中文摘要：

甲基双金刚烷化合物可用于镜质体反射率R在1．0％-2．0％间的原油及烃源岩成熟度的研究，在该成熟度范围内甲基双金刚烷成熟度指标与镜质体反射率之间具有良好的线性关系。对甲基双金刚烷成熟度指标研究成果的分析表明，甲基双金刚烷成熟度指标与镜质体反射率的线性关系明显受烃源岩岩性的影响，对于碳酸盐岩和泥岩，它们的线性关系有较大差别；对于不同地区碳酸盐岩，它们的线性关系十分接近，但对于不同地区泥岩，它们的线性关系则差别较大。资料反映甲基双金刚烷成熟度指标适合用于中-高成熟度原油的成熟度研究，应用范围的Ro下限值为1．0％-1．3％，Ro上限值为2．0％。运用甲基双金刚烷成熟度指标对珠江口盆地番禺低隆起地区轻质原油成熟度的研究表明，该地区轻质原油为高成熟度原油，Ro值在1．3％以上。

英文摘要：

The methyl double diamondoid hydrocarbons can be used to study the crude oil and source rock maturities （Ro = 1.0 %-2.0 %） of the high thermal evolution because there is a good relationship between the methyl double diamantane indicator （IMD） and vitrinite reflectance （Ro） based on the analysis of the diamantane index from carbonate and mudstone source rocks. However,the relationship between the diamantane index and Rois affected by the lithology of the source rocks. The existence of various linear relationships of the carbonate and the mudstone can be found from the data provided in this paper. Also the distinction of the linear relationships is observed in mudstone source rocks from the different areas. This linear relationship of carbonate source rocks from variant basins is noted to be generally alike. The application and influence factors of the diamantane indicator （IMD） for explanation of the maturities of the high thermal evaluated oils and source rocks are discussed in detail. Basically the application ranges for the low- er limit of Rofrom 1.0%-1.3% ,and the upper limit to 2.0%. Using the data of methyl double diamondoid maturity indicator of the light crude oils on the Panyu lower uplift of Pearl River Mouth Basin are studied in the paper. The study indicates that the light crude oils are regarded as the source rocks of high maturity phase in the Baiyun Depression of the basin, with the maturity Ro of the light crude oils over 1.3 %.