利用干酪根固体~(13)C核磁共振法研究下古生界碳酸盐岩的热演化程度

应用固体~(13)C－NMR技术对下古生界,海相碳酸盐岩干酪根的化学组成和结构特征进行研究，提出应用该技术所测算的干酪根结构参数“芳核平均结构尺寸”能较准确地反映碳酸盐岩的热成熟度。首次提出芳核平均结构尺寸与镜质体反射率之间的关系在干酪根的热演化过程中具有“三段式”特征。利用这一成果对华北地区下古生界成熟度进行了测定，与地质背景甚为吻合。

SOLID ~(13)C-NMR STUDY ON THERMAL EV0LUTION MATURITY OF LOWER PALAEOZ0IC CARBONATE ROCKS

Chemical composition and structural characteristics of kerogen were studied by the solid 13CNMR techniques. The authors considered that the average dimensions of aromatic nuclear structure in kerogen, which can be measured by the approach, properly reflect the maturity of marine carbonate. The authors advanced for the first time that the relationship between average dimensions of aromatic nuclear structure and reflectivity of vitrinites can be described by the“three-stage model”during the thermal evolution of kerogen. The maturity of Lower Palaeozoic carbonate rocks in North China was measured in terms of these achievements and the results coincide with the geological backgrounds.