源，湖泊自身生产力提供主要物质基础；沉积期气候温暖湿润，盆地内水体由盐湖逐渐淡化，油页岩形成于水体分层不强的厌氧、深湖环境。油页岩的地球化学特征与沉积期的古气候、古地理环境具有较好耦合性。 

Evaluation and analysis of paleoenvironments of the Neogene oil shale of Zhangcun Formation,Qinshui basin

In order to deeply analyze the indication of oil shale development characteristics on paleoenvironments and provide theoretical guidance for oil shale resource evaluation, the organic geochemistry and elemental geochemistry characteristics of the Neogene Zhangcun Formation oil shale in the central part of the Qinshui basin were analyzed by Rock-Eval and TOC and the paleoclimate and paleogeographic environments of the depositional period were discussed as well. The results show that the oil shale of Zhangcun Formation has the low oil content which Tar=4.15%, higher hydrocarbon potential, kerogen is of sapropel type(I₁), which has relatively shallow burial depth. The element enrichment coefficients indexes indicated that the source of organic matters are a mixed source, but productivity of lakes provided major material for oil shale. The climate was warm and humid during the depositional period, and the water in the basin was gradually desalted from salt lake, while the oil shale was formed in an anaerobic and deep lake environment with weak stratification. The geochemical characteristics of oil shale are well coupled with the palaeoclimate and palaeogeographical environments.