中国海相碳酸盐岩评价中有关有机质丰度下限的几点讨论

综述了中国海相碳酸盐岩有机质下限研究的若干进展,认为针对不同需求,应提出碳酸盐岩烃源岩最低下限、有效烃源岩下限、战略选区下限3个不同的下限标准。高成熟碳酸盐岩原始有机质丰度恢复一直存在争议,根据生烃动力学,结合热史,可实现原始有机质总量的恢复。碳酸盐岩中泥质与有机质丰度、排烃能力是否相关仍存在争论,认为碳酸盐岩中泥质的作用仍有待进一步研究。

Threshold of the organic matter abundance in marine carbonate source rocks in China

This paper reviews some advances in the study of the organic matter thresholds of marine carbonate rocks in China. The authors think that for different demands there should be three different thresholds, i.e. the lowest threshold for marine carbonate source rocks, threshold for effective source rocks and threshold for strategic area selection. Reconstruction of the original organic matter abundance in high-mature marine carbonate rocks has long been in dispute. Hydrocarbon-generating kinetics, combined with the thermal history, may provide a good approach to this purpose. Whether the clay content plays an important role in the enrichment of organic matter in carbonate source rocks and expelling capacity of hydrocarbon is still in dispute. The authors think that the role of the clay content in carbonate rocks remains to be further studied.