油页岩评价指标的含义及相互关系——以鄂尔多斯盆地三叠系延长组油页岩为例

The connotations and relationships of indexes in oil shale evaluation:a case study of the oil shale developed in Yanchang Group of Triassic,Ordos Basin

油页岩用于生产页岩油时常用含油率来评价其优劣,而在油气资源潜力评价时常用有机碳含量、生烃潜力等参数来进行评价.弄清不同参数之间的差别和相互关系具有非常重要的意义.对上述不同参数的具体含义和相关分析测定过程进行了介绍,并对鄂尔多斯盆地某钻孔的三叠系延长组油的多个参数进行了分析,这些参数的对比结果表明有机碳含量、生烃潜力、含油率三者线性正相关;鄂尔多斯盆地三叠系延长组油页岩含油率为0%～12%,多数测段的含油量为3.5%～10%,油页岩级别属于差-中等级别;只有当其有机碳含量大于7%,其才能达到工业意义上适宜提炼页岩油的标准(含油率大于3.5%).

Oil concentration is often used to ensure the grade of oil shale;however,other indexes,such as TOC and potential of hydrocarbon generation are used in evaluating oil and gas resource.It is very important to ravel the difference and the correlation among these indexes.In this paper,the connotations and the analysis process of several indexes are introduced.Moreover,15 samples of oil shale collected from Yanchang Group of Triassic,Ordos Basin,are used to conduct the analysis of these indexes.The comparison of these indexes shows that there is a linear positive correlation among oil concentration,TOC and potential of hydrocarbon generation;the oil concentration distributes in scope of 0%~12% with most in 3.5%~10% for the oil shale developed in Triassic,Ordos Basin;the oil shale belongs to normal or secondary grade and the oil shale with TOC7% will reach the threshold（Oil concentration3.5%） to render shale oil.