中上扬子五峰组页岩有机质丰度恢复及评价

Shale Organic Matter Abundance Recovery and Evaluation of Wufeng Formation in Middle-upper Yangtze

通过室内实验和理论推导,提出一种基于有机质类型和镜质体反射率的有机质丰度恢复新方法。对中上扬子五峰组高、过成熟烃源岩进行了有机质丰度恢复,五峰组页岩平均有机碳含量为7.45%,平均生烃强度为0.96 t/m2。利用有机质类型、原始有机碳含量和生烃强度对烃源岩进行综合评价,明确五峰组页岩为有机质类型好、丰度高、厚度薄、生烃强度低的中等烃源岩。为同类海相页岩气资源量估算和评价提供借鉴。

A new organic matter abundance recovery method based on organic type and vitrinite reflectance is proposed by laboratory experiments and theoretical deduction. The organic matter abundance of high and post-mature hydrocarbon source rock of Wufeng formation in middle-upper Yangtze is recovered,and the average TOC and average hydrocarbon-generating intensity are 7. 45%and 0. 96 t/m2 respectively. Organic type,original organic TOC and hydrocarbon-generating intensity are used to comprehensively evaluate hydrocarbon source rock. Shale in Wufeng formation belongs to medium hydrocarbon source rock which is featured by better organic type,high organic matter abundance,low thickness and low hydrocarbon-generating intensity. Research could provide references to resources estimation and evaluation of similar marine shales.