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东方Ⅰ—Ⅰ构造天然气地化特征特异,不同产层天然气组成差异甚大,但其有机烃类组成与非烃成分亦有一定规律性。天然气中有机烃类组成具混源或混合特点,均由不同成熟度的烃类混合气所组成,其干燥系数高,C_2~+重烃低,C_2~+重烃碳数宽且C_6~+烃含量较高,占C_2~+重烃的20％以上,甲烷及同系物碳同位素偏重且出现部分倒转异常,表明其烃源由邻近和深部不同成熟度烃源岩所供给。非烃气体CO_2含量及成因不同产层均有所差异,但均属壳源成因,其中,上部第一产层CO_2气为有机成因,其余产层CO_2气属岩石化学成因的无机CO_2,是产层附近岩石中碳酸盐成分的多种化学及物理的综合作用的结果。
The characteristics of natural gas from the East Ⅰ-Ⅰ structure are distinct. The compositions of the natural gas from different layers are very different, but the compositions of the organic hydrocarbons and the non-hydrocarbon components are also regular. The composition of organic hydrocarbons in natural gas is mixed or mixed, and all of them are composed of hydrocarbon mixture with different maturity. The drying coefficient is high, C_2 ~ + heavy hydrocarbon is low, C_2 ~ + heavy hydrocarbon carbon is wide and C_6 ~ + The hydrocarbon content is higher, accounting for more than 20% of the C_2 ~ + heavy hydrocarbons. The carbon isotopes of methane and its homologues are heavier and partially reversed anomalously, indicating that the hydrocarbon sources are supplied by the source rocks with different maturity near and deep. The contents and origin of non-hydrocarbon gas CO 2 are different in different layers, but all belong to the origin of the crust. Among them, the CO_2 in the upper part of the first layer is organic and the CO_2 in the remaining layers is inorganic CO_2, The result of the combined chemical and physical effects of the carbonate components in the rocks near the layers.