准噶尔盆地石炭系高-过成熟烃源岩有机质丰度恢复研究新进展

Restoration of Organic Abundance for High-over Mature Source Rocks of Carboniferous in Junggar Basin

针对准噶尔盆地石炭系露头样品有机质丰度低、成熟度高的现状,应用降解率法,探讨高-过成熟烃源岩有机质丰度恢复。结果表明,有机质丰度恢复取决于有机质类型,石炭系烃源岩有机质以Ⅱ型和Ⅲ型为主,也有部分Ⅰ型。不同类型烃源岩有机碳恢复系数存在差异,Ⅰ型、Ⅱ型、Ⅲ型有机质的原始有机碳恢复系数分别为2.45、1.42、1.04。有机质类型为Ⅰ型和Ⅱ型的烃源岩,进行恢复前后的有机碳及生烃潜量变化显著,烃源岩评价等级也显著提升,而有机质类型为Ⅲ型的烃源岩无论是有机碳还是生烃潜量变化却不大。

According to Carboniferous outcrop samples in Junggar Basin with the low abundance and high maturity of organic matter, we study restoration on organic matter abundance of high-over mature source rocks through degradation ration method. The results show that restoration on organic matter abundance depends on the type of organic matters, which is dominated by type 1I and 11I, partly type I .Organic carbon restoration coefficient of type I, II and IH is respec- tively 2.45,1.42 and 1.04. Organic matter abundance and hydrocarbon-generating potential for I and Ⅱ type of organic matter varies significantly ,which results in the promotion of evaluation grade for source rocks, while III type of organic matter is not significant with increasing maturity.