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在鄂尔多斯盆地中部气田下奥陶统马五段３口井（陕参１井、陕４２井和陕１７井）２０个碳酸盐岩气源岩样品沥青“Ａ”和沥青“Ｃ”抽提物饱和烃馏分中均检测出了双金刚烷类化合物。研究发现在３．１０～３．８０ｋｍ埋深范围内，绝大多数沥青“Ａ”和沥青“Ｃ”样品的双金刚烷指标变化范围分别为５５％～６５％和４０％～５５％；在Ｒｏ值为１．９％～３．９％的变化范围内，８０％左右的沥青“Ａ”和沥青“Ｃ”样品的双金刚烷指标变化范围也分别为５５％～６５％和４０％～５５％。由于处于过成熟阶段（Ｒｏ值大于２．０％）的马五段的双金刚烷指标变化范围窄，故双金刚烷指标与岩石样品Ｒｏ值及埋深不具线性变化关系。图４表２参１（邓春萍摘）
20 carbonatite gas source rock sample bitumen “A” and bitumen “C” were extracted from 3 wells in the Lower Ordovician section Ma 5 of the central Ordos Basin (Shannian 1 well, Shaan 42 and Shaan 17 wells) The double-adamantane compounds were detected in the saturated hydrocarbon fractions. The results showed that the range of ambanadine index for most asphalt “A” and asphalt “C” samples ranged from 55% to 65% and from 40% to 55% respectively in the depth of 3.10 ~ 3.80km. Ro values ranging from 1.9% to 3.9% ranged from 55% to 65% and from 40% to 40% for the samples with about 80% asphalts “A” and “C” 55%. Because of the narrow range of bialadamanthan index in the Ma-Wu section in the over-maturity stage (Ro> 2.0%), the Shimadzu index does not have a linear relationship with the Ro value and buried depth of the rock sample. Figure 4 Table 2 Senate 1 (Deng Chunping pick)